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  • 1
    Electronic Resource
    Electronic Resource
    Evolution of time constants during sol-gel transition (1989)
    Springer
    Rheologica acta 28 (1989), S. 535-539 
    Details
    ISSN: 1435-1528
    Keywords: Sol-gel transition ; crosslinkingpolymers ; relaxation function ; creep function ; time constants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract In developing a rheological constitutive equation for crosslinking polymers the determination and explanation of time constants are of great importance. For stoichiometrically balanced and imbalanced reactions of polydimethylsiloxane and polyurethane model polymers with appropriate “cross-linkers”, it is shown that the experimental data for the storage and loss moduli are well fitted within a large frequency range by a linear rheological constitutive equation with a truncated power law relaxation function. Special attention is given to the problem of estimating the different time constants. A method is proposed for the determination of the terminal relaxation time (in the case below the gel point) and a characteristic retardation time (in the case above the gel point) from the intersection points of the high and low frequency asymptotes of the storage modulus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01332925
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamics of non-uniform expanded polymer chains in dilute solutions (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 291-296 
    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 der BIXON-ZWANZIG-Theorie wird die Dynamißk von Polymerlösungen unter Berücksichtigung voi hydrodynamischen and excluded-volume-Wechselwirkungen konsistent behandelt. Die Ergebnisse bestätigen die wesentlichsten Eigenschaften des “blob” -Bildes, d. h. den Einfluß der nicht-uniformen Ausdehnung der Kette auf die Relaxationszeiten und die Intrinsic-Viskosität, unterscheiden sich im Detail jedoch von den Ergebnissen von DAUD und JANNINK sowie WEILL und DES CLOIZEAUX. Entgegen den Voraussagen wird ein zweites Plateau in [η(ω)] nicht beobachtet.
    Notes: The dynamics of polymer solutions are consistently treated by the BIXON-ZWANZIG theory including both hydrodynamic and excluded volume interactions. The results confirm generally the essential features of the “blob” picture in polymer dynamics, i.e. the influence of non-uniform chain expansion on the relaxation time spectra and the intrinsic viscosity, but differs in detail from results by DAOUD and JANNINK and WEILL and DES CLOIZEAUX. Especially no second plateau in [η(ω)] is observed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330501
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrasonic attenuation of polymer solutions. I. Dilute solutions (1985)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 36 (1985), S. 652-654 
    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: Die Ultraschalldämpfung in einer verdünnten Polymerlösung wird im Rahmen der Kirkwoodschen Diffusionsgleichung untersucht. Eine Frequenzabhängigkeit vom Rouse-Zimm-Typ und eine Relation zwischen Scher- und Volumenviskosität werden erhalten.
    Notes: The ultrasonic attenuation in dilute polymer solutions is treated in the framework of the Kirkwood diffusion equation. A Rouse-Zimm type relaxation behaviour of the ultrasonic attenuation results from the calculations, and a relationship between the intrinsic shear and bulk viscosity is derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1985.010361203
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  • 4
    Electronic Resource
    Electronic Resource
    Ultrasonic attenuation of polymer solutions. II. Concentrated solutionsPart 1: [1] (1986)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 226-229 
    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 des Edwards-Grant-Modells wird die Ultraschalldämpfung in konzentrierten Polymerlösungen untersucht. Verschlaufungen der Ketten ändern die Frequenzabhängigkeit der Ultraschalldämpfung von ∼ω-1/2zu∼ω-3/4.
    Notes: In the framework of the Edwards-Grant model, the ultrasonic attenuation of concentrated polymer solutions is calculated. Entanglements between the chains change the frequency behaviour of the ultrasonic attenuation from ∼ω-1/2zu∼ω-3/4
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1986.010370411
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  • 5
    Electronic Resource
    Electronic Resource
    Dynamisches Verhalten verdünnter Polymerlösungen (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 92-97 
    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 optimized ROUSE-ZIMM-theory by BIXON and ZWANZIG is used to derive consistently viscoelastic relaxation times of chain models including the hydrodynamic interaction and excluded volume. The intrinsic viscosity is calculated on the basis of these relaxation time spectra.
    Notes: Auf der Basis des von BIXON und ZWANZIG begründeten optimierten ROUSE-ZIMM-Modells werden viskoelastische Relaxationszeiten für Modellketten unter Berücksichtigung des excluded-volume-Effecktes und der hydrodynamischen Wechselwirkung in konsistenter Weise berechnet. Die Eigenviskosität wird auf der Grundlage der Relaxationszeit-spektren berechnet.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010320205
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  • 6
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    Test of a variational method applied to disordered systems (1979)
    American Physical Society
    Details
    Publication Date: 1979-12-15
    Print ISSN: 0163-1829
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society
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  • 7
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    Effects of density and compositional fluctuations on the electron density of states of one-dimensional systems (1982)
    American Physical Society
    Details
    Publication Date: 1982-09-15
    Print ISSN: 0163-1829
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society
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