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  • 1970-1974  (2)
  • 1965-1969  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Rheologica acta 13 (1974), S. 99-102 
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung Es werden die dynamisch-mechanischen Eigenschaften von ausgehärteten Epoxydharzen untersucht, die mit kleinen Glimmerplättchen gefüllt sind. Bei den gefüllten Proben wird ein Nebenmaximum der Absorption bei etwa 80 °C beobachtet, wohingegen die ungefüllte Probe nur ein Hauptmaximum bei ungefähr 140 °C aufweist. Der Modul der gefüllten Proben zeigt in dem bei hohen Temperaturen liegenden kautschukelastischen Bereich außergewöhnlich hohe Werte. Zur Erklärung dieses Verhaltens wird angenommen, daß die auf die Probe im Ganzen wirkende Zugspannung in den dünnen Harzschichten, die jeweils zwischen zwei benachbarten Glimmerplättchen vorhanden sind, in eine Schubspannung verwandelt wird.
    Notes: Summary Dynamic mechanical properties of cured epoxy resins filled with small mica flake were investigated. A secondary absorption peak was observed for filled specimens around 80 °C, while unfilled specimen showed only a primary absorption peak around 140 °C. Modulus of filled specimens at high temperature rubbery region showed extraordinary high value. As an explanation to this behavior, it was proposed that the tensile stress applied to specimen was converted to shear stress in a thin resinous layer sandwiched by two mica flakes.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 8 (1970), S. 2095-2103 
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Electron-microscopic texture and physical properties of a styrene-butadiene-styrene (SBS) block copolymer obtained by casting from toluene, carbon tetrachloride, ethyl acetate, and methyl ethyl ketone are discussed. Two peaks are observed in the mechanical loss (tan delta;) curve at -70 and 100°C which are attributed to segmental motion of polybutadiene and polystyrene, respectively. The polybutadiene peak heights are in the order of solubility in the solvent used; the polystyrene peak heights are in converse order. In addition to these peaks, a third peak is observed at 10°C for specimens cast from ethyl acetate or methyl ethyl ketone. A transition corresponding to this peak is also noticed in thermal analysis. It is proposed that aggregation of styrene blocks is relatively incomplete in specimens cast from solution in poor solvents.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 2637-2651 
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Viscoelastic properties of unsaturated polyesters were investigated in the glass-rubber transition region in relation to the temperature dependence of specific volume. Polyesters which are homologous with respect to crosslinking density were prepared by using mixtures of succinic and fumaric acid as the dibasic acid component. The temperature dependence of the specific volume was determined by refractive index measurement, the specific refractivity being assumed to be independent of temperature. The temperature dispersion of dynamic viscoelasticity was measured at a constant frequency. Results are summarized as follows. Specific volume and glass temperature are linearly related to the logarithm of crosslinking density. The thermal expansion coefficient and steepness of viscoelastic dispersion decrease with increasing crosslinking density. Fractional free volume and expansion coefficient of free volume, both of which were calculated by WLF equation, are in good agreement with the temperature dependence of specific volume. The results indicate that the effect of crosslinking is largely attributable to the change in amount and distribution of free volume in polymer networks.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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