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  • 1
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary To obtain informations about molecular processes, poly(vinyl alcohol) solutions and poly(vinyl acetate) solutions and dispersions have been studied by ultrasonic methods in the frequency range from 200 kHz to 150 MHz. The measured excess attenuations are qualitatively discussed in terms of cooperative and local mode motions of the macromolecules. In poly(vinyl alcohol) solutions with different residual vinyl acetate content a mixing of normal and local mode motions has been observed. In poly(vinyl acetate)/toluene solution two discrete relaxation processes have been detected which are probably related to a local mode and a coupling of local and normal mode motions, respectively. The frequency-temperature dependence of the absorption maximum of the poly(vinyl acetate) dispersion follows the WLF relation.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 71 (1999), S. 1051-1052 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 3
    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 results obtained by measuring the ultrasonic velocity at 0.8 MHz in dispersions of polymers having different chemical composition are described. Based on the values of compressibility of the polymers resulting from ultrasonic velocity data the plasticity of dispersed particles is estimated. The relationship between chemical structure and compressibility is discussed. A correlation between compressibility and glass transition temperature, as determined by ultrasonic absorption measurements at 0.8 MHz, is established. The investigations are of importance in industrial testing of dispersions of plastomers and elastomers.
    Notes: Die Resultate von Ultraschallgeschwindigkeitsmessungen bei 0,8 MHz an Polymerdispersionen unterschiedlicher chemischer Zusammensetzung werden vorgestellt. Mit Hilfe der aus der Schallgeschwindigkeit berechneten Polymerkompressibilität werden quantitative Aussagen über die Plastizität der Dispersionsteilchen gewonnen. Der Zusammenhang zwischen chemischer Struktur und Kompressibilität wird diskutiert. Es wird eine Korrelation zwischen den Polymerkompressibilitäten und der Lage des Glasübergangs, welche mittels Schallabsorptionsmessungen bei 0,8 MHz ermittelt wurde, nachgewiesen. Anwendungstechnische Relevanz haben diese Untersuchungen für die Prüfung von Plast- und Elastdispersionen in der industriellen Praxis.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 316-322 
    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 behaviour of poly(vinyl alcohol) (PVA) in water was investigated by ultrasonic absorption and velocity measurements. The discussion of the results is based on a theory of ultrasonic absorption in polymer solutions by Gotlib et al. The received results are discussed in connection with the current concepts of the state of solution of PVA.
    Notes: Mit Hilfe von Ultraschall-Absorptions- und -Geschwindigkeitsmessungen wurde das Lösungsverhalten von Polyvinylalkohol (PVA) in Wasser untersucht. Der Diskussion der Ergebnisse wird eine Theorie der Schallabsorption in Polymerlösungen von Gotlib u. a. zugrunde gelegt. Die gewonnenen Aussagen werden im Zusammenhang mit bekannten Modellvorstellungen zum Lösungszustand von PVA diskutiert.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 303-304 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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