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
  • 1
    Electronic Resource
    Electronic Resource
    Absorption spectra of charged oligo (phenylenevinylene)s: On the detection of polaronic and bipolaronic statesThe authors thank Prof. N. Tyutyulkov (Sofia) for helpful discussions and Dr. A. Grezner (Marburg) for making availabie unpublished results. (1991)
    Weinheim : Wiley-Blackwell
    Advanced Materials 3 (1991), S. 492-493 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19910031007
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Inhibitoren der Korrosion 25(1) - Über die Rolle der Kationen in Neutralsalzen bei der Korrosion von Eisenwerkstoffen in Gegenwart von SauerstoffHerrn Kollegen H. Hartmann, Institut für Physikalische Chemie der Universität Frankfurt/M., in langjähriger kollegialer Verbundenheit zum 65 Geburtstag gewidmet (1979)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 413-417 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion inhibitors 25(1) - The role of the cation in a neutral salt in the corrosion of iron in the presence of oxygenThe rate of uptake of oxygen, under standard conditions, in the corrosion of 500 mg DAB6 iron powder is dependent on the nature of the cation in a neutral salt (chloride). In the presence of alkali, quaternary ammonium, quaternary phosphonium and alkali-earth chlorides, the rate of oxygen uptake is comparable. With zinc, cadmium, nickel and cobalt chlorides a marked decrease in the oxygen uptake is observed between pH5 and pH7. This is probably due to a block in the cathodic area in the iron boundary layer through precipitation of the rather insoluble basic hydroxides of zinc, cadmium, nickel and cobalt.
    Notes: Die Geschwindigkeit des Sauerstoffverbrauchs bei der Korrosion von jeweils 500 mg DAB6-Eisenpulver wird in Abhängigkeit von der Art des Kations in Neutralsalzen (Chloriden) unter Standardbedingungen bestimmt. In Gegenwart von Alkali-, Quartären Ammonium, Quartären Phosphonium-und Erdalkalichloriden ist die Geschwindigkeit des Sauerstoffverbrauches vergleichbar groß. Mit Zink-, Cadmium-, Nickel-und Kobaltchloriden wird aber im Bereich von pH5 bis pH7 eine überraschend große Verzögerung der Sauerstoffaufnahme beobachtet. Es handelt sich mit hoher Wahrscheinlichkeit um eine Blockade der kathodischen Bezirke in der Eisengrenzfläche durch Abscheidung der schwerlöslichen basischen Hydroxyde von Zink, Cadmium, Nickel und Kobalt.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19790300602
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Blue light-emitting diodes based on ladder polymers of the PPP type (1994)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 45 (1994), S. 244-247 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The blue emission of ladder-type poly(para-phenylene) films is unstable under heat treatment due to the formation of aggregates that emit yellow light. Novel statistical copolymers possessing ladder-type oligo(para-phenylene) segments connected via twisted phenylene spacers are used to suppress the formation of these aggregates and to obtain blue emission stable under annealing.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1994.010450316
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Scaling limits of the glass transition in poly(vinyl chloride) (1979)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 540-546 
    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: Im Rahmen einer Scaling-Konzeption des Glasüberganges wird der Scalingbereich durch des übergangsgebiet des Logarithmus des Schermoduls gekennzeichnet. Die verschiedenen reduzierten Volumina werden nebeneinander in ein lg v-T-Diagramm abgebildet und können durch eine Schar von WLF-Kurven mit gemeinsamen Asymptoten beschrieben werden. Am Glasübergang wurden verschiedene Signale mittels dynamischer, thermischer und magnetischer Kernresonanz-Experimente an einer Suspensions-PVC-Probe in einem Frequenzgebiet von 10-4 bis 10+8 Hz gemessen. Unter Vernachlässigung jeglicher Reduktion der Signalhöhen wurde ein allgemeines Masterkurven-Diagramm entwickelt. Die NMR-Signale entsprechen annähernd der unteren, die thermischen Signale annähernd der oberen Scalinggrenze. Die beiden Grenzvolumina als Funktion der Temperatur sowie die mittlere Scherwinkelfluktuation werden abgeschätzt. Die β-Relaxation erreicht die untere Scalinggrenze des Glasüberganges bei einer Temperatur von (150 ± 10)°C und einer Frequenz von 10 (7,3 ± 0,5) Hz. Die Beziehungen zwischen beiden Relaxationserscheinungen werden diskutiert.
    Notes: Within a scaling concept of glass transition interval of the logarithm of shear modulus indicates the scaling region, the different reduced volumes of which are mapped into a logarithm frequency-temperature-plot side by side and can be described by a set of WLF curves with the same asymptotes. Different signals at the glass transition from dynamic, thermic, and nuclear magnetic resonance (NMR) experiments are measured in a suspension poly(vinyl chloride) sample in an overall frequency diapason from 10-4 to 10+8 Hz. Neglecting any reduction of signal height a general master curve diagram for all signals is sketched. NMR signals roughly correspond to the lower and thermic bulk signals correspond to the upper scaling limit, the latter is given by cooperatively rearranging regions with dimensions of some nm. The volumes at the both limits as functions of temperature and the mean shear angle fluctuation are estimated. The β relaxation reaches the lower scaling limit of the glass transition at a temperature of (150 ± 10)°C and at a frequency of 10(7,3 ± 0,5) Hz. The relationships between both relaxations are discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1979.010300902
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Molekülbewegung in Polyvinylchlorid mit kernmagnetischen Impulsverfahren (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 41-46 
    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: Measurements of nuclear magnetic relaxation times T1, T1ϱ, T2e and T2 of PVC were realized using different pulse methods in a region from 123 K up to 573 K. The variation of several parameters of experiments allows the determination of characteristic frequencies of molecular reorientation. The WLF-plot of these transition frequencies and temperatures agrees with the glass transition curve of PVC, based on a special thermodynamic theory (scaling concept). Some relaxation effects are discussed shortly applying well known theoretical aspects for different temperature and frequency regions.
    Notes: Die Messung der kernmagnetischen Relaxationszeiten T1, T1ϱ, T2e und T2 von PVC erfolgt durch die Anwendung verschiedener Impulsverfahren im Temperaturbereich von -150°C bis 200°C. Durch Variation verschiedener Meßparameter werden charakteristische Molekülumlagerungsfrequenzen ermittelt, deren Temperaturlagen in die WLF-Darstellung des Glasüberganges von PVC auf der Grundlage einer speziellen thermodynamischen Theorie (Scaling-Konzeption) gut eingeordnet werden können. Eine Reihe von methodenspezifischen Relaxationseffekten wird unter Verwendung bekannter theoretischer Aspekte aus der Literatur für unterschiedliche Temperatur- und Frequenzbereiche kurz diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1980.010310108
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Modeling the elementary steps of low-pressure diamond deposition (1993)
    Weinheim : Wiley-Blackwell
    Advanced Materials 5 (1993), S. 639-643 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19930050909
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Van der Waals model for filled rubbers with modified interfacial contacts (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 35 (1988), S. 345-362 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: It is shown how the global deformation mechanism in filler-loaded vulcanizates were modified by additional filler-to-matrix bonds. A quantitative description is given in terms of an extended van der Waals treatment including the formulation of a reduced mechanical equation of state. An interpretation of the Mullins softening is presented.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070350206
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Redox-chemical investigations of soluble oligo(p-phenylene)s (1991)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 192 (1991), S. 1679-1693 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The chemical and electrochemical reductions of two series of oligo(p-phenylene)s with different substitution patterns are investigated. The resulting anionic species are characterized on the one hand using NMR spectroscopy and quenching experiments obtaining dianions in the case of terphenyls and quaterphenyls. On the other hand, cyclic voltammetric experiments were carried out with the results that compounds with substitution only in the terminal rings behave as typical conjugated oligomers, and substituents in the middle rings disturb the conjugation and alter the mechanism of electron transfer. Further, the charge distribution, the stereodynamic behaviour and the redox potentials are examined as a function of chain length and substitution. The reduction of the title compounds shows that only the substitution of terminal phenyl rings leads to suitable model compounds for the doping of poly(p-phenylene).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1991.021920802
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Energy spectra of poly(arylenevinylene)s containing different aromatic units (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 81-93 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The energy gaps of poly(p-arylenevinylene)s with phenylene, naphthylene and anthrylene subunits are determined by extrapolating the UV/VIS spectroscopic data of the oligomers. The band structure of the three polymers was theoretically investigated. The topology-, geometry- and correlation-factors were determined upon which the energy spectra of this class of one-dimensional π-electron systems depend.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1992.021930108
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Die molekulargewichte nativer dextraneHerrn Prof. Dr. F. PATAT zu seinem 60. Geburtstag herzlich zugeeignet (1966)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 96 (1966), S. 206-220 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Extremely high values (ca. 6.108) have been received for the molecular weights of native dextrans by measurements in the ultracentrifuge and by light scattering. These values are the highest ever obtained for dissolved molecules.We have now determined the mol.wt. of native dextrans by five different methods (kinetic calculations, investigations of the branching reaction, fractionation on a thermo column, endgroup determination and velocity of depolymerisation by ultrasonic radiation). and arrived to much smaller values. For dextrans synthesized at low substrate concentrations the mol. wt. is about 250000, for those at higher substrat concentrations it decreases to around 70000.It is assumed, that the high values for the mol.wts. are in reality partical weights of associations with a very high stability.
    Notes: Für die Molekulargewichte nativer Dextrane waren außerordentlich hohe Werte (ca.6.108) angenommen worden, die aus Messungen in der Ultrazentrifuge und aus Lichtstreuungsdaten erhalten wurden. Diese Werte waren die höchsten, die jemals für Moleküle in Lösung bestimmt wurden.Mittels fünf verschiedener Methoden (kinetische Berechnungen, Untersuchungen über die Verzweigungsreaktion, Fraktionierung an einer Thermosäule, Endgruppenbestimmung und Verfolgung der Abbaugeschwindigkeit durch Ultraschall) wurden für die Zahlenmittelwerte des Molekulargewichts von nativen Dextranen wesentlich kleinere Werte gefunden. Danach haben Dextrane, die bei kleinen Substratkonzentrationen gebildet wurden, ein Molekulargewicht von etwa 250000; dieses verkleinert sich für solche, die bei hohen Substratkonzentrationen aufgebaut wurden, bis auf einen Wert von etwa 70000.Die hohen Molekulargewichtswerte werden auf Teilchengewichte von Assoziaten mit hoher Stabilität zurückgeführt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1966.020960117
    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...