ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • Polymer and Materials Science  (112.478)
  • Analytical Chemistry and Spectroscopy  (25.033)
Sammlung
Schlagwörter
Verlag/Herausgeber
Erscheinungszeitraum
  • 1
    Digitale Medien
    Digitale Medien
    Preparation of monodisperse reactive styrene-glycidyl methacrylate latexes by the emulsifier-free dispersion copolymerization technique (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 2949-2960 
    Details
    ISSN: 0360-6376
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Latexes based on styrene-glycidyl methacrylate copolymers were prepared by the emulsifier-free dispersion copolymerization technique. The main factors affecting the size and morphology of the latex particles and their distribution are the initiator concentration (K2S2O8), the total ionic strength of the aqueous phase, and the total monomer concentration. The existence of critical values for these variables was demonstrated. In the range in which these factors had values below the critical, the synthesized latex particles were spherical, homogeneous, and in varied sizes, depending on the abovementioned parameters in the range of 220-500 nm. Above the critical values of these variables the latex particles consisted of spherical aggregates of smaller particles. The reactive oxirane groups of the latex particles were modified later by hydrolysis, ammonolysis, reaction with Na2S, or periodic acid oxidation of the hydrolyzed or ammonolyzed forms of the latex particles.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1983.170211011
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Structure-property relationships in polyurethane-poly(styrene-co-acrylonitrile) blends (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 50 (1993), S. 719-727 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Blends of Thermoplastic polyurethane (TPU) and poly(styrene-co-acrylonitrile) (SAN) (34% acrylonitrile and 24% acrylonitrile) and polyurethane ionomer (PUI) with SAN (34% acrylonitrile) were prepared in the melt. The structural properties and morphology of the blends were investigated. TPU and SAN blends were immiscible in the composition range 30-70 wt % of TPU or SAN. In TPU-rich blends, SAN propagates the separation of hard and soft segements in TPU. In SAN-rich blends, the interaction stage depends on acrylonitrile contents. SEM measurements showed that the blends of TPU/SAN were fine dispersions and clearly showed a continuous and disperse phase, whereas the morphology of the PUI/SAN blends were different. © 1993 John Wiley & Sons, Inc.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1993.070500418
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Isotope and pressure effects in polymer solutions. Demixing of polystyrene(h/d) poly-2-chlorostyrene blends (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 33 (1995), S. 595-602 
    Details
    ISSN: 0887-6266
    Schlagwort(e): demixing ; spinodal quench ; polymer blends ; lower critical solution temperature ; isotope effect ; pressure dependence ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Liquid-liquid demixing, following spinodal quenches of poly-2-chlorostyrene/polystyrene blends, was followed by light scattering at 632.8 nm. The dependences of demixing on H/D substitution and molecular weight of the polystyrene, and on pressure, are reported. In the region of interest, the phase diagram is of the lower critical solution (LCS) type, and demixing is induced by raising the temperature. The transition temperature is lowered by deuterium substitution. At constant quench depth the transition proceeds more rapidly at elevated pressure. © 1995 John Wiley & Sons, Inc.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/polb.1995.090330409
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    Vibrational dephasing of the ν3 mode of liquid allene (1986)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 17 (1986), S. 477-480 
    Details
    ISSN: 0377-0486
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The Raman spectrum of the ν3 mode of allene has been studied as a function of temperature throughout the temperature range of the liquid. Analysis of the spectral band shape shows that the vibrational dephasing is a fast-modulation process. Evidence is presented for a vibrational-rotational coupling involving the tumbling reorientation of the molecule. Dilution studies in GeH4 indicated significant resonant vibrational energy transfer.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jrs.1250170610
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    Quasi-perfect polar alignment of nonlinear chromophores in a crystalline H-bonded guest-host structure: 2-Amino-5-nitropyridinium-L-monohydrogentartrateThe authors are grateful to Drs. R. Hierle and D. Josse for SHG powder tests performed at “Département d'Electronique Quantique et Moléculaire”, C.N.E.T. One of us (J. Z.) gratefully acknowledges a Meyerhof Visiting Professorship from the Weizmann institute of Science, 76100 Rehovot, Israel. Full details of the reported crystal structure can be obtained from the Cambridge Crystallographic Data Center, on quoting the journal citation. (1993)
    Weinheim : Wiley-Blackwell
    Advanced Materials 5 (1993), S. 120-124 
    Details
    ISSN: 0935-9648
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/adma.19930050210
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 6
    Digitale Medien
    Digitale Medien
    Degradation on freezing dilute polystyrene solutions in p-xylene (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 1257-1269 
    Details
    ISSN: 0887-6266
    Schlagwort(e): polystyrene solutions in p-xylene ; crystallization-induced degradation ; polymer molecular weight dependence ; scission probability distribution function ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Chain scission was observed during the crystallization of p-xylene in dilute polystyrene solutions. Degradation yields were determined by gel permeation chromatography, as a function of the number of freeze-and-thaw cycles, polymer concentration, and initial polymer molecular weight (M). The rate constant for chain scission Kc increases with the polymer chain length, from 0.021%/cycle at M = 110·103 to 4.7%/cycle at M = 8.5·106. Over the two decades range of investigated molecular weights, Kc follows an empirical scaling law of the form Kc ∼ (M - Mlim)1.17578, where Mlim is a limiting molecular weight ≅ 29,000 g. mol-1 below which no degradation could be induced. Some propensity for midchain scission was detected, although this tendency was much weaker in comparison to flow-induced degradation.A chain scission model based on crack propagation failed to reproduce the experimental results. To explain the observed dependence of Kc with the square of the radius of gyration, an interfacial stress transmission mechanism between the crystallization fronts and the polymer coil has been proposed. © 1994 John Wiley & Sons, Inc.
    Zusätzliches Material: 13 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/polb.1994.090320713
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 7
    Digitale Medien
    Digitale Medien
    Determination of benzene alkyl derivatives in heavily loaded environmental aqueous samples by means of combination of distillation and purge and trap-gas chromatography-mass spectrometry (1997)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 20 (1997), S. 482-486 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Volatile benzene alkyl derivatives ; Simple distillation ; Purge and trap ; Capillary gas chromatograph-mass spectrometry ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Simple distillation was used to prepare aqueous environmental samples (especially those with high content of accompanying dissolved and suspended organic and inorganic matter) for determination of benzene, toluene, ethylbenzene, and xylenes (BTEX) by means of purge and trap (PT) coupled to gas chromatography-mass spectrometry (GC-MS). The PT step was carried out with a laboratory-built device in which alalytes desorbed from a Primary trap (macrotrap) are focused in a microtrap (also with sorbent) and moisture is removed from purge gases by a Nafion tube (walls selectively permeable to water vapor). Recoveries, if only the first 10 ml distillate was collected, were of the order of 40% at optimum distillation parameters. At a probability level of 95% recoveries were independent of concentration in a studied concentration range of 0.50-30 ppb. Enrichment factors for distillation were of the order off 20. Real samples, i.e., raw and treated waste water were analyzedc for BTEX content by the developed medthod.
    Zusätzliches Material: 5 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240200904
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 8
    Digitale Medien
    Digitale Medien
    The Detonation Properties of Explosive-Water Mixtures (1982)
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 7 (1982), S. 107-109 
    Details
    ISSN: 0721-3115
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Mixtures of crystalline explosive and water have as a rule detonation properties different from the dry material. It has been shown that the character of those changes is closely related to the structure of the particles (crystals, granules) of the explosives. The critical diameters and detonation velocities have been measured for a range of explosive-water mixtures, and the results are interpreted in terms of the hotspot theory.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prep.19820070406
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 9
    Digitale Medien
    Digitale Medien
    Eine Labor-Druckapparatur und ihre Nutzung für Untersuchungen zur thermischen Spaltung von 1,2-Dichlorethan (1994)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 66 (1994), S. 197-201 
    Details
    ISSN: 0009-286X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cite.330660211
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 10
    Digitale Medien
    Digitale Medien
    Zur Beeinflussung der Koksbildung bei der 1,2-Dichlorethan-Pyrolyse durch Eisen(II)-chlorid (1995)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 67 (1995), S. 1346-1349 
    Details
    ISSN: 0009-286X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cite.330671019
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 11
    Digitale Medien
    Digitale Medien
    Werkstoffanstrengung bei Wälzbeanspruchung - Einfluß von Reibung und Eigenspannungen (1980)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 11 (1980), S. 1-14 
    Details
    ISSN: 0933-5137
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Material Stressing under Rolling Contact - Influence of Friction and Residual StressesMaterial stressing of parts in rolling contact is in the main made up by the normal load to be transmitted, by surface friction due to slippage of the body in rolling contact and by residual stresses. The effects of varying slippage rates are described as well as the additional influence of residual stresses on magnitude, position and direction of load.By the aid of mere mechanical reflections the formation of flat and steep White Bands can be interpreted which are observed in long-lived ball bearings subjected to high stresses. The report shows that residual stresses and friction must not be neglected when describing the material stressing by rolling contact. This especially applies to residual stresses originating from rolling contact.
    Notizen: Die Werkstoffanstrengung bei Wälzkontakt ist im wesentlichen gegeben durch die zu übertragenden Normalkräfte, die Reibung an der Oberfläche (durch das Gleiten der beiden Wälzpartner) und durch die Eigenspannungen. Die Wirkung unterschiedlich großer Gleitanteile wird dargestellt und der zusätzliche Einfluß von Eigenspannungen auf die Höhe, Lage und Richtung der Beanspruchung ausgewiesen.Anhand rein mechanischer Betrachtungen läßt sich die Entstehung von flachen und steilen Weißen Bändern deuten, die in langlebigen, hochbeanspruchten Kugellagern beobachtet werden. Der Bericht zeigt, daß Eigenspannungen und Reibung keinesfalls bei der Beschreibung der Werkstoffanstrengung durch Wälzbeanspruchung vernachlässigt werden dürfen. Dies gilt insbesondere auch für die Eigenspannungen, die durch die Wälzbeanspruchung entstehen.
    Zusätzliches Material: 27 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mawe.19800110104
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 12
    Digitale Medien
    Digitale Medien
    Die Beeinflussung der mechanischen Eigenschaften von gehärtetem Wälzlagerstahl 100 Cr6 durch hydrostatischen Druck (1977)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 8 (1977), S. 344-353 
    Details
    ISSN: 0933-5137
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: The Influence of Hydrostatic Pressure on the Mechanical Properties of Hardened Rolling Bearing Steel 100 Cr6The paper describes the influence of hydrostatic pressure on the mechanical properties of differently heat-treated rolling bearing steel 100Cr6 based on the triaxial stressing in elements in rolling contact. It is illustrated that hydrostatic pressure superposed on tension changes the data of the tension test depending on the state of the material. While the yield point is not influenced by the pressure, the resistance to fracture and the ductility considerably increase under pressure the increase under pressure being dependent on the heat treatment. The test results show that an optimum adjustment of the heat treatment is possible only if the test conditions reflect the real field conditions. Finally, the applicability of some of the results to the behaviour of material in rolling contact is discussed.
    Notizen: Ausgehend von der mehrachsigen Beanspruchung in Wälzelementen durch den Überrollungsvorgang wird der Einfluß eines hydrostatischen Druckes auf die mechanischen Eigenschaften des unterschiedlich gehärteten Wälzlagerstahls 100Cr6 beschrieben. Es wird gezeigt, daß ein dem Zugversuch überlagerter Druck die Kenngrößen des Zugversuches je nach vorliegendem Werkstoffzustand unterschiedlich verändert. Während die Elastizitätsgrenze vom Druck unabhängig ist, steigen Bruchfestigkeit und plastische Verformbarkeit unter Druck erheblich an, wobei die Zunahme dieser Größen durch den Druck von der Wärmebehandlung abhängt. Die Versuchsergebnisse belegen, daß eine exakte Optimierung der Wärmebehandlung nur unter wirklichkeitsgleichen Versuchsbedingungen möglich ist. Abschließend wird versucht, einige der ermittelten Ergebnisse auf das Verhalten des Werkstoffs bei der Wälzbeanspruchung zu übertragen.
    Zusätzliches Material: 18 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mawe.19770081008
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 13
    Digitale Medien
    Digitale Medien
    An energy-resolved study of the fragmentation of ionized 1-Penten-3-ol (1984)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 19 (1984), S. 573-576 
    Details
    ISSN: 0030-493X
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A detailed energy-resolved study of the fragmentation of CH2=CHCH(OH)CD2CD3 (1-d5) has been carried out using metastable ion studies and charge exchange techniques, combined with collision-induced dissociation studies to establish the structures of fragment ions. At low internal energies (metastable ions) the molecular ion of 1-d5 rearranges to the 3-pentanone structure and fragments by loss of C2H5 or C2D5 leading to the acyl structure, [CH3CH2C≡O]+ or [CD3CD2C≡O]+, for the fragment ion. However, with increasing internal energy of the molecular ion this rearrangement process decreases rapidly in importance and loss of C2D5 by direct cleavage, leading to [CH2=CHCH=OH]+, becomes the dominant fragmentation reaction. As a result the [C3H5O]+ ion seen in the electron impact mass spectrum of 1-penten-3-ol has predominantly the protonated acrolein structure.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/oms.1210191109
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 14
    Digitale Medien
    Digitale Medien
    Negative ion field desorption mass spectrometry by clustering with anions (1981)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 8 (1981), S. 312-315 
    Details
    ISSN: 1052-9306
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: It is shown that under field desorption conditions some less volatile or non-volatile compounds such as oligosaccharides, sulphonic acids and fatty acids can be ionized below the threshold of field electron emission by clustering with anions. In all cases the sample, together with polyethylene oxide 4000, is dissolved in water. The source of the clustering anion is provided either by a small amount of a salt added to this solution (sugars) or by the compounds themselves (sulphonic and fatty acids). The solution is applied to unactivated and/or slightly activated 10 μm tungsten wire cathodes. Suitable clustering ions for the sugars appear to be [Cl]-, [NO3]- and to a lesser extent [Br]- and [I]-. Most of the sulphonic acids studied give rise to the formation of [Mn - H]- ions (n≤5), but their potassium salts yield only unclustered sulphonate anions. However, the addition of a small amount of LiCl to the mixture of benzene sulphonic acid and polyethylene oxide 4000 promotes the formation of clustered anions, [(M - H)2Li]- being by far the most abundant if activated cathodes are used. This addition of some LiCl is essential in the case of fatty acids: without LiCl no anions may be desorbed at all from activated wires, but with the presence of LiCl both [M - H]- and the most abundant [(M - H)2Li]- anions are easily generated.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200080706
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 15
    Digitale Medien
    Digitale Medien
    A 15N labelling, FD and FAB study of ammonia loss from protonated arginine molecules (1983)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 18 (1983), S. 525-529 
    Details
    ISSN: 0030-493X
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The positive ion field desorption (FD) spectrum of arginine taken at the best anode temperature only contains a peak due to [M+H]+ ions. At higher emitter temperatures a considerable amount of fragmentation is induced and the [M+H—NH3]+ ions become most abundant. Specific 15N labelling reveals that the eliminated ammonia molecule, exclusively, contains one of the terminal nitrogen atoms of the guanidyl group. This also applies to the ammonia loss from metastably decomposing [M+H]+ ions. The positive ion fast atom bombardment (FAB) spectrum shows more fragmentation than the FD spectrum. In contrast with the FD results, the [M+H]+ ions generated upon FAB with ion lifetimes 〈10-6 s eliminate both ammonia containing one of the terminal nitrogen atoms of the guanidyl group and ammonia containing the α-amino group in the ratio of 1.35, as found by 15N labelling. The metastably decomposing [M+H]+ ions, however, eliminate only the former ammonia molecule. In the negative ion FD and FAB spectra no other peak than that corresponding to the [M—H]- ion is observed. Some attention has been paid to the thermal degradation of arginine on the basis of a few Curie-point pyrolysis experiments.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/oms.1210181206
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 16
    Digitale Medien
    Digitale Medien
    Qualitative und quantitative mikroskopische Untersuchungsverfahren in der Metallkunde. Hrsg. von H. Freund, 472 S., 266 Abb., 16 Tab. Umschau-Verlag, Frankfurt a. M. (1969), 16 × 23,5 cm, Ganzleinen DM 148,- (1970)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 21 (1970), S. 247-247 
    Details
    ISSN: 0947-5117
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/maco.19700210319
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 17
    Digitale Medien
    Digitale Medien
    Metall unter dem Mikroskop - Einführung in die metallographische Gefügelehre. Von E. Kauczor. 3. verbesserte und erweiterte Auflage. Heft 121 aus der Reihe der Werkstattbücher. Berlin, Heidelberg, New York. Springer-Verlag 1969. 69 S., 124 Abb., 8°, geheftet DM 7,50 (1972)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 23 (1972), S. 335-335 
    Details
    ISSN: 0947-5117
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/maco.19720230422
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 18
    Digitale Medien
    Digitale Medien
    Longitudinal growth of polymer crystals from flowing solutions. IV. The mechanical properties of fibrillar polyethylene crystals (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 14 (1976), S. 339-346 
    Details
    ISSN: 0360-6384
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1976.130140605
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 19
    Digitale Medien
    Digitale Medien
    On the possibility of Detecting Case/Liner and Liner/Propellant Debonds in a Rocket Motor by means of the ultrasonic multiple reflection pulse echo technique (1983)
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 8 (1983), S. 40-45 
    Details
    ISSN: 0721-3115
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: In order to examine whether and to what extent the ultrasonic multiple reflection technique can be used for detecting case/liner and liner/propellant debonds, measurements were performed on samples sawn from a particular case-bonded rocket motor consisting of a layer of 2.4 mm steel, a layer of 1,3 mm liner material (a polymer) and a thick layer of composite (AP/PU) propellant respectively. It was found that case/liner debonds could be traced reasonably well; liner/propellant debonds, however, could not be evidenced owing to strong quenching of the ultrasound in the liner. Investigations of the texture of the liner material with the aid of a scanning electron microscope proved the strong quenching in the liner to be mainly due to the presence of many voids with diameters of some 50 μm-200 μm which strongly disperse the sound beam.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prep.19830080203
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 20
    Digitale Medien
    Digitale Medien
    Biodegradation of Pharmaceutical Residues Investigated by SPE-GC/ITD-MS and On-Line Derivatization (2000)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 23 (2000), S. 474-478 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Solid-phase extraction, on-line derivatization, and measurement by ion trap mass spectrometry (ITD-MS) were used to investigate the biological degradation of pharmaceutical residues (clofibric acid, ibuprofen, diclofenac). The results of the single steps of sample pretreatment and analytical determination are reported. MS/MS measurements were performed on an ITD-MS by selecting collision induced dissociation of the molecular ions (M+) as parent ions to defined daughter ions. A pilot sewage plant and biofilm reactors operating under oxic and anoxic conditions were run as model systems with synthetic sewage water containing 10 to 50 mg/L dissolved organic carbon (DOC) and pharmaceuticals in concentrations of 10 μg/L. Clofibric acid displayed its persistent character in all cases. The pilot sewage plant and the oxic biofilm reactor showed comparable results for diclofenac and ibuprofen, which both were partly degraded. These results can explain the occurrence of these substances in sewage effluents and in the aquatic environment. A high degree of degradation was found especially for ibuprofen in the oxic biofilm reactor, which was attributed to adaptation of the biofilm to the residue. Two metabolites of ibuprofen could be identified on the basis of their mass spectra and comparison with literature data, viz. hydroxyibuprofen and carboxyibuprofen.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
  • 21
    Digitale Medien
    Digitale Medien
    124. Stoffübergang in Festbetten bei der Extraktion mit überkritischem Kohlendioxid (1993)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 1128-1128 
    Details
    ISSN: 0009-286X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cite.3306509126
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 22
    Digitale Medien
    Digitale Medien
    Einfluß des Gefügezustandes auf die mechanischen Eigenschaften von (α + β)- TitanlegierungenVortrag gehalten auf dem Werkstoff-Symposium „Titanlegierungen am 18.2.77, Ruhr-Universität Bochum, Institut für Werkstoffe (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 56-62 
    Details
    ISSN: 0933-5137
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Influence of Microstructure on Mechanical Properties of (α + β)-Ti-AlloysThe amount of α- and β-phase in (α + β)-Titanium alloys for example in the alloy TiAl6 V4 may be altered to a large extend by annealing procedures. In the alloy TiAl6 V4 each temperature corresponds to a certain amount of each of these phases, the composition of which is also dependent on annealing temperature. Above about 970 °C the homogeneous β-phase appears. Additions of Iron, Oxygen, Nitrogen and Hydrogen have a great influence on the transition temperature and the distribution of the α- and β-phase. There is a great influence of the distribution of the phases on the mechanical properties. The β-phase and the α-solid solution can be quenched from high temperature and decomposed at a lower temperature, so that intermediate phases as ω from β and α2 from α may be precipitated. The α-solid solution is anisotropic so that texturized samples have different properties in various directions. Based on these fundamental aspects it is shown to what extend these microstructures may influence the mechanical properties especially the fatigue behaviour of (α + β)-Ti-alloys.
    Notizen: Die Anteile des α- und β-Titanmischkristalls in (α + β)-Titanlegierungen können z. B. bei der Legierung TiAl6 V4 in großen Bereichen durch Wärmebehandlung variiert werden. Bei jeder Temperatur stellt sich z. B. bei TiAl6 V4 ein bestimmtes Verhältnis zwischen α und β ein, wobei sich die Legierungskonzentration in den einzelnen Phasenanteilen ändert, bis oberhalb etwa 970 °C die reine β-Phase vorliegt. Beimengungen wie Eisen, Sauerstoff, Stickstoff und Wasserstoff verändern die Umwandlungstemperatur und auch die Anteile der jeweiligen Phasen. Die mechanischen Eigenschaften werden durch das Gefüge entscheidend beeinflußt. Sowohl der β-Mischkristall wie auch der α-Mischkristall können von hoher Temperatur abgeschreckt und bei tiefen Temperaturen zum Zerfall gebracht werden, so daß dadurch weitere Zwischenphasen, wie die ω-Phase im β-Mischkristall und die α2-Phase im α-Mischkristall ausgeschieden werden. Der α-Mischkristall weist eine starke Anisotropie auf, so daß mit Textur behaftete Proben eine Richtungsabhängigkeit der mechanischen Eigenschaften aufweisen. Ausgehend von diesen Grundlagen wird gezeigt, wie sich diese Gefügezustände auf die mechanischen Eigenschaften insbesondere bei schwingender Beanspruchung auswirken.
    Zusätzliches Material: 22 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mawe.19780090205
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 23
    Digitale Medien
    Digitale Medien
    Wasserstoffversprödung von Titan und Titanlegierungen (1974)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 5 (1974), S. 233-241 
    Details
    ISSN: 0933-5137
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Hydrogen-embrittlement of Titanium and Titanium-Alloys. The influence of hydrogen-embrittlement on mechanical properties, especially on plastic deformation of titanium and its alloys is described. Even less than 200 ppm H may result in embrittlement. Titanium is sensitive to hydrogen-embrittlement at high speed of deformation; titanium-alloys in a notched condition at low speed of deformation. Hydrogen dissolution can be avoided or diminished by thin oxide layers. The connection between hydrogen-embrittlement and stresscorrosion-cracking is shown on different examples. Alloys with high content of aluminium are most sensitive against this sort of embrittlement.
    Notizen: Der Einfluß einer Wasserstoffversprödung auf die mechanischen Eigenschaften, insbesondere die plastische Verformung von Titan und seinen Legierungen werden beschrieben. Bereits geringe Anteile von Wasserstoff in der Größenordnung von ≦ 200 ppm können sich ungünstig auswirken. Titan ist bei einer hohen Verformungsgeschwindigkeit und Titanlegierungen sind bei einer niedrigen Verformungsgeschwindigkeit insbesondere im gekerbten Zustand empfindlich gegen die Wasserstoffversprödung. Durch dünne Oxidschichten kann die Wasserstoffaufnahme verhindert oder vermindert werden. An verschiedenen Beispielen wird der enge Zusammenhang zwischen Wasserstoffversprödung und Spannungsrißkorrosion aufgezeigt. Legierungen mit hohen Gehalten an Aluminium sind besonders empfindlich gegen diese Art der Versprödung.
    Zusätzliches Material: 24 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mawe.19740050502
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 24
    Digitale Medien
    Digitale Medien
    Untersuchung der Einwirkung einer Reaktionsdiffusion und Versprödung auf die Rißbildung von Titanlegierungen bei erhöhter Temperatur (1968)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 19 (1968), S. 905-909 
    Details
    ISSN: 0947-5117
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Influence of surface reaction diffusion at high temperatures on the formation of brittle fractures in titanium alloysHeat resistant titanium alloys, which in almost all cases contain aluminium as an additional element, exhibit a tendency to brittle fractures at high temperatures, whereby the optimum elongation of the samples decreases with a longer experimental time. Examinations of the alloys TiAl5Sn2, 5, TiAl6V4, TiAl7Mo4 and TiAl9V3 with help of scanning electron probe microanalysis have shown that aluminium, as a consequences of reaction with the atmosphere becomes enriched at the surface. Because of teh enrichment of aluminium a super lattice of the a-solid solution is formed, which exhibits a different deformation mechanism from the a-solid solution free from super lattice Diffusion of the aluminium occus mainly along the grain boundaries, which also causes these to be enriched with aluminium and has an inclination to be brittle. In allosy exhibiting a polygonal grain the fractures due to brittleness are intercrystalline because of the aluminium enrichment. If the alloys are cold-formed before stress at higher temperatures the grain boundaries are destroyed and intercrystalline fracture can no longer occur. The brittle zone occurs only on the surface, and the continuation of the fracture can only take place within this area. In this case no brittleness can be observed.
    Notizen: Warmfeste Titanlegierungen, die in fast allen Fällen Aluminium als Zusatzelement enthalten, zeigen bei erhöhten Temperaturen eine Neigung zum Sprödhruch, wobei die maximal erreichbare Debnung der Proben mit wachsender Versuchszeit abnimmt. Untersuchungen an den legierungen TiAl5Sn2, 5, TiAl6V4, TiAl7Mo4 und TiAl9V3 mit Hilfe der Elektronenstrahl-Mikroanalyse haben gezeigt, daß Aluminium infolge der Reaktion mit der Atmosphäre an der Oberfläche angereichert wird. Infolge der Anreicherung an Aluminium bildet sich an der Oberfläche eine überstruktur des a-Mischkristalls, die einen anderen Verformungsmechanismus aufweist als der überstrukturfreie a-Mischkristall. Eine Diffusion des Aluminiums erfolgt hauptsächlich entlag der Korngrenzen, wodurch diese ebenfalls an Auminum angeriechert werden und zur Versprödung neigen. Bei Legierungen, die polygonales Korn aufweisen, tritt deshalb infolge dieser Aluminiumanreicherung der Sprödbruch immer interkristallin auf. Werden die Legierungen von der Beanspruchung bei erhöhter Temperatur kaltverformt, so werden die Korngrenzen zerstört, und der interkristalline Bruch kann nicht mehr auftreten. Die versprödete Zone tritt nur an der Oberfläche auf, und die Fortpflanzung des Bruches kann nur in diesem Bereich erfolgen. Eine Versprödung wird deshalb in diesem Fall nicht beobachtet.
    Zusätzliches Material: 15 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/maco.19680191012
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 25
    Digitale Medien
    Digitale Medien
    Poly(vinyl alcohol)-iodine complexes (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 2393-2424 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The poly(vinyl alcohol)-iodine blue color reaction in dilute aqueous solution has been investigated, and extinctions at the absorption maximum have been measured as a function of the concentrations of polymer, iodine, iodide ions, and boric acid. Depending upon the reaction conditions, the main absorption maximum can be made to appear at any wavelength between 580 and 700 mμ, with the longest wavelengths and highest extinctions per vinyl alcohol group showing up at high boric acid concentrations. Poly(vinyl alcohol) samples from various sources displayed, under identical reaction conditions, great differences in staining intensities. This can be ascribed to differences in the regularity of the polymer chain structures. To account for the behavior of poly(vinyl alcohol) towards iodine under a wide variety of reaction conditions, as well as for a number of irreversible or only slowly reversible phenomena, a model for the mechanism of the PVA-iodine complex formation is proposed involving a dual process of helix formation and intramolecular helix association. There is evidence to indicate that at full iodine saturation of the polymer, 12 vinyl alcohol residues supported by one boric acid molecule form a single turn of a helix which enwraps one iodine atom, out of a long polyiodide chain nested in the interior of a poly(vinyl alcohol) helix.
    Zusätzliches Material: 15 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1965.070090706
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 26
    Digitale Medien
    Digitale Medien
    The blue complexes of iodine with poly(vinyl alcohol) and amylose (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 4 (1966), S. 1642-1644 
    Details
    ISSN: 0449-296X
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1966.150040626
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 27
    Digitale Medien
    Digitale Medien
    Low wavenumber Raman scattering in viscous liquids (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 25 (1994), S. 849-854 
    Details
    ISSN: 0377-0486
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Low-wavenumber depolarized Raman spectra (-400 to 400 cm-1) for dioxane, water and glycerol are presented. Stokes and anti-Stokes spectra (-400 to 400 cm-1), are used to define a reduced spectrum, in which the effects of temperature and also flat backgrounds and symmetric central components are removed, without knowledge of these parameters. Comparison with the usual reductions shows that (i) all inelastically scattered photons must be considered as ‘true’ Raman signals, due to processes involving Boson-like excitations, (ii) if central scattering exists, then its intensity also depends on the population factor, (iii) the low-wavenumber Stokes signal is more intense than expected for a factor of n + 1 only, owing to non-linear effects, and (iv) the systematic use of reduced spectra is not essential, and can be hazardous in some cases.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jrs.1250251102
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 28
    Digitale Medien
    Digitale Medien
    Zur Bestimmung der Dispersität von reinem α-Al2O3 für die Herstellung von vakuumdichter Keramik (1977)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 49 (1977), S. 669-669 
    Details
    ISSN: 0009-286X
    Schlagwort(e): Porosimetrie ; Porenvolumen ; Zwischenkontakträume ; Porenstruktur ; vakuumdichte Keramik ; Aluminiumoxid ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cite.330490819
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 29
    Digitale Medien
    Digitale Medien
    Nanostructures and mesoscopic systems. Edited by W. P. Kirk and M. A. Reed, Academic Press, London 1992, 551 pp., hardcover $69.95, ISBN 0-12-409660-3 (1992)
    Weinheim : Wiley-Blackwell
    Advanced Materials 4 (1992), S. 693-693 
    Details
    ISSN: 0935-9648
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/adma.19920041024
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 30
    Digitale Medien
    Digitale Medien
    Gas chromatographic analysis of estrogens from pregnant mares' urine using glass capillary columns (1980)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 3 (1980), S. 169-171 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Glass capillary columns ; Trimethylsilyl derivatives ; Pregnant mares' urine estrogens ; Estrone-equilin separation ; OV-225, Silar 10C stationary phases ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Glass capillary columns coated with OV-225 and Silar 10C were used to analyze estrogens (as their trimethylsilyl derivatives) present in pregnant mares' urine. Such columns provide better resolution in a shorter time than the corresponding packed columns, as exemplified by the separation of estrone from equilin.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240030404
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 31
    Digitale Medien
    Digitale Medien
    Singlet oxygen and polymer photooxidations. I. Sensitizers, quenchers, and reactants (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 13 (1975), S. 717-736 
    Details
    ISSN: 0360-6376
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A study designed to ascertain the role of singlet molecular oxygen in the photodegradation of plastics established that most classes of dye chromophores are sensitizers in polymer films, absorbing light and transferring the absorbed energy to ambient triplet ground state molecular oxygen, generating metastable reactive singlet molecular oxygen. Unsaturated polymers containing polybutadiene, polyisoprene, etc. are highly reactive to singlet oxygen produced through photosensitization, generating hydroxylic and carbonyl derivatives and losing their rubbery properties as consequences of such reactions. Many types of transition metal chelates are singlet oxygen quenchers. The relationships of the structures and spectroscopic properties of these chelates to their efficiency in quenching singlet oxygen are examined and discussed.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1975.170130314
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 32
    Digitale Medien
    Digitale Medien
    Singlet oxygen and polymer photooxidations. II. Photodegradation of an olefinically unsaturated polymer (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 13 (1975), S. 993-1014 
    Details
    ISSN: 0360-6376
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A method based on infrared spectral changes in thin films was devised and used to evaluate the relative effectiveness of various types of additives on photodegradative processes in an olefinically unsaturated polymer. Nickel chelates of the thiobisphenol-amine complex type are shown to be quantitatively more effective in retarding the photodegradation of these polymers than other additives having greater singlet oxygen quenching efficiencies, ultraviolet absorption, or radical antioxidant properties. Photosensitization with a singlet oxygen sensitizer (fluoranthene) rapidly produces degradative effects in the polymer which are identical with those of its direct degradation by light. The sensitized effects are also retarded by the nickel chelates. Photosensitization by a hydrogen atom-abstracting sensitizer (a benzophenone) proved considerably less effective. The effectiveness of the nickel complexes appears to be due to a combination of their ability to quench singlet oxygen and precusor excited states and their relative stability under photoexposure conditions.
    Zusätzliches Material: 14 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1975.170130417
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 33
    Digitale Medien
    Digitale Medien
    On the mechanism of anionic polymerization of maleic anhydride, 2Part 1, cf.1.Extracts reported on occasion of the Macromolecular Colloquium 1972 in Freiburg i. Br., BRD. (1973)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 170 (1973), S. 141-153 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Die anionische Polymerisation von Maleinsäureanhydrid, initiiert mit Triphenylphosphin oder mit Tributylphosphin, wurde untersucht. Unter den gegebenen Reaktionsbedingungen entstanden Makro-Zwitterionen, deren Struktur vom jeweiligen Initiator bestimmt wurde. Im Falle der Polymerisationsauslösung mit Triphenylphosphin erhielt man Polymere, die Bernsteinsäureanhydrid-Gerüste und als deren Umlagerungsprodukt Cyclopentanonderivate enthielten. Bei der Polymerisationsauslösung mit Tributylphosphin gelangte man zu Polymerisaten, die weitgehend aus konjugierten Ketoolefinelementen bestanden. Zur Strukturaufklärung wurden IR, NMR- und massenspektroskopische Methoden benutzt. Die Makrozwitterionen wurden mittels Hochspannungselektrophorese nachgewiesen.Die Halbleitereigenschaften des aus konjugierten Ketoolefinelementen bestehenden Polymerisats werden diskutiert.Die Kinetik der Polymerisation von Maleinsäureanhydrid mit Triphenylphosphin wurde spektroskopisch untersucht. Die initiierende Reaktion des bei Reaktion mit dem Monomeren gebildeten Ylides war etwa 90 mal langsamer als das Kettenwachstum durch Addition des Monomeren an das wachsende Kettenende.
    Notizen: The triphenyl and tributyl phosphine initiated polymerization of maleic anhydride was investigated. The structure of the macro zwitterions, formed under the given reaction conditions, depended on the initiator employed. If the polymerization was initiated by triphenyl phosphine, the macromolecules contained succinic anhydride units and cyclopentanone derivatives, formed from further rearrangement. If, however, tributyl phosphine was employed as initiator, the polymers were mostly made up of conjugated ketoolefinic units. IR, NMR and mass spectrometric measurements were carried out to determine the structure of the polymers. Existence of the macro zwitterions was proved by high voltage electrophoresis.The semi-conductor properties of the polymers containing conjugated ketoolefinic units are discussed.Spectroscopic investigation of the kinetics of the triphenyl phosphine initiated polymerization of maleic anhydride showed that the initiation reaction of the ylide, formed with the monomer, proceeded about 90 times slower than the propagation reaction due to addition of the monomer to the growing chain-end.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1973.021700111
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 34
    Digitale Medien
    Digitale Medien
    Zur kenntnis der anionischen polymerisation von maleinsäureanhydrid (1972)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 153 (1972), S. 125-137 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Maleic anhydride was found to polymerize spontaneously in presence of pyridine bases, triphenylphosphine and tributylphosphine. The formation of two characteristic types of structural elements during this polymerization can be explained with the aid of a reaction model. Analytical data (IR, NMR, and ESR spectroscopy, titrations) are given to characterize the structural elements of the polymers. Their compounds of degradation have been partially isolated and characterized.
    Notizen: In Gegenwart von Pyridinbasen, von Triphenylphosphin oder Tributylphosphin polymerisiert Maleinsäureanhydrid spontan. Anhand eines Reaktionsmodelles wird die Bildung der beiden charakteristischen Strukturelemente in diesen Maleinsäureanhydridpolymerisaten erklärt. Die Strukturelemente der Polymeren wurden durch die analytischen Daten (IR-, NMR-, ESR-Spektroskopie, Titrationen) belegt. Zum Teil wurden die Abbauprodukte isoliert und identifiziert.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1972.021530110
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 35
    Digitale Medien
    Digitale Medien
    Electron paramagnetic resonance and Mössbauer studies of metal chelation by adriamycin (1995)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 33 (1995), S. S114 
    Details
    ISSN: 0749-1581
    Schlagwort(e): electron paramagnetic resonance ; adriamycin ; metal chelation ; coordination structure ; iron ; free radical ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: EPR and Mössbauer studies demonstrate that iron chelation by adriamycin is complex, with several different chelation structures. At physiological pH in aqueous solution, three different EPR spectra are observed: a spectrum at g = 4.2 of Fe3+ in a rhombic crystal field (type 1); a spectrum at g = 2.01 with symmetric Gaussian lineshape linewidth 225 G (1 G = 10-4 T), suggestive of Fe3+ bound in an octahedral crystal field (type 2); and a broad spectrum centered at g = 2.0 suggestive of ferromagnetically coupled Fe3+ (type 3). The type 1 and 2 spectra are observed at adriamycin/Fe3+ ratios 〉4, the type 3 spectrum is observed at ratios 〈4 and at ratios 〈2 an increasing amount of Fe3+ gives rise to EPR silent iron(III) hydroxide polymers. At 4 K the type 1 and 2 complexes exhibit a broad doublet Mössbauer signal with an isomer shift δ = 0.56 (1) mm s-1 and quadrupole splitting δEQ = 0.74 (1) mm s-1. The type 3 complex gives rise to a sextet signal with isomer shift ΔEq = 0.47 (1) mm s-1 and hyperfine splitting HF = 476 (1) kG with exhibits superparamagnetic relaxation behavior with a blocking temperature of 23 K, consistent with a microcrystal size of 25 Å. Cu2+ binds to adriamycin at adriamycin/Cu2+ ratios 〉4:1 giving rise to an EPR spectrum with axial symmetry g∥ = 2.26, g⊥ = 2.066, A∥ = 188 G, while 2:1 complexes exhibit a single Gaussian line at g = 2.09 indicative of exchange-coupled Cu2+. The exchange-coupled Cu2+ and ferromagnetically coupled Fe3+ complexes can be explained by the formation of stacked 2:1 adriamycin-metal polymers. On titration of adriamycin with Fe3+-nitrilotriacetate a different spectrum is observed at g = 4.3 and its intensity plateaus at an adriamycin/iron ratio of 2. The iron adriamycin complexes cycle to reduce molecular oxygen and this cycle has been hypothesized to be a mechanism mediating the therapeutic and toxic effects of the drug. Both EPR and Mössbauer experiments demonstrate that the type 1 and 2 chelates reduce their Fe3+ to Fe2+ while the type 3 chelate does not. Therefore, the stoichiometry and method of complex preparation can profoundly effect the properties of these complexes.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260331318
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 36
    Digitale Medien
    Digitale Medien
    Collagen as a biomaterial: Modulus jump and degradation of collagen gelsPresented before the American Institute of Chemical Engineers 80th National Meeting, Boston, 1975. (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 20 (1976), S. 2871-2878 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The effect of temperature on the storage modulus G′ of UV crosslinked collagen has been investigated. Collagen solutions, 0.5%, at pH 2.2 were irradiated at 4°C to a maximum modulus, after which they were stored at 4°C. In order to study the effect of temperatures above 4°C, the gels were placed in a constant-temperature bath and the change in modulus with time was recorded using a torsion pendulum. The temperatures studied ranged from 25° to 60°C. The results show an initial jump in modulus immediately on heating presumably due to the helix-coil transition. The modulus goes through a maximum value. There is then a decay of modulus with time which is linear on a semilog plot. This could indicate a first-order chain-scission reaction, since the storage modulus is directly proportional to the number of crosslinks. A simple kinetic expression can be written for which the value of the rate constant can be determined from the data.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1976.070201021
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 37
    Digitale Medien
    Digitale Medien
    The mechanism of vinyl polymerization initiated by metal alkyls: Copolymerization studies (1960)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 43 (1960), S. 445-452 
    Details
    ISSN: 0022-3832
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Monomer reactivity ratios have been determined for the copolymerization of methyl methacrylate (M1) and acrylonitrile (M2) catalyzed by alkyl derivatives of lithium, sodium, beryllium, magnesium, boron, aluminum, zinc, and cadmium. Lithium, sodium, beryllium, and magnesium alkyls gave reactivity ratios averaging r1 = 0.34, r2 = 6.7, while alkyls of boron, aluminum, zinc, and cadmium gave r1 = 1.24, r2 = 0.11. These values compare favorably with published reactivity ratios for anionic copolymerization (r1 = 0.25, r2 = 7.9) and free-radical copolymerization (r1 = 1.35, r2 = 0.18). Therefore, alkyl derivatives of groups Ia and IIa metals propagate by an anionic mechanism, while those of groups IIb and IIIa do so by a free-radical mechanism. Confirmatory experiments were run using styrene (M1)-acrylonitrile (M2) solutions. For groups Ia and IIa alkyls the reactivity ratios averaged, r1 = 0.20, r2 = 12.5; and for Groups IIb and IIIa r1 = 0.33, r2 = 0.03. The published values for free-radical catalysts are r1 = 0.41, r2 = 0.04. The formation of free radicals from the groups IIb and IIIa metal alkyls probably arises from oxidation of the metal alkyls by chance traces of oxygen.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1960.1204314214
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 38
    Digitale Medien
    Digitale Medien
    The stiffness of ethylene copolymers (1962)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 60 (1962), S. S36 
    Details
    ISSN: 0022-3832
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1962.1206016922
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 39
    Digitale Medien
    Digitale Medien
    Mechanical behavior of poly(stilbestrol carbonate) (1962)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 62 (1962), S. S171 
    Details
    ISSN: 0022-3832
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1962.1206217467
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 40
    Digitale Medien
    Digitale Medien
    Correlation of the properties of model compounds and the main chain glass transition in polymers (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 2 (1964), S. 709-713 
    Details
    ISSN: 0449-2986
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1964.110020711
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 41
    Digitale Medien
    Digitale Medien
    Copolymerization studies. VI. Spontaneous copolymerization of bicyclo[2.2.1]hept-2-ene and sulfur dioxide. Evidence for propagation by biradical couplingFor a preliminary report on this work see Zutty and Wilson.1 (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 2781-2799 
    Details
    ISSN: 0449-2951
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The alternating copolymerization of bicyclo[2.2.1]hept-2-ene and sulfur dioxide has been found to be quite unusual for a free-radical polymerization: (1) the initiation of copolymerization is spontaneous, even at -40°C.; (2) solution copolymerization is extremely fast, yielding very high molecular weight polymer within a few seconds; (3) conversions are high (up to 93% within a minute); (4) molecular weight during copolymerization increases at essentially constant conversion; (5) the reaction is incapable of being chemically inhibited indefinitely, short of exhausting one of the constituent monomers; (6) at elevated temperatures, the monomers and copolymer appear to be in equilibrium; (7) large concentrations of free radicals have been detected by electron paramagnetic resonance to be associated with the bulk copolymerization; and (8) the copolymerization appears to result in “living” free-radical polymers. A copolymerization mechanism is proposed to explain these observations. Bicycloheptene and sulfur dioxide initially form a 1 : 1 molecular charge transfer complex which rearranges to a biradical; subsequent coupling of biradicals with each other (and possibly also with the molecular complexes themselves) leads to rapid propagation to high molecular weight, alternating copolymer. Speculations that similar mechanisms may be important in other copolymerization reactions are also made.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1965.100030806
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 42
    Digitale Medien
    Digitale Medien
    Synthesis of vinyl polymers containing α-substituted γ-butyrolactone groups in their backbones (1963)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 1 (1963), S. 2289-2297 
    Details
    ISSN: 0449-2951
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: When vinyl chloride - methyl methacrylate copolymers having a uniform chain-to-chain composition, are pyrolyzed at temperatures around 150°C., an intramolecular lactonization occurs forming α-methyl-γ-butyrolactone groups in the polymer backbone concomitant with the quantitative elimination of methyl chloride. This reaction has been shown to be a general reaction for copolymers containing α-substituted γ-haloester groups in their backbone. The formation of the lactone groups in these polymers leads to increased chain rigidity and higher polymer softening points. Advantage has been taken of the gaseous alkyl halide elimination to produce rigid vinyl foams of good compressive strengths.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1963.100010706
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 43
    Digitale Medien
    Digitale Medien
    Copolymerization studies. IV. Transannular copolymerization of bicyclo[2.2.1] hepta-2,5-dieneFor Part III of this series, see Burkhart and Zutty1 (1963)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 1 (1963), S. 2231-2236 
    Details
    ISSN: 0449-2951
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Bicyclo[2.2.1]hepta-2,5-diene, in the presence of free-radical initiators, homopolymerizes to a low molecular weight, soluble polymer containing both 3,5-disubstituted nortricyclene and 5,6-disubstituted bicyclo [2.2.1] hept-2-ene units in the polymer backbone. When the bicycloheptadiene (M2) is copolymerized with vinyl chloride, vinylidene chloride, acrylonitrile, ethyl acrylate, and methyl methacrylate, only the transannular product, 3,5-disubstituted nortricyclene, is found in the high molecular weight copolymers. Reactivity ratios for the above mentioned copolymerizations at 50°C. are: r1 = 0.74, r2 = 0.35; r1 = 1.41, r2 = 0.08; r1 = 0.67, r2 = 0.08; r1 = 3.05, r2 = 0.01; r1 =10.0, r2 = 0; respectively. From these data, the Q and e values for bicyclo[2.2.l]hepta-2,5-diene average 0.09 and -1.04, respectively.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1963.100010645
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 44
    Digitale Medien
    Digitale Medien
    Backbone-assisted reactions of polymers. VII. Kinetics of isomerization of poly[(chloromethyl)thiirane] in the absence of solvent (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 26 (1988), S. 313-319 
    Details
    ISSN: 0887-624X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The kinetics of the repeating unit isomerization of poly[(chloromethyl)thiirane] have been determined at four temperatures in the absence of solvent. The reaction can be treated as a reversible first-order process with rate constants and activation energies similar to those observed in analogous reactions of β-chlorosulfides of low molecular weight. These observations are consistent with a mechanistic scheme that involves rate determining cyclization to a thiiranium ion intermediate, followed by rapid ring opening by chloride ion attack.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1988.080260130
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 45
    Digitale Medien
    Digitale Medien
    Backbone-assisted reactions of polymers. V. Kinetics of isomerization of poly(chloromethylthiirane) and poly(3-chlorothietane) in solution (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 1417-1422 
    Details
    ISSN: 0360-6376
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The reversible isomerization of poly(chloromethylthiirane) and poly(3-chlorothietane) represents a new kind of polymer reaction and a new method of copolymer synthesis. In chloroform, in dichloromethane, or in nitrobenzene the reaction is well described by reversible first-order kinetics. A rate increase of ca. 40% on changing the solvent from chloroform to nitrobenzene is consistent with an isomerization mechanism that involves a rate-determining attack of the backbone sulfur atom on the neighboring carbon-chlorine bond and rapid ring-opening of the thiiranium ion intermediate by chloride ion.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1983.170210515
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 46
    Digitale Medien
    Digitale Medien
    Modification of polyimide coatings by high energy ion bombardment (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 35 (1988), S. 2183-2191 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Exposure of 25-μm films of polyimide and polyamideimide to high doses (〉 1015/cm2) of energetic ions (energy ≥ 100 keV) resulted in physical and chemical modification of the film surface. Cross-section microscopy revealed damaged layers extending beyond the projected ion range; conductivity in this damaged layer was found to be as high as 103ω-1 cm-1. Surface conductivity was found to be a function of ion energy and dose, with an exponential energy dependence from 200 to 900 keV. The temperature dependence and thermal stability of the surface conductivity were determined.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1988.070350818
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 47
    Digitale Medien
    Digitale Medien
    81. Ökologische Bewertung von Produkten und Prozessen - Herausforderung und Chance (1994)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 66 (1994), S. 1210-1210 
    Details
    ISSN: 0009-286X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cite.330660982
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 48
    Digitale Medien
    Digitale Medien
    Der Einfluß der Kohlenstoff-Diffusion auf die mechanisch-technologischen Eigenschaften von ferritisch-austenitischen Schweißverbindungen im Chemie-BetriebErweiterte Fassung eines Vortrages auf der ACHEMA 1973, Frankfurt/Main.Herrn Professor Dr.-Ing. E. h. Helmut Wagner zum 65. Geburtstag gewidmet (1974)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 5 (1974), S. 146-155 
    Details
    ISSN: 0933-5137
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: The effect of carbon diffusion on the mechanical properties of ferritic-austenitic weldments. Weldments between ferritic and austenitic steels indicate a diffusion of carbon from ferritic to austenitic partner as an influence of temperature stresses and due higher solubility of carbon in γ-iron in comparison to α-iron.Investigations on two characteristic weldments (German standard H II/1.4571 and H II/Ni) have been conducted in different annealed conditions to study the effect of carbon diffusion on the various mechanical properties.There is an observable impairement of the mechanical properties of the weldments. Increased hardness in the carburised zone causes cracking and tensile strength as well as notch toughness decrease in the decarburised area.
    Notizen: In Schweißverbindungen zwischen ferritischen und austenitischen Stählen tritt bei einer Temperaturbeanspruchung eine Diffusion des Kohlenstoffes vom ferritischen Stahl in Richtung des austenitischen Schweißgutes aufgrund der größeren Kohlenstofflöslichkeit des γ-Fe gegenüber dem α-Fe ein. Der Diffusionsbereich gliedert sich in eine entkohlte, mehr oder weniger grobe, stengelkornförmige Zone aus α-Fe, ferner in eine feinkörnige Zone mit schmalem perlitischem Saum auf der Ferritseite der Verbindung, außerdem einem Karbidsaum auf der Austenitseite im γ-Fe-Gebiet sowie dem anschließenden austenitischen Schweißgut, welches ebenfalls langgestreckte, vergrößerte Kornstruktur (Schweißgußgefüge) aufweist (Diffusion, Effusion).In diesem Bereich, der lichtmikroskopisch gut erkennbar ist, sind die mechanisch-technologischen Eigenschaften merklich beeinträchtigt. In der feinkörnigen, perlitförmigen Zone treten hohe Härten auf, die wahrscheinlich durch Ausscheidung feiner Karbide im Sinne einer Auscheidungshärtung bedingt oder auf eine inhomogene Lösung des Kohlenstoffes im Austenit zurückzuführen sind. Die hohen Härten in dieser Zone sind für Rißbildungen verantwortlich. Die Zugfestigkeit der Gesamtverbindung sinkt mit steigender Temperaturbeanspruchung und auch die Kerbschlagzähigkeit fällt mit erhöhter Temperaturbeanspruchung deutlich ab. Hierfür sind sowohl der entkohlte, stengelförmige Gefügebereich als auch die schmale Härtezone verantwortlich. Diese Zusammenhänge werden durch Mikrosondenuntersuchungen qualitativ bestätigt.Die Kohlenstoff-Diffusion ist als auslösender Faktor für die Verminderung der mechanisch-technologischen Eigenschaften und den damit zusammenhängenden Folgen, wie Entstehen von Spannungsrissen bzw. Trennbrüchen, ferner der Spannungsrißkorrosion bei Vorhandensein entsprechender Korrosionsbedingungen verantwortlich.
    Zusätzliches Material: 19 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mawe.19740050309
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 49
    Digitale Medien
    Digitale Medien
    Korrosion verstehen - Korrosionsschäden vermeiden. Hrsg. von H. Gräfen und A. Rahmel, 2 Bände, ca. 800 S., Verlag Irene Kuron, Bonn 1994, DM 198,00, ISBN 3-923623-14-3 (1995)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 46 (1995), S. 388-388 
    Details
    ISSN: 0947-5117
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/maco.19950460614
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 50
    Digitale Medien
    Digitale Medien
    Radical copolymerization and terpolymerization of 1,1,2,3,4,4-hexafluoro-1,3-butadiene with alkylvinyl ethers, alkenes, and methyl-2,3,3-trifluoroacrylate (1987)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 155 (1987), S. 101-115 
    Details
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Copolymers of 1,1,2,3,4,4-hexafluoro-1,3-butadiene (HFB) with n-alkylvinyl ethers (AVE) (alkyl being butyl, propyl, ethyl, and glycidyl) or alkenes of the type isobutylene, ethylene, and propylene were synthesized by the solution radical copolymerization using low-temperature peroxide initiators. The reaction proceeded by radical mechanism and was fully inhibited by the addition of 1,1-diphenyl-2-picryl-hydrazyl.
    Notizen: Copolymere von 1,1,2,3,4,4-Hexafluor-2,3-butadine (HFB) mit n-Alkylvinylethern(AVE) (Alkyl = Butyl, Propyl, Ethyl and Glycidyl) order mit Alkenen wie isobuten, Ethylen and Propylen wurden durch radikalische Lösungscopolymerisation unter Verwendung von peroxidischen Neidertemperatureinition synthesiert. Die Polymerisation verlief nach radikalischem Mechanismus and wurse durde durch die Zugable vo 1,2-Diphenyl-2-pikryl-hydrazyl völling inhibiert. Die Anfangsgeschwindigkeit der Copolymerisation hing von der Gesamtkozentration der Monomeren and von von dem Verhältnis [HFB] zu [AVE] ab; die maximale Reaktiongeschwindigkeit wurde bei etea äquimolaren Konzentrationsverhältnissen der monomeren erzielt.Durch die untersuchung der Struktur der copolymeren HFB-AVE wurde die alter-neirende Anordnung der Hexafluorobutadien-and Vinylethereinheinten in der Copolymerkette nachgewiesen. Durch die radikalische Lösungsterpolymerisation des Monomerensystems HFN-AVE Methyl-2,3,3,-trifluoracrylet (MTFA) wurden Terpolymere des Typus-[HFB]x-[AVE]y-[MTFA]z -synthetisirt, deren Struktur einer alternierrenden Anordnung von Perfluor- (HFB and MTFA) and Vinylethereinheiten entspricht. Durch alkalische hydrolyse der Trifluoracrylateinheiten wurden die entsprechenden Terpolymeren der Triflurocrylsäure synthesiert.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/apmc.1987.051550109
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 51
    Digitale Medien
    Digitale Medien
    Reactive polymers. XII. Bead macroporous methacrylate terpolymers containing aldehyde groups (1978)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 66 (1978), S. 75-93 
    Details
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Makroporöse Perl-Terpolymere aus Methacrylaldehyd, Methylmethacrylat und äthylendimethacrylat wurden hergestellt. Die Polymerisationsbedingungen (Zusammensetzung der Monomermischung und der inerten Phase, die Konzentration an Initiator und an Suspensionsstabilisator, Rühregeschwindigkeit) werden im Hinblick auf die Eigenschaften der Terpolymeren (Porosität und Konzentration an reaktiven Aldehydgruppen) diskutiert.Die Konzentration an reaktiven Gruppen wurde durch Zugabe des dritten Monomeren variiert. Die analytisch bestimmten Unterschiede in der Konzentration an reaktiven Gruppen im Monomerengemisch und im Polymeren werden interpretiert (a) durch Unerreichbarkeit der Gruppen im Innern der Substanz, (b) durch Bildung von Tetrahydropyranringen und Acetatbin lungen zwischen den Ketten und (c) duch Bildung von extrahierbaren Polymeren und Copolymeren sowie nichtumgesetzten Anteilen an Monomeren.
    Notizen: Bead macroporous terpolymers of methacrylaldehyde with methyl methacrylate and ethylene dimethacrylate were prepared. Preparation conditions (composition of the monomer mixture, of the inert components, concentration of the initiator and of the suspension stabilizer, and the rate of stirring) were discussed with respect to the properties of the terpolymers (porosity and concentration of reactive aldehyde groups).Concentration of reactive groups in the polymer was controlled by adding a third monomer. The analytically determined differences in the concentration of the reactive groups in the batch and in the polymer were interpreted (a) by the inaccessibility of the groups within the polymer bulk (for polymers with 30-50 mol-% of crosslinking agent), (b) by the presence of tetrahydropyran rings or acetate bonds between the chains, and (c) by the formation of extractable soluble polymers or copolymers, or by not reacting of parts of the monomers (observed predominantly with low-crosslinked polymers containing 10 mol-% of crosslinking agent).
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/apmc.1978.050660107
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 52
    Digitale Medien
    Digitale Medien
    Preparation and properties of copolymers of methyl-2,3,3-trifluoroacrylate with alkenes and alkyl vinyl ethers (1986)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 141 (1986), S. 131-139 
    Details
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Durch eine mit Diisopropoxycarbonylperoxid initiierte radikalische Lösungspolymerisation wurden Copolymere von Methyl-2,3,3-trifluoracrylat mit Isobutylen, Propylen, Ethylen und n-Alkylvinylethern (wobei Alkyl Ethyl, Propyl oder Butyl bedeutete) hergestellt. Die Struktur der Copolymeren entspricht einer alternierenden Zusammensetzung der Methyltrifluoracrylat- und Comonomer-Einheiten. Die Polymerisationsgeschwindigkeit und die Molekulargewichte sind durch das Verhältnis der beiden Monomeren und durch die Art des Vinylmonomeren bedingt. Die alkalische Hydrolyse der Trifluoracrylateinheiten liefert Copolymere der Trifluoracrylsäure. Der Dissoziierungsgrad der Copolymeren wird durch den pK-Wert charakterisiert. Die Hydrolysegeschwindigkeit ist stark von der Struktur des Copolymeren abhängig. Die Polymeren sind gut beständig gegen höhere Temperaturen, und eine thermische Zersetzung erfolgt erst bei über 300°C.
    Notizen: Copolymers of methyl-2,3,3-trifluoroacrylate with isobutylene, propylene, ethylene, and n-alkyl vinyl ethers, (the alkyl being ethyl, propyl, butyl) glycidyl vinyl ether, and 2-methoxyethylvinyl ether were prepared by radical solution polymerization using di(isopropoxycarbonyl) peroxide as the initiator. Their structure was that of the alternating order of methyltrifluoroacrylate and the respective vinyl monomer units. The rate of copolymerization and molecular weights of the copolymers were determined by the ratio of both monomers and by the character of the vinyl comonomer. By means of the alkaline hydrolysis of trifluoroacrylate units, the corresponding copolymers of trifluoroacrylic acid were prepared. Their degree of dissociation was characterized by pK values. The rate of alkaline hydrolysis was considerably affected by the copolymer structure. The polymeric materials prepared in this study possessed good thermal stability, and their thermal decomposition did not occur below 300°C.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/apmc.1986.051410113
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 53
    Digitale Medien
    Digitale Medien
    Organic-inorganic character of plasma-polymerized hexamethyldisiloxane (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 62 (1996), S. 2147-2154 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Plasma polymerization is a useful method for depositing thin films on substrates. The films formed are cross-linked, and their character depends on the plasma polymerization process conditions. The influence of power and monomer flow rate on the character of plasma-polymerized hexamethyldisiloxane (PPHMDSO) was investigated. The deposition rate increased strongly with HMDSO flow rate at low powers, indicating that the plasma is mono-mer-deficient. Increasing the power yielded a rapid drop in deposition rate, which reached a relatively flow rate-independent plateau at high power. At high flow rates and low powers, the similarity between the plasma polymer with its high hydrocarbon concentration and the monomer was greatest. At high powers, the monomer was more intensively fragmented yielding a more inorganic structure rich in silicon and oxygen. Generally, the plasma polymer seems to be a silicon-oxygen network with short hydrocarbon chains that may include hydroxyl and/or carbonyl groups attached to the silicon in the backbone. The inorganic nature of the plasma polymer at high powers and low flow rates is reflected in its relatively high polar component of surface tension. © 1996 John Wiley & Sons, Inc.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
  • 54
    Digitale Medien
    Digitale Medien
    Mechanical properties of twisted filaments (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 25 (1980), S. 2681-2697 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The knowledge of some mechanical properties of twisted filament is necessary to predict properties of continuous-filament yarns. Retraction, strength, strain, and elastic properties of filaments are the chief characteristics. Assuming that the filament can be considered as a yarn made of fibers bounded together and then twisted, formulas for prediction of those properties were elaborated and then compared with the experimentally received values. Satisfactory agreement of computed results with experimental values is obtained if the changes in volume of filament at strain is taken into account.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1980.070251202
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 55
    Digitale Medien
    Digitale Medien
    Mechanical properties of multifilaments in different measurement conditions (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 43 (1991), S. 1343-1356 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Starting from Zhurkov's and Bartenev's theories and connecting them with Bailly's theorem and the structural analysis based on the rheological model, a method of determination of parameters describing the durability of multifilament is presented. Experiments carried out on polyester and polyamide filament yarns confirmed proposed method.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1991.070430717
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 56
    Digitale Medien
    Digitale Medien
    A new method of determining the optical properties of cotton fibers using polarizing interference microscopyCorrected proofs Received January 19, 1983 (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 1277-1281 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The refractive indices, birefringence, and cross-sectional area of cotton fibers was measured using interference polarizing microscope constructed by M. Pluta. A new technique was suggested by realizing the measurements at the perpendicular position of the duplicated image of fiber to the interference fringe. The proposed procedure is a combination of modification of Hamza method and Pluta dual wavelength method, and it was possible to measure at once the three mentioned features of single fiber at one time.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1983.070280402
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 57
    Digitale Medien
    Digitale Medien
    Fluid mechanics for chemica engineers (second edition), by Noel de Nevers, Mcgraw-Hill, New York, 1991, 558 p. Price: $48.95 (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 169-169 
    Details
    ISSN: 0887-624X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1992.080300125
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 58
    Digitale Medien
    Digitale Medien
    Solid-state polymerization of acrylamide and its derivatives complexed with lewis acids. I. Synthesis of complexes (1981)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 19 (1981), S. 363-369 
    Details
    ISSN: 0360-6376
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Complexes of acrylamide, methacrylamide, and their homologs with zinc, cadmium, and mercury halides were prepared by various methods. Molecular compositions, the nature of the coordination, and some physicochemical properties (melting points and initial decomposition temperatures) were determined. The effect of the chemical structure of particular monomers, metal ion, and halide on the possibility of complex formation and on the properties of the complex compounds were observed. Most of these complexes have not been described in the scientific literature.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1981.170190212
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 59
    Digitale Medien
    Digitale Medien
    Solid-state polymerization of acrylamide and its derivatives complexed with some lewis acids. II. Radiation-induced in-source polymerizationAuthor corrected proofs received April 27, 1982 (1982)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 20 (1982), S. 1775-1784 
    Details
    ISSN: 0360-6376
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Radiation-induced solid-state polymerizations of complexes of N-tert-butylacrylamide, N-tert-amylacrylamide, and N-tert-hexylacrylamide with zinc chloride and zinc bromide have been studied. An accelerating effect of temperature and an inhibiting effect of oxygen on the polymerization process were observed. The activation energies have been established. The influence of monomer structure as well as the halide used on the polymerization rate have been discussed and some regularities have been pointed out. The polymers obtained show good solubilities in common solvents, which proves that they are not crosslinked.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1982.170200710
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 60
    Digitale Medien
    Digitale Medien
    Solution polymerization of N-tert-alkylacrylamides catalyzed by ZnCl2. I. Study of the structure of complexes (1984)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 22 (1984), S. 649-657 
    Details
    ISSN: 0360-6384
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1984.130221204
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 61
    Digitale Medien
    Digitale Medien
    Solution polymerization of N-tert-alkylacrylamides catalyzed by ZnCl2 (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 16 (1978), S. 317-319 
    Details
    ISSN: 0360-6384
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1978.130160701
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 62
    Digitale Medien
    Digitale Medien
    Das Korrosionsverhalten von Hartmetall-Verbundwerkstoffen in chloridhaltigen wäßrigen LösungenHerrn Prof. H. Spähn zum 60. Geburtstag gewidmetAuszug aus der Dissertation D. zur Megede, Universität Frankfurt, 1985. (1986)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 37 (1986), S. 207-214 
    Details
    ISSN: 0947-5117
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Corrosion behaviour of metal matrix composites in chloride containing solutionsTwo experimental set-ups on the basis of rotating disks have been used to investigate the corrosion processes on nickel and cobalt matrix tungsten carbide composites. The influence of corrosion parameter such as chloride concentration, temperature and flow rate have been tested. It is shown that by combination of cathodically active WC with an anodically unstable metal matrix oxygen corrosion occurs which is designated as “internal bimetallic corrosion”. Such an internal bimetallic corrosion can by described by a pore model consisting in its base of the metal matrix, on the wall of WC and within the pore of corrosion products. An evaluation of corrosion rates on the basis of this model exhibits rates similar to systems in practice.
    Notizen: Zur Klärung der Korrosionsvorgänge an Nickel-und Cobalt-gebundenem Wolframcarbid werden zwei Apparaturen nach dem Prinzip der rotierenden Scheibe eingesetzt, die den Einfluß der Korrosionsparameter Chloridkonzentration, Temperature und Strömungsgeschwindigkeit erfassen. Es wird gezeigt, daß durch die Kombination des kathodisch wirksamen WC mit der anodisch wenig stabilen Metallmatrix eine Sauerstoffkorrosion auftritt, für die der Begriff der inneren Kontaktkorrosion eingeführt wird. Diese innere Kontaktkorrosion läßt sich durch ein Porenmodell beschreiben, das am Grund der Pore aus dem metallischen Binder, an der Wand hauptsächlich aus WC und in der Pore aus Korrosionsprodukten besteht. Eine Abschätzung der Korrosionsraten auf der Basis dieses Modells ergibt Korrosionsraten in der Größenordnung der Werte aus der Praxis.
    Zusätzliches Material: 19 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/maco.19860370502
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 63
    Digitale Medien
    Digitale Medien
    Imaging of polymer surfaces using X-ray photoelectron spectroscopy (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 21 (1994), S. 79-86 
    Details
    ISSN: 0142-2421
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: Applications of x-ray photoelectron spectroscopy imaging in the analysis of heterogeneous polymer surfaces are evaluated using a sample containing tetrafluoroethylene plasma-deposited onto polyethylene. The C 1s and F 1s images acquired using non-monochromatic Mg Kα and monochromatic Al Kα x-ray sources are used to demonstrate good charge stabilization, as confirmed by small-area spectra. The use of non-monochromatic flood sources vs. monochromatic focused x-ray ray sources for image acquisition is discussed. The use of the valence band region for imaging is also demonstrated.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/sia.740210204
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 64
    Digitale Medien
    Digitale Medien
    Transcrystalline orientation in polymers (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 2195-2197 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1974.070180724
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 65
    Digitale Medien
    Digitale Medien
    NMR study of diffusion of butane in linear polyethylene (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 1399-1407 
    Details
    ISSN: 0098-1273
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The diffusion coefficient of butane in linear polyethylene at room temperature as a function of the vapor pressure of butane was measured by the spin-echo method with a pulsed magnetic field gradient. For the Special morphology of randomly oriented stacks of parallel lamellas the detour factor is 1/3. As long as the blocking factor and migration through the lamellas can be neglected, the local diffusion coefficient Da of the small molecules through the amorphous layers in the direction parallel to the lamellas is three times the apparent diffusion coefficient D derived from the decay of the amplitude of the spin echo under the assumption of an infinitely extended homogeneous medium. The diffusion coefficient and the spin-spin relaxation time both increase exponentially with increasing pressure, i.e., butane concentration in the polymer, while the spin-lattice relaxation time is pressure independent and seems to be determined by interaction with the amorphous polyethylene matrix.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1978.180160806
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 66
    Digitale Medien
    Digitale Medien
    NMR self-diffusion study of polyethylene and paraffin melts (1985)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 23 (1985), S. 387-404 
    Details
    ISSN: 0098-1273
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The self-diffusion coefficient D of paraffin and polyethylene melts - covering the range between N = 19 and 103 where N is the number of monomeric units - was measured by the pulsed-magnetic-field-gradient NMR method for diffusion times between 3 ms and 1 s. For the paraffins, D is proportional to N-2 though the molecular weights are smaller than the critical molecular weight for entanglement. In polyethylene, melts a strong dependence of the diffusion coefficient on the diffusion time is observed, whereas no such dependence is found in paraffin melts. A mathematical formalism for describing spin-echo attenuation in terms of a velocity autocorrelation function is shown to yield qualitative agreement with the experimental results.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1985.180230212
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 67
    Digitale Medien
    Digitale Medien
    Combined Cl and El mass spectra in the analysis of essential oils (1992)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 15 (1992), S. 510-513 
    Details
    ISSN: 0935-6304
    Schlagwort(e): GC-MS ; Cl ; El ; Flavors ; Cola beverages ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: As part of a study directed at introducing GMP recommendations to the production of non-alcoholic beverages, combined Cl and El mass spectra have been used for the identification of compounds present in extracts of “Cockta” beverage following GC-MS analysis. The amount of useful information present both in the separate Cl and El spectra, and in two of the possible combinations of the spectra, is described.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240150805
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 68
    Digitale Medien
    Digitale Medien
    Site-site interactions in a polymer matrix: The effect of polymer backbone structure on the transformation of crosslinked resins with substituted hydrazines (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 2325-2331 
    Details
    ISSN: 0887-624X
    Schlagwort(e): crosslinked copoly(styrene-p-nitrophenylacrylate) ; crosslinked chloromethylated polystyrene ; nucleophilic substitution ; site-site interactions ; substituted hydrazines ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Crosslinked chloromethylated polystyrene (1) and crosslinked copoly(styrene-p-nitro-phenylacrylate) (3) readily reacted with 1,1-dimethylhydrazine, but the course of the reaction was strongly dependent on the structure of the backbone. Monofunctionalization was observed with chloromethylated polystyrene (1) giving the 1,1,1-dimethylhydrazinium chloride derivative (2), while high degree of additional crosslinking took place with crosslinked copoly(styrene-p-nitrophenylacrylate) (3), and additional crosslinking was also observed in functionalization with N-aminopiperidine and N-aminomorpholine. The additional crosslinking suggested a higher backbone mobility in acrylate beads (3) compared to chloromethylated polystyrene (1). The type of transformation and the degree of additional crosslinking also depended on the starting crosslinking of copoly(styrene-p-nitrophenylacrylate) (3; 3a, 2% DVB; 3b, 4% DVB; 3c, 10% DVB). Replacement of p-nitrophenol groups in copoly(styrene-p-nitrophenylacrylate) (3) with hydrazino units resulted in enhanced swelling abilities of the hydrazine derivatives (4, 5, 6) in methanol, dimethylformamide, and chloroform, while formation of the hydrazinium chloride derivative (2) from chloromethylated polystyrene (1) caused enhancement of swelling in methanol but diminished it in toluene. The degree of crosslinking of copoly(styrene-p-nitrophenylacrylate) (3) also influenced the swelling abilities of 3 and its hydrazino derivatives, being higher with 2% cross-linked resins and lower with 4% and 10% crosslinked resins. © 1996 John Wiley & Sons, Inc.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
  • 69
    Digitale Medien
    Digitale Medien
    The role of multifunctionalized amine structure and reaction conditions on the transformations of crosslinked copoly(styrene-p-nitrophenylacrylate) (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 1699-1706 
    Details
    ISSN: 0887-624X
    Schlagwort(e): crosslinked copoly (styrene-p-nitrophenylacrylate) ; nucleophilic substitution ; primary amines ; diaminoalkanes ; amino alcohols ; amino acids ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Crosslinked copoly(styrene-p-nitrophenylacrylates), containing 2% (1) or 4% DVB (2) were converted with various diaminoalkanes (1,2-diaminoethane 3a, 1,4-diaminobutane 3b, 1,8-diaminooctane 3c) to amides. The degree of additional crosslinking depended on the chain length of the diaminoalkane, the molar ratio of ester function in 1 or 2 to diaminoalkane, solvent polarity (dimethylformamide, chloroform, toluene), while reaction temperature (50 or 100°C) had only a minor effect. 2 was also converted with various amines bearing additional functional groups (ethanolamine, 3-amino-1-propanol, 4-aminomethylpyridine, 2-(2-aminoethylamino)-ethanol, 2-(2-aminoethoxy)-ethanol, 6-aminocaproic acid, N-propylaminomorpholine, 3-N,N-diethylamino-1-propylamine) to the corresponding amides. The swelling ability of the resins depended on the crosslinking of the starting copoly(styrene-p-nitrophenylacrylate) (1, 2), the structure of the amide, the degree of additional crosslinking, and solvent polarity (chloroform, dimethylformamide, methanol, toluene). The accessibility of nitrogen atoms in the polymer matrix was examined by EtX functionalization of the 3-N,N-diethylamino-1-propylamine derivative (10) and 4-aminomethylpyridine derivative (13), and more than 85% functionalization was found. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 1699-1706, 1998
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
  • 70
    Digitale Medien
    Digitale Medien
    Novel method for the preparation of poly(urethane-imide)s and their properties (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 3745-3753 
    Details
    ISSN: 0887-624X
    Schlagwort(e): poly(urethane-imide) ; polyurethane ; polyimide ; poly(amide acid) ; oligo(amide acid) ; polyurethane prepolymer ; elastomer ; polymer network ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A polymer blend consisting of polyimide (PI) and polyurethane (PU) was prepared by means of a novel approach. PU prepolymer was prepared by the reaction of polyester polyol and 2,4-tolylenediisocyanate (2,4-TDI) and then end-capped with phenol. Poly(amide acid) was prepared from pyromellitic dianhydride (PMDA) and oxydianiline (ODA). A series of oligo(amide acid)s were also prepared by controlling the molar ratio of PMDA and ODA. The PU prepolymer and poly(amide acid) or oligo(amide acid) solution were blended at room temperature in various weight ratios. The cast films were obtained from the blend solution and treated at various temperatures. With the increase of polyurethane component, the films changed from plastic to brittle and then to elastic. The poly(urethane-imide) elastomers showed excellent mechanical properties and moderate thermal stability. The elongation of films with elasticity was more than 300%. The elongation set after the breaking of films was small. From the dynamic mechanical analysis, all the samples showed a glass transition temperature (Tg) at ca. -15°C, corresponding to Tg of the urethane component, suggesting that phase separation occurred between the two polymer components, irrespective of polyimide content. TGA and DSC studies indicated that the thermal degradation of poly(urethane-imide) was in the temperature range 250-270°C. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 3745-3753, 1997
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
  • 71
    Digitale Medien
    Digitale Medien
    Kurzreferate zu den Originalarbeiten (1971)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 22 (1971), S. I 
    Details
    ISSN: 0947-5117
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/maco.19710220118
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 72
    Digitale Medien
    Digitale Medien
    Deterioration of Electrical Equipment in Adverse Environments. Von M. R y c h t e r a. Academia-Verlag, Prag, 1970 (1971)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 22 (1971), S. 114-114 
    Details
    ISSN: 0947-5117
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/maco.19710220117
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 73
    Digitale Medien
    Digitale Medien
    Proton polarizability of poly(L-tyrosine)-hydrogen phosphate hydrogen bonds as a function of alkali cations (1984)
    New York : Wiley-Blackwell
    Biopolymers 23 (1984), S. 695-705 
    Details
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: We studied films of poly(L-tyrosine) with hydrogen phosphate (residue/phosphate, 1:1) by ir spectroscopy. The influences of the alkali cations (Li+, Na+, K+) and of the degree of hydration were clarified. If Li+ ions are present, the OH⃛-OP hydrogen bonds formed in the dried films between the tyrosine OH groups and hydrogen phosphate are asymmetrical. The formation of hydrogen phosphate-hydrogen phosphate hydrogen bonds is prevented by the presence of the Li+ ions. With an increase in the degree of hydration, the tyrosine-phosphate bonds are not broken but become slightly stronger. Completely different behaviour is found if K+ ions are present. In dry films, the OH⃛-OP ⇌ O-⃛HOP hydrogen bonds formed between tyrosine and hydrogen phosphate show large proton polarizability. The tyrosine proton has a noticeable residence time at the acceptor O atom of the phosphate. The difference in the behaviour of the system with K+ ions when compared to the system with Li+ ions can be explained, since the hydrogen acceptor O atom of phosphate ions is more negatively charged due to the weaker influence of the K+ ions. Furthermore, POH⃛-OP hydrogen bonds between hydrogen phosphate molecules are formed. With an increase in the degree of hydration, the tyrosine-hydrogen phosphate hydrogen bonds are broken, all tyrosine protons are found at the tyrosine residues, and the -PO3- groupings are in a symmetrical environment, indicating that the K+ ions are removed from these groupings. If the degree of hydration increases further, hydrogen-bonded systems such as hydrogen phosphate-water-hydrogen phosphate are formed that show large proton polarizability due to collective proton motion. When Na+ ions are present, the OH⃛-OP ⇌ O-⃛HOP hydrogen bonds formed in dry films still show proton polarizability, but the residence time of the tyrosine proton at the phosphate is very short.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bip.360230409
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 74
    Digitale Medien
    Digitale Medien
    Neuere Anwendungsmöglichkeiten von Epoxyharzen im Oberflächenschutz (1959)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 605-608 
    Details
    ISSN: 0947-5117
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Recent applications of epoxy resins to surface protectionAfter a brief reference to the importance of epoxy resins in the sphere of surface protection, the subject of solventfree epoxy resin/hardener systems is discussed on the strength of the latest practical experience, and illustrated by photographs concerned with laboratory research work and practical applications.
    Notizen: Nach einem kurzen Hinweis auf die Bedeutung der Epoxyharze im Oberflächenschutz wird das Gebiet der lösungsmittelfreien Epoxyharz-/Härter-Systeme an Hand neuester Praxiserfahrungen behandelt und mit Abbildungen über Laboruntersuchungen und Anwendungsbeispiele illustriert.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/maco.19590101002
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 75
    Digitale Medien
    Digitale Medien
    Modellierung der Toluoladsorption an wasserdampfregenerierten Aktivkohleschüttungen unter Berücksichtigung des Restbeladungsprofils (1995)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 67 (1995), S. 1205-1206 
    Details
    ISSN: 0009-286X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cite.3306709170
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 76
    Digitale Medien
    Digitale Medien
    Polarographic and electrochemical studies of some aromatic and heterocyclic nitro compounds, part I: General mechanistic aspects (1992)
    Weinheim : Wiley-Blackwell
    Electroanalysis 4 (1992), S. 783-794 
    Details
    ISSN: 1040-0397
    Schlagwort(e): Aromatic nitro compounds ; polagraphic mechanism ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Comparing reduction potentials of aromatic nitro compounds with those of corresponding nitroso compounds, by studying shifts of half-wave and peak potentials with pH and by following the decrease of limiting current in buffered 35% DMF-water mixtures, the sequence of protons and electrons in the four-electron reduction step was proved to be: H+, e, H+, e, 2e, 2H+. Arylhydroxylamines formed in the four-electron reduction of nitro compounds can be protonated and further reduced, they can undergo dehydration (provided that the dehydration product is stable), they can undergo chemical reactions with intermediates of the reduction of the nitro group, like ArNO\documentclass{article}\pagestyle{empty}\begin{document}$ \overline {\mathop 2\limits^.} $\end{document}, they can be electrooxidized to nitrosobenzenes (which can undergo chemical reactions) or they can react with carbonyl groups when present. Stabilization of the dehydrated form can occur in quinonemethide (nifedipine) or in some quinone-like heterocyclic derivatives. Side reactions of ArNHOH and ArNO are demonstrated by smaller peaks in CV and by controlled potential electrolysis. Reactions of ArNHOH with carbonyl groups were observed by formation of new waves of nitrones in the reduction of nitrobenzenaldehydes.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/elan.1140040808
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 77
    Digitale Medien
    Digitale Medien
    Polarographic and electrochemical studies of some aromatic nitro compounds: Part VIII. Effects of solvents and surfactants on current-voltage curves obtained with DC and differential pulse polarography (1995)
    Weinheim : Wiley-Blackwell
    Electroanalysis 7 (1995), S. 132-137 
    Details
    ISSN: 1040-0397
    Schlagwort(e): Differential pulse polarography ; Aromatic nitro compounds ; Surfactants ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Differential pulse polarography (DPP) is an excellent analytical method, but cannot be recommended for applications in the initial stages of mechanistic studies. Its application is also questionable in the analysis of samples containing varying concentrations of an organic cosolvent or of surface active compounds. The effect on limiting currents obtained by DC polarography and on peak currents obtained by DPP was demonstrated for reductions of various nitrobenzene derivatives. The similarity of changes in current for various nitrobenzenes enables the exclusion of the formation of adducts or micelles as the predominant effect. The decrease of the limiting currents in all cases is much smaller than the decrease of DPP peak currents, due to strong effects of the surfactants on the kinetics of electroreduction. For the analysis of natural products or of solutions containing varying amounts of organic cosolvent, the measurement of the DC polarographic limiting current is preferred. An addition of 30% ethanol minimizes the effects of the varying concentration of surfactant on both DC polarographic limiting and DPP peak currents.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/elan.1140070207
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 78
    Digitale Medien
    Digitale Medien
    Schwingungsverschleiß an TiB2-ZrO2 und TiC-ZrO2 oberflächenlegierter Al2O3-Keramik unter Variation der Luftfeuchte (1995)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 26 (1995), S. 394-402 
    Details
    ISSN: 0933-5137
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Oscillating sliding wear of TiB2-ZrO2 and TiC-ZrO2 surface alloyed Al2O3 ceramic at different humidityA commerical alumina ceramic was surface-alloyed by adding TiB2 and TiC in addition to ZrO2 using infrared CO2 laser radiation. Aside from the type of hard particles their volume fraction was varied between 6 and 31%. The average thickness of the alloyed surface layer was about 150 ¨m. Tribological tests were carried out unlubricated under oscillating sliding contact against alumina counterbodies at relative humidities of 3 and 50% as well as in distilled water.Ceramographic studies showed that multiphase structures containing hard particles of TiC or TiB2 embedded in the Al2O3 matrix were obtained by alloying. In addition Al-Zr-Ti-O complex phases were analyzed by using X-ray diffraction technique. Compared to the commercially available alumina ceramic A123, laser alloying reduced the friction coefficient and improved substantially the wear resistance under the applied conditions of tribological testing. It was found that tribological behaviour was strongly influenced by environmental humidity in addition to the effect of the type and volume fraction of the phases produced by alloying. The unalloyed alumina ceramic depended more sensitively on humidity than the alloyed ceramic.
    Notizen: Mit Hilfe infraroter Laserstahlung (λ = 10,6 m̈m) wurde eine handelsübliche Al2O3-Keramik durch TiB2 und TiC unter Zusatz von ZrO2 oberflächenlegiert. Neben der Art der Hartstoffe wurde ihr Volumenanteil zwischen etwa 6% und 31% variiert. Die mittlere Dicke der legierten oberflä chenschicht betrug 150 m̈m. Tribologische Versuche wurden ungeschmiert unter reversierender Gleitbeanspruchung gegen Al2O3-Gegenkörper bei 3% und 50% iger Luftfeuchte bzw. in destilliertem H2O durchgeführt.Die Untersuchungen zeigten, daß mehrphasige Gefüge mit eingelagerten Hartstoffteilchen vorlagen. Im Vergleich zu unlegierter, handelsüblicher Al2O3-Referenzkeramik konnte unter den gewählten tribologischen Bedingungen eine deutliche Reduzierung der Reibungszahlen und eine Erhöhung des Verschleißwiderstandes durch das variiertem Volumenanteils und der Art der Harstoffe trat eine wesentliche Abhängigkeit der tribologischen Eigenschaften von dem H2O-Gehalt der Umgebung auf. Unlegierte Al2O3-Keramik reagierte deutlich empfindlicher auf Änderungen der Umgebungsbedingungen als die legierten Keramiken.
    Zusätzliches Material: 12 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mawe.19950260713
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 79
    Digitale Medien
    Digitale Medien
    Trockener Gleitverschleiß an Ingenieurkeramiken und Stählen durch mineralische Stoffe (1988)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 19 (1988), S. 157-163 
    Details
    ISSN: 0933-5137
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Dry Sliding Wear of Engineering Ceramics and Steels in Contact with MineralsDry and unlubricated sliding wear against flint, corundum and silicon carbide was studied on oxide and non-oxide ceramics by using two different model systems at room temperature.-Wear behaviour of the ceramics was compared with that of steels and hard chromium coating. Type anß size of the abrasive minerals and the load were systematically varied. The results showed that wear resistance of the ceramics can be greater or smaller than that of the steels depending on the experimental conditions. Conclusions may be drawn for applications of modern engineering ceramics.
    Notizen: In zwei verschiedenen Modellsystemen wurde der trockene, ungeschmierte Gleitverschleiß oxidischer und nichtoxidischer keramischer Werkstoffe bei Beanspruchung durch Mineralstoffe, wie Flint, Korund und Siliciumcarbid, bei Raumtemperatur untersucht. Zu Vergleichszwecken wurden Stähle und Hartchromschichten mit in die Untersuchungen einbezogen. Variiert wurden die Art und Körnung der abrasiven Minerale sowie die Belastung. Die Ergebnisse zeigen, daß je nach experimentellen Bedingungen der Verschleißwiderstand der Keramiken über bzw. Unter dem der Stähle liegen kann. Hieraus ergeben sich Hinweise auf die Einsatzmöglichkeiten moderner Ingenieurkeramik.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mawe.19880190504
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 80
    Digitale Medien
    Digitale Medien
    Friction and wear of ZrO2-TiO2 surface-alloyed Al2O3 ceramics in unlubricated sliding contact (1994)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 25 (1994), S. 110-118 
    Details
    ISSN: 0933-5137
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Reibung und Verschleiß von ZrO2-TiO2 oberflächenlegierter AI2O3-Keramik im ungeschmierten GleitkontaktAl2O3-Keramiken mit unterschiedlicher Porosität wurden mit Hilfe von CO2-Laserstrahlung umgeschmolzen und durch Zusätze von ZrO2 und TiO2 oberflächenlegiert. Die legierten Oberflächenschichten wiesen Dicken von etwa 200 m̈m und etwa 31 vol.% an ZrO2- und TiO2-reichen Phasen auf. Die zweiten Phasen waren homogen in der Oberfläche verteilt und bildeten sich bevorzugt an den Korngrenzen der α-A12O3-Matrix. Elektronenmikroskopische und EDX-Analysen wurden and den Legierungsschichten und den verschlissenen Oberflächen vorgenommen. Tribologische Versuche wurden ungeschmiert unter Bedingungen des Furchungsverschleißes gegen SiC-Abrasivstoff und des Schwingungsverschleißes gegen Al2O3 in Labortribometern durchgeführt.Die Ergebnisse zeigten, daß mittlere Korngröße und die Härte in den legierten Oberflächen geringer, die Zähigkeit jedoch größer war. Die Ausgangsporosität der Keramiken beeinflußte deutlich die tribologischen Eigenschaften. Durch die Laserbehandlung wurde die Porosität beseitigt oder bei der hochporösen Al2O3-Keramik bis auf eine geringe Restporosität reduziert. Die Untersuchungen zeigten, daß Oberflächenlegieren von Al2O3-Keramik eine effektive Technologie darstellt, um Bauteile mit unterschiedlichen Oberflächen- und Volumeneigenschaften sowie im vorliegenden Fall mit stark verbesserten tribologischen Eigenschaften herzustellen. Hierbei konnte unter den gewählten Bedingungen besonders der Verschleißwiderstand erhöht werden.
    Notizen: Slightly and highly porous Al2O3 ceramics were surface remelted and alloyed by adding ZrO2 and TiO2 using infrared CO2 laser radiation. The resulting composite layers of thickness of about 200 m̈m contained about 31 vol.% of ZrO2- and TiO2-rich phases which were homogeneously distributed at the grain boundaries of the alumina matrix. Microstructures and worn surfaces were analysed by electron microscopy and EDX analysis. Tribological tests were carried out unlubricated using conditions of abrasive wear and oscillating slinging wear, respectively.The results showed that the average grain size and hardness of the ceramics were reduced due to alloying. Despite decreasing hardness the wear resistance was substantially increased. Friction and wear of the untreated ceramics depended strongly on the amount of porosity which was removed or substantially reduced by laser treatment. Surface alloying of Al2O3 ceramics can offer an effective process for producing components showing very different surface and bulk properties and particularly improved tribological behaviour. For the alloying elements and experimental conditions used, the improvement was more pronounced in wear resistance than in friction coefficient.
    Zusätzliches Material: 12 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mawe.19940250307
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 81
    Digitale Medien
    Digitale Medien
    Entwicklung und Einsatz verschleißfester WerkstoffeVortrag, gehalten anläßlich der Berliner Werkstoff-Tage 1987 und veröffentlicht in der Zeitschrift der Förderer des Bergbaus und des Hüttenwesens an der Technischen Universität Berlin e. V., Heft Nr. 2/1987 - Nr, 1/1988, S. 33-39; publiziert mit freundlicher Genehmigung der Veranstalter. (1988)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 19 (1988), S. 223-230 
    Details
    ISSN: 0933-5137
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Zusätzliches Material: 15 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mawe.19880190704
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 82
    Digitale Medien
    Digitale Medien
    Optimization of Focused Microwave-Assisted Extraction of DDT and Derivatives from Soil Samples (2000)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 23 (2000), S. 681-687 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Focused microwave assisted extraction ; close microwave-assisted extraction ; DDT ; soil samples ; experimental design ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---Optimization of focused microwave (FMW)-assisted extraction of 4,4′-DDE, 4,4′-DDD, and 4,4′-DDT from soil samples was carried out using central composite designs. All the extracts were analyzed with GC/MS and some of them also with GC/AED using columns of different polarities for each of the techniques. The extraction of the analytes was carried out in two ways: with acetic acid as microwave radiation absorbent solvent and n-decane to concentrate the analytes and with reagent water and iso-octane as solvents. In the first case, the influence of the extraction temperature, the extraction time, and the addition of sodium chloride were studied and the optimum conditions for the extraction of 1 g of soil with 5 mL of acetic acid and 2 mL of n-decane were 1.30 mol L-1 sodium chloride at 98°C for 9.3 min. In the second case, the temperature was kept constant (94°C) and the influence of the concentration of sodium chloride and the extraction time were studied. The optimum conditions were 5 mL of a 2.0 mol L-1 sodium chloride together with 2 mL of iso-octane for 15 min. The recoveries obtained by water-FMW extraction were significantly lower than those obtained by the acetic acid-FMW procedure. These last recoveries were in good agreement with those obtained by closed microwave assisted-extraction with acetone-n-hexane as solvent.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
  • 83
    Digitale Medien
    Digitale Medien
    Polyurethane networks based on poly(ethylene oxide) (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 49 (1993), S. 2055-2063 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: A wide range of infinite urethane polymer networks were prepared from poly(ethylene glycol) (PEG) and hexamethylene diisocyanate (HMDI) using 1,1,1-tris-(hydroxymethyl) ethane (THME) as the cross-linking agent. The influence of temperature, cross-linking, and crystallinity on the swelling character of the hydrogel has been discussed. The toxicity of the network polymer by intravaginal implants in rats was studied. Implantation of the polymer did not result in alteration in behavior and feed intake or any pathological changes in the tissue. Vaginal fluids from the polymer-implanted rats or the polymer extract when inoculated on a listeria monocytogene culture plate were unable to inhibit the bacterial growth. © 1993 John Wiley & Sons, Inc.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1993.070491201
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 84
    Digitale Medien
    Digitale Medien
    Release of tritium-labeled estradiol steroids from fully swollen hydrogels of polyurethane networks (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 51 (1994), S. 2001-2005 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Diffusion of uniformly dispersed tritium-labeled estradiol in water-swollen poly(ethylene oxide) -based hydrogels was studied by assaying the release of solute from cylindrical hydrogels into a finite volume of solution at 37°C. Fractional release followed a t0.5 relationship for a range of radil between 0.20 and 0.35 cm and different polymer compositions with equilibrium water uptake of 220-750 parts per hundred dry polymer. Values of the diffusion coefficient were calculated from the fully swollen hydrogels, which represents the swelling and release profile quite accurately. © 1994 John Wiley & Sons, Inc.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1994.070511203
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 85
    Digitale Medien
    Digitale Medien
    Release of radioactive steroids from dried down hydrogels of polyurethane networks (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 55 (1995), S. 1301-1305 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The polyurethane networks were based on poly(ethylene glycol) 6000 (PEG), crosslinked with 1,1,1-tris(hydroxy methyl)ethane and with the stoichiometric equivalence of hexamethylene diisocyanate. Radioactive steroids were incorporated into cylindrical hydrogels over a wide range of compositions. The release profiles were drawn from dried down hydrogel of polyurethane networks. The scintillation counter was used for the release study of steroids after different intervals. In vivo, the loaded hydrogels were implanted into rats. The results for constant release studies were recorded. © 1995 John Wiley & Sons, Inc.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1995.070550903
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 86
    Digitale Medien
    Digitale Medien
    A tubular graphite-epoxy electrode incorporating horseradish peroxidase as a potentiometric sensor for hydrogen peroxide (1995)
    Weinheim : Wiley-Blackwell
    Electroanalysis 7 (1995), S. 722-725 
    Details
    ISSN: 1040-0397
    Schlagwort(e): Biosensor ; Graphite epoxy ; Peroxidase ; Hydrogen peroxide ; Flow injection analysis ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A novel potentiometric peroxidase enzyme sensor based on a tubular graphite-epoxy design is reported for the determination of hydrogen peroxide in an FIA system. The sensor was formed from horseradish peroxidase (40 mg), graphite (240 mg) and epoxy (780 mg). Hydrogen peroxide, injected into pH 7,0.05 M phosphate buffer at 26°C, was determined with a linear slope of 45.6 mV/decade in the concentration range 7.5 × 10-7 to 5.0 × 10-5 M. Acceptable reproducibility of 1.2% relative standard deviation was obtained in the flow injection analysis. The advantages of this sensor are low cost, simple electronic circuit design and better selectivity than amperometric sensors and a detection limit comparable with other methods.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/elan.1140070805
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 87
    Digitale Medien
    Digitale Medien
    Identification of phenol-formaldehyde resins by gas chromatographic analysis of their pyrolysis products (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 4 (1966), S. 567-572 
    Details
    ISSN: 0449-2986
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1966.110040811
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 88
    Digitale Medien
    Digitale Medien
    Enantiomeric resolution of α-pinene by HPLC with a chiral mobile phase additive (1991)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 14 (1991), S. 361-362 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Enantioseparation of α-Pinene ; Chiral mobile phase additive ; Cyclodextrins ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240140516
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 89
    Digitale Medien
    Digitale Medien
    Separation of monoterpene hydrocarbon enantiomers via complexation with α-cyclodextrin in RP-HPLC (1993)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 16 (1993), S. 505-507 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Enantioseparation of monoterpenes ; Cyclodextrins ; Chiral mobile phase additive ; UV-indirect detection ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240160814
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 90
    Digitale Medien
    Digitale Medien
    Two-layer modeling of smoke movement in building fires (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 4 (1980), S. 17-27 
    Details
    ISSN: 0308-0501
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Maschinenbau
    Notizen: A description is given of a model which predicts the motion of combustion products and fresh air caused by a fire located in one room of a two-room structure. The gas in each room is assumed to be divided into two homogeneous layers, a layer next to the ceiling which contains hot combustion products and one next to the floor which contains fresh air. The model predicts the motion of the interface separating these layers and the density of the hot layers as a function of time and an arbitrarily specified fire heat release rate.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/fam.810040103
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 91
    Digitale Medien
    Digitale Medien
    Development of a stratified ceiling layer in the early stages of a closed-room fire (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 2 (1978), S. 54-62 
    Details
    ISSN: 0308-0501
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Maschinenbau
    Notizen: A simple analytical model has been developed to determine the time required for a room to fill with products of combustion from a small fire. The room is assumed to be closed except for small openings at either the floor or ceiling level and the assumption is made that the leak is large enough to allow the transient pressure term in the energy equation to be neglected. Products of combustion are assumed to occupy a layer next to the ceiling and the model predicts the growth of the thickness and the mean density of this layer as a function of time. The analysis shows that times required to fill a typical room are small. For example, a typical bedroom fills with products from a 20 kW fire in several minutes. The time required to fill a room and the mean density of ceiling layer are determined in terms of fire size, room geometry, leak position, fire elevation and geometry.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/fam.810020203
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 92
    Digitale Medien
    Digitale Medien
    Plastics engineering handbook of the society of the plastics industry, Inc., 3rd ed. A. F. Randolph, Ed. Reinhold, New York, 1960. lii + 565 pp. $15.00 (1960)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 4 (1960), S. 125-125 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1960.070041026
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 93
    Digitale Medien
    Digitale Medien
    Nature and properties of engineering materials. Z. D. Jastrzebski. Wiiey, New York-London, 1959, xvii + 571 pp. $11.00 (1960)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 4 (1960), S. 372-373 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1960.070041224
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 94
    Digitale Medien
    Digitale Medien
    Torsional braid analysis of the aromatic amine cure of epoxy resins (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 53 (1994), S. 429-440 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The cure behavior of diglycidyl ether of bisphenol A (DGEBA) type of epoxy resins with three aromatic diamines, 4,4′-diaminodiphenyl methane (DDM), 4,4′-diaminodiphenyl sulfone (44DDS), and 3,3′-diaminodiphenyl sulfone (33DDS) was studied by torsional braid analysis. For each curing agent the stoichiometry of the resin mixtures was varied from a two to one excess of amino hydrogens per epoxy group to a two to one excess of epoxy groups per amino hydrogen. Isothermal cures of the resin mixtures were carried out from 70 to 210°C (range depending on epoxy - amine mixture), followed by a temperature scan to determine the glass transition temperature (Tg). The times to the isothermal liquid-to-rubber transition were shortest for the DDM mixtures and longest for the 44DDS mixtures. The liquid-to-rubber transition times were also shortest for the amine excess mixtures when stoichiometry was varied. A relatively rapid reaction to the liquid-to-rubber transition was observed for the epoxy excess mixtures, followed by an exceedingly slow reaction process at cure temperatures well above the Tg. This slow process was only observed for epoxy excess mixtures and eventually led to significant increases in Tg. Using time - temperature shifts of the glass transition temperature vs. logarithm of time, activation energies approximately 50% higher were derived for this process compared to those derived from the liquid-to-rubber transition. The rate of this reaction was virtually independent of curing agent and was attributed to etherification taking place in the epoxy excess mixtures. © 1994 John Wiley & Sons, Inc.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1994.070530406
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 95
    Digitale Medien
    Digitale Medien
    Effects of aluminum oxide surfaces on epoxy cure reactions (1991)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 17 (1991), S. 530-532 
    Details
    ISSN: 0142-2421
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/sia.740170722
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 96
    Digitale Medien
    Digitale Medien
    Numerical Simulation of Penetration by explosively-formed projectiles (1993)
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 18 (1993), S. 259-263 
    Details
    ISSN: 0721-3115
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Numerical solution techniques have advanced to the point where calculations of explosively-formed penetrator formation and penetration can be performed as a matter of routine on current wave propagation computer codes, popularly known as hydrocodes. Results, however, depend to a very large extent on the experience of the code user and familiarity with the capabilities and eccentricities of the particular code used for simulations. In this paper we look at the effects of spatial resolution and material strength on the simulation of penetration of thick mild steel plates by an explosively-formed penetrator of Armco iron. For good correlation with experiments, careful attention must be paid to the details of the computational grid. Likewise, material data must be determined from experiments appropriate for the range of strain rates encountered in the impact event.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prep.19930180505
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 97
    Digitale Medien
    Digitale Medien
    Vibrational CD studies of the solution conformation of simple alanyl peptides as a function of pH (1989)
    New York : Wiley-Blackwell
    Biopolymers 28 (1989), S. 2025-2044 
    Details
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The CH-stretching vibrational CD (VCD) spectra of glycyl-L-alanine, L-alanylglycine, and L-alanyl-L-alanine have been studied at neutral, high, and low pH in D2O solution. The intense positive VCD band attributed to the CαH stretch of the alanyl residue in glycyl-L-alanine at neutral pH is absent in L-alanylglycine. In contrast to the VCD spectra of L-alanine, the positive methine-stretching VCD band in glycyl-L-alanine and L-alanyl-L-alanine is still present at pH 2. Based on the ring current mechanism, the VCD spectra are consistent with the presence of a five-membered CO … HN intramolecular hydrogen-bonded ring between the C-terminal carboxylate and peptide NH groups at neutral and high pH, and a seven-membered COH … O=C hydrogen-bonded ring between the C-terminal carboxyl OH and peptide C=O groups at low pH. In the N-terminal alanyl residue, the peptide C=O group is hydrogen bonded to the NH trans to the methine bond. The CH-stretching VCD spectra of L-alanyl-L-alanyl-L-alanine at neutral pH are consistent with two intramolecularly hydrogen-bonded conformations for the central alanyl residue.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bip.360281116
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 98
    Digitale Medien
    Digitale Medien
    Modifikation des polychloropren-kautschuks durch aminierung (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 2147-2152 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1975.021760721
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 99
    Digitale Medien
    Digitale Medien
    A study of the cationic solid-state polymerization of 1,3,5-trithiane (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 17 (1979), S. 2233-2240 
    Details
    ISSN: 0360-6376
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The effect of various reaction parameters, such as temperature, catalyst, and concentration, on the cationic-initiated polymerization of 1,3,5-trithiane in solid state was studied and the apparent activation energies were estimated. A simple mathematical formula to describe the observed kinetic curves is proposed. The features observed are interpreted in terms of disordering a crystal structure during polymerization.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1979.170170730
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 100
    Digitale Medien
    Digitale Medien
    Einfluß der Natur der Phasengrenzfläche und des Emulgatortyps auf die Größenverteilung der LatexteilchenVortrag auf dem Internationalen Symposium „Polymerdispersionen“ unter Schirmherrschaft der IUPAC vom 4. bis 6. September 1978 in Dresden/DDR (1979)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 503-506 
    Details
    ISSN: 0323-7648
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: The particle size distribution in latices obtained in emulsion polymerization of monomers having different polarity in the presence of ionogenic and non-ionogenic emulsifiers has been investigated. The formation of latex particles and their polydispersity is caused by adsorption processes at the phase interface. The period of time required for achieving the critical value of unsaturated surface per unit volume of the system is suggested to be the main factor responsible for the shape of the particle size distribution.
    Notizen: Die Größenverteilung von Latexteilchen bei der Emulsionspolymerisation von Monomeren, die sich in ihrer Polarität unterscheiden, wurde in Gegenwart eines ionogenen und eines nichtionogenen Emulgators untersucht, Es wurde festgestellt, daß die Bildung von Latexteilchen und ihre Polydispersität durch Adsorptionsprozesse an der Phasengrenzfläche bestimmt werden. Es wird angenommen, daß die Zeitdauer bis zum Erreichen einer kritischen Größe der ungesättigten Oberfläche pro Volumeneinheit des Systems der Hauptfaktor ist, der für die Breite der TeilchenGrößenverteilung verantwortlich ist.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/actp.1979.010300808
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...