ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Polymer and Materials Science  (8,528)
  • 1
    Electronic Resource
    Electronic Resource
    Langmuir-Blodgett films of indandione-1,3 pyridinium betaine. III: Linear dichroism and non-linear optical properties (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 6 (1996), S. 39-50 
    Details
    ISSN: 1057-9257
    Keywords: amphiphilic indandione-1,3 pyridinium betaine ; Langmuir-Blodgett films ; monolayers ; linear dichroism ; non-linear optical properties ; second-harmonic generation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Linear dichroism and second-harmonic generation (SHG) have been measured in Langmuir-Blodgett (LB) multilayers of Z-type structure of amphiphilic indandione-1,3 pyridinium betaine (IPB) with an aliphatic tail containing 17 carbon atoms (C17IPB). The dichroic ratio As/Ap of electronic absorption of s- and p-polarised light and the SHG intensity show that the ‘heads’ of C17IPB molecules are predominantly oriented along the deposition direction of monolayers on a quartz substrate. Orientation parameters and mean statistical azimuthal and tilt angles are evaluated as a function of the number of monolayers. The SHG efficiency has been measured in C17IPB monolayers on a water surface as a function of surface pressure. The effective hyperpolarisability β of the IPB molecule has been determined experimentally in a chloroform solution by the hyper-Rayleigh-scattering method. The obtained value of β = (138 ± 16) × 10-30 esu is in good agreement with theoretical estimates.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Mikrophasen und LC-strukturen von aliphatischen blockcopolyethern in gegenwart von wasserVortrag anläßlich der Tagung der Fachgruppe “Makromolekulare Chemie” der Gesellschaft Deutscher Chemiker über “Polymere und Wasser” am 2. und 3. April 1984 in Bad Nauheim (1984)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 123 (1984), S. 189-216 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Blockcopolyethers of ethylene oxide (EO) and propylene oxide (PO) are molecular homogeneous in the dry state. When water is added most of it is physically bonded to the EO blocks. This leads to a considerable increase of the viscosity. At higher water concentrations the system forms a thermoreversible gel. It could be demonstrated by quantitative Small Angle X-Ray Scattering that a progressive microphase separation takes place. In this process a stochimoetric 1 : 1-complex of ethylene oxide and water plays an important role. The gelation ist correlated with the appearance of a lamellar order, i.e. an amphiphilic liquid crystalline phase. This long range supermolecular structure has to be regarded as the reason for the elastic behavior of the systems at high water concentrations.
    Notes: Blockcopolyether aus Ethylenoxid (EO) und Propylenoxid (PO) bilden im wasserfreien Zustand einphasige Systeme. In Gegenwart von Wasser findet eine weitgehend selektive Solvatisierung der EO-Blöcke statt. Diese führt zu einem starken Viskositätsanstieg und bei höheren Wassergehalten zur Bildung eines thermoreversiblen Gels. Durch quantitative Röntgenkleinwinkelmessungen konnte gezeigt werden, daß sich mit steigendem Wassergehalt in zunehmendem Maße eine Mikrophasenbildung vollzieht, wobei dem 1 : 1-Komplex aus Ethylen-oxid und Wasser eine besondere Bedeutung zukommt. Die Gelbildung ist verknüpft mit dem Auftreten einer lamellaren Struktur, die eine amphiphile LC-Phase darstellt. Diese weitreichende übermolekulare Ordnungsstruktur ist als Ursache für die elastischen Eigen-schaften solcher Systeme anzusehen.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1984.051230108
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Effect of crystallinity on the properties of nylons (1956)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 21 (1956), S. 189-204 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Increasing the degree of crystallization of unoriented 66 or 610 nylon increases the stiffness, yield point, tensile strength, and hardness, but reduces the impact strength, particularly in the high crystallinity range. The impact strength was increased by increasing the molecular weight, but the other properties were substantially unchanged. The effect of varying water content was independent of the effect of varying crystallinity and generally acts in the opposite direction.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1956.120219803
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    A surface study of the chemical pretreatment before coil coating of hot dip zinc-coated steel (1992)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 19 (1992), S. 121-126 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Zinc-coated steel strip is painted in coil-coating plants in order to improve corrosion resistance and to provide a decorative surface. We have used Auger and x-ray photoelectron spectroscopy to characterize the conversion coating formed during pretreatment of hot dip zinc-coated steel prior to coil coating. The pretreatment process includes alkaline cleaning of the strip, alkaline oxidation and a chromic acid after-rinse treatment. The composition and the chemical state of the surface have been examined after the different pretreatment steps.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740190124
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Silica coatings on α-alumina particles: Analysis and deposition mechanism (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 14 (1989), S. 46-52 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Coatings are applied to particulate materials to enhance surface properties while retaining desired bulk properties. Characterization of such coatings presents a challenge. In this paper we present an example of a particle surface analysis and assess how factors such as roughness and coating thickness distributions affect quantitative conclusions. Silica coatings were deposited from aqueous solution on to α-alumina particles of 150 nm average size. Transmission electron microscopy, x-ray photoemission spectroscopy and secondary ion mass spectrometry/depth profiling were used to analyze coatings of thicknesses of tens of nanometers to submonolayer. The three techniques were in excellent agreement in the thickness ranges where they overlapped. XPS does not allow assessment of the uniformity or thickness distribution of the coatings. However, depth profiles are quantitatively consistent with a model of random attachment of the silica units to the particle surface during growth, with no preference for the uncoated alumina surface over the previously deposited silica.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740140111
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Phase behaviour of block-polyampholytes based on poly(methacrylic acid)-block-poly(1-methyl-4-vinylpyridinium chloride) in aqueous salt solutions (1992)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 13 (1992), S. 225-229 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1992.030130407
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Study of cryostructurization of polymer systems. VIII. Characteristic features of the formation of crosslinked poly(acryl amide) cryogels under different thermal conditions (1989)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 8-15 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Der Einfluß des Gefrierregimes der Lösung der Ausgangssubstanzen (Acrylamid, N,N′-Methylen-bis-acrylamid, radikalischer Initiator) auf die Dynamik der Gelbildung und auf die Eigenschaften der erhaltenen Cryogele wurde untersucht. Die Abschreckmethode, die im schnellen Abkühlen auf tiefe Temperaturen mit nachfolgender Erwärmung auf die festgelegte Temperatur der Cryosynthese besteht, ergibt im Vergleich zum üblichen einstufigen Gefrierverfahren eine geänderte Makrostruktur der Cryogele und eine unterschiedliche Dynamik der Gelbildung.
    Notes: The influence of the freezing procedure of the solution of initial reactants (acrylamide, N,N′-methylene-bis-acrylamide, radical polymerization initiator) on the dynamics of gel formation and on the properties of the obtained cryogels was investigated. The quenching technique which consists in rapid deep freezing with following heating of the reaction mixture to the preassigned cryosynthesis temperature, results in another macrostructure of the cryogel and differences in the dynamics of gel formation as compared with the usual one-step freezing method.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1989.010400103
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Die Rolle der Endgruppen bei der Herstellung, Verarbeitung und Reibung von graphitgefüllten Poly(phenylchinoxalin)en (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 607-612 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The effect of terminal groups on the properties of composites on the basis of poly(phenylquinoxaline) (PPQ) and graphite has been studied by sedimentation analysis, viscosimetry, and mass spectrometry. The deviation from equimolarity druing the synthesis of PPQ without the filler leads to the formation of linear macromolecules with a wide range of molecular masses. The presence of the filler neither affects macromolecular branching during the synthesis, nor the crosslinking and grafting of polymer chains onto the graphite surface. PPQ composites with amino groups at the ends of the macromolecules are characterized by higher wear resistances and smaller friction coefficients than those with keto group or both keto and amino groups. The best tribochemical properties are obtained with PPQ composites syntehsized in the presence of excess tetramine with benzyl substituted terminal amino groups.
    Notes: Mittels Sedimentation, Viskosimetrie und Massenpektrometrie wurde der Einfluß der Endgruppen auf die Eigenschaften von Polymerkompositionen auf der Basis von Poly(phenylchinoxalin)en (PPC) und Graphit untersucht. Die Synthese von PPC führt bei nichtäquimolarem Verhältnis der Ausgangskomponenten ohne Füllstoff zu linearen Makromolekülen mit breiter Molmassenverteilung. Auch der Zusatz des Füllstoffs bewirkt weder Verzweigung der Makromoleküle noch Vernetzung und Propfung der Polymerketten auf die Graphitoberfläche. Die Untersuchung der tribochemischen Eigenschaften der komposite zeigt, daß die mit Aminogruppen terminierten PPC im Vergleich zu mit Carbonylgruppen terminierten eine höhere Verschleißestigkeit und einen niedrigeren Reibungskoeffizienten aufweisen. Die besten Werte liefern PPC-Komposite, die mit einem Überschuß an Tetramin synthetisiert und deren Aminoendgruppen durch Reaktion mit Benzil verkappt wurden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010421118
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Einfluß des Füllstoffs auf die Molmassenverteilung und die Topologie der Poly(phenylchinoxalin)-Makromoleküle in den Synthese- und Verarbeitungsprozessen (1988)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 39 (1988), S. 448-452 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Molecular weight distribution and topology of poly(phenylquinoxaline) macromolecules obtained by low-temperature polycondensation of 1,4-bis(phenylglyoxalyl)-benzene with 3,′3,4,′4-tetraaminodiphenyl oxide in chloroform in the presence of methanol (10 vol.%) or without it were determined by sedimentation, ebullioscopy and viscosimetry. In the presence of graphite in the polycondensation mixture, branched poly(phenylquinoxaline) molecules are formed that are distinguished by low degree of branching. When subjected to thermal treatment, a significant part of the polymer remains on the graphite surface, whereas the extracted sol-fraction shows an increased degree of branching as compared to the initial polymer.
    Notes: Mittels Sedimentation, Ebullioskopie und Viskosimetrie wurde die Molmassenverteilung und Topologie von Poly-(phenylchinoxalinen) bestimmt, die durch Niedertemperatur-Polykondensation von 1,4-Bis(phenylglyoxyloyl)benzen mit 3,′3,4,′4-Tetraaminodiphenylether in Chloroform mit und ohne Zusatz (10 Vol.-%) von Methanol gewonnen wurden. In Gegenwart von Grahpit entstehen verzweigte Poly(phenylchinoxalin)-Moleküle mit einem niedrigen Verzweigungsgrad. Bei thermischer Behandlung verbleibt ein merklicher Teil des Polymers auf der Graphitoberfläche, und die extrahierte Fraktion weist im Vergleich zum Ausgangspolymer einem höheren Verzweigungsgrad auf.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1988.010390815
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Über die quantitative Zusammensetzung der Pyrolyseprodukte beim thermischen Abbau halogenhaltiger Polyamidfasern (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 264-266 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The volatile degradation products of copolymers of polycaproamide containing chlorine and bromine were investigated by mass spectroscopy and pyrolysis/gas chromatography. The chemical structure of the copolymers was found to affect the quantitative separation of halogenes and ε-caprolactame as well as the degradation temperature. In thermal degradation of various copolymers the separation of H2O, CO2, CO, CH4, HCN, toluene and benzene was determined quantitatively.
    Notes: Für die Untersuchung von flüchtigen Abbauprodukten chlor- und bromhaltiger Copolymere des Polycaproamids wurden die Massenspektrometrie und Pyrolyse-Gaschromatographie verwendet. Es wurde gezeigt, daß die chemische Struktur des Copolymers einen Einfluß auf die quantitative Abspaltung von Halogenen und ε-Caprolactam sowie auf die Zersetzungstemperatur des Copolymers hat. Beim thermischen Abbau verschiedener Copolymere wurde die Temperaturabhängigkeit der Abspaltung von H2O, CO2, CO, CH4, HCN, Toluen und Benzen quantitativ bestimmt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1980.010310411
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...