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  • 1980-1984  (8)
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  • 1
    facet.materialart.
    Unknown
    Ultrasonic attenuation and mobility in polymer solutions and dispersions. Poly(vinyl alcohol) and poly(vinyl acetate) (1982)
    Springer
    Details
    Publication Date: 1982-10-01
    Print ISSN: 0170-0839
    Electronic ISSN: 1436-2449
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Ultrasonic attenuation and mobility in polymer solutions and dispersions. Poly(vinyl alcohol) and poly(vinyl acetate) (1982)
    Springer
    Polymer bulletin 8 (1982), S. 269-274 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00700288
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  • 3
    Electronic Resource
    Electronic Resource
    Ergebnisse von Ultraschallabsorptionsmesungen an Polyvinylacetat, Polyacrylat und ausgewählten Terpolymeren in Lösung und Dispersion (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 348-352 
    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: Ultrasonic absorption measurements were carried out with polymers having analogous basic chemical structure in different states of dispersion. Molecular dispers systems of poly(vinyl acetate) and polyacrylate show relaxation in the range of 10 to 80 MHz which can be explained by local changes of conformation. In the colloid disperse state a cooperative mechanism of motion was found at suitable values of the measuring temperature.
    Notes: An Polymeren mit gleicher chemischer Grundstruktur in unterschiedlichen dispersen Zuständen wurden Ultraschall absorptionsmessungen durchgeführt. Molekulardisperse Polyvinylacetat- und Polyacrylatsysteme zeigen im Bereich von 10 bis 80 MHz Relaxationserscheinungen, die durch lokale Konformationsänderungen erklärt werden können. Im kolloiddispersen Zustand findet man bei geeigneter Wahl der Meßtemperatur einen kooperativen Bewegungsmechanismus vor.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1980.010310602
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Ultraschallabsorption in kolloiddispersen Polymersystemen (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 215-220 
    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 ultrasonic attenuation of PVAC-dispersions outside the relaxation regions has been studied in the frequency range between 150 kHz and 1 GHz. With all studied samples the excess attenuation is proportional to the frequency over a range of four decades. Comparing the experimental results with theoretical model shows that sound attenuation in polymer dispersions can be explained by a model proposed for other heterogeneous systems.
    Notes: Experimentelle Ergebnisse von Ultraschalldämpfungsmessungen an Polyvinylacetatdispersionen werden vorgestellt. Die Meßfrequenz variiert zwischen 150 kHz und 1 GHz. Das Dämpfungsverhalten dieser Dispersionen wurde außerhalb auftretender Relaxationen beobachtet. Die Überschußdämpfung zeigte bei allen Typen Proportionalität zur Frequenz im Bereich von vier Dekaden. Dieses experimentelle Verhalten wurde mit theoretischen Vorstellungen verglichen. Es erwies sich, daß die Schalldämpfung in Polymerdispersionen in einem sehr großen Frequenzbereich gut beschreibbar ist mit Modellen, die für andere heterogene Systeme Anwendung finden.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010320407
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  • 5
    Electronic Resource
    Electronic Resource
    Ultraschallgeschwindigkeitsuntersuchungen an Polymerdispersionen unterschiedlicher chemischer Zusammensetzug mit Hilfe einer Impuls-Laufzeit-Apparatur (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 573-577 
    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 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
    URL: http://dx.doi.org/10.1002/actp.1981.010320911
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  • 6
    Electronic Resource
    Electronic Resource
    Ultraschalluntersuchungen an wäßrigen Dispersionen von Ethylacrylat/Vinylacetat/Acrylsäure-Terpolymeren, interpretiert mit Hilfe der 13c-NMR-Sequenzanalyse (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 351-353 
    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: Ultrasonic measurements were carried out with ethyl acrylate (EA)/vinyl acetate (VAC)/acrylic acid (VS) terpolymers in aqueous dispersion. The experimental results were compared with data obtained by 13C-NMR investigations and explained by considering the mean sequence length. Three phases were detected consisting of polyvinylacetate, polyethylacrylate and P(VAC-EA). The fraction of these phases within the dispersed particle was calculated from the mean sequence length. A quantitative correlation was established by using the corresponding values of ultrasonic absorption and particle compressibility.
    Notes: An Wäßrigen Dispersionen von Ethylacrylat (EA)/Vinylacetat (VAC)/Acrylsäure (AS)-Terpolymeren wurden Ultraschalluntersuchungen durchgefährt. Die experimentellen Ergebnisse wurden mit 13C-NMR-Daten verglichen und aur der Basis der mittleren Sequenzlängen interpretiert. Es konnte die Existenz von deri Phasen, bestenhend aus Polyvinylacetat, Polyethylacrylat sowie P(VAC-EA), nachgewiesen werden. Der Anteil der Phasen am Dispersionsteilchen wurde mit Hilfe der mittleren Sequenzlängen berechnet. Es wurde eine quantitative Korrelation mit entsprechenden Werten der Ultraschallabsorption und der Teilchenkompressibilität gefunden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330602
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  • 7
    Electronic Resource
    Electronic Resource
    13C-NMR-Undersuchungen zur Sequenzverteilung in Vinylacetat/Ethylacrylat/Acrylsäure-Terpolymeren (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 347-350 
    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: 13C-NMR measurements were carried out in order to determine the microstructure of sequences in terpolymers of vinyl acetate, ethyl acrylate and acrylic acid with varying amounts of ethyl acrylate and negligible amount of acrylic acid. The resonances of the methin carbon were assigned to traids, that of methylene carbon of the main chain to diads of the monomer units. The following microstructure parameters were determined from the particle frequency and compared with data calculated from the statistical distribution: mean block length, amount of blocks, block parameter and reactivity product rvacrea.
    Notes: 13C-NMR-Messungen (22,635 MHz) Wurden durchgeführt, um die Sequenzmikrostruktur in Vinylacetat/Ethylacrylat/Acrylsäure-Terpolymeren bei variiertem Ethylacrylatanteil und vernachlässigbarem Acrylsäureanteil zu bestimmen. Die Resonanzden des Methinkohlenstoffs wurden auf Traiden, Die des Methylenkohlenstoofs der Hauptkette auf Diaden von Monomereinheiten zurüchgeführt. Aus den Teilstrukturhäufigkeiten wurden folgende Mikrostrukturparameter bestimmt: mittlere Blocklängen, Blockzahl, Blockparameter und Reaktivitätenproduckt rvacrEA und mit den für statisische Verteilung bereechneten Werten verglichen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330601
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  • 8
    Electronic Resource
    Electronic Resource
    The investigation of polymerization process by means of ultrasound (1983)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 303-304 
    Details
    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
    URL: http://dx.doi.org/10.1002/actp.1983.010340513
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