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  • 1
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 28 (1990), S. 1431-1441 
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Positron annihilation spectroscopy has been used to study free volume in an arnine-cured epoxy as a function of external pressure at temperatures above and below the glass transition temperature. The observed ortho-positronium lifetime τ3 and formation probability I3 decreased with increasing pressure. The decrease in τ3 is interpreted in terms of a corresponding decrease in average free-volume hole size over the range from 0.135 to 0.045 nm3. The fractional free-volume and the free-volume compressibility in the epoxy are calculated as functions of pressure at 100°C.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 121 (1984), S. 49-57 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurden die Verträglichkeit und die mechanischen Eigenschaften von Mischungen von Polyurethanelastomeren und Polyvinylchlorid untersucht. Die Ergebnisse zeigten eine teilweise Verträglichkeit zwischen Polyurethan und Polyvinylchlorid. Wenn der Anteil von PVC in den Mischungen 75% überstieg, nahm die Verträglichkeit ab. Auf der anderen Seite verbesserte die Erhöhung des Molekulargewichtes des Glykols im Polyurethan die Verträglichkeit. Die Dehnung nahm ab und der Young Modul stieg an in dem Verhältnis, wenn der Gewichtsanteil von PVC in den Mischungen erhöht wurde. Die Zugfestigkeit erreichte ein Minimum, wenn das Verhältnis PUR:PVC = 50:50 betrug.
    Notes: The compatibility and the mechanical properties of the blends of polyurethane (PU) elastomer and poly(vinyl chloride) (PVC) were studied. The results showed partial compatibility between PU and PVC. When the portion of PVC in blends exceeded 75%, the compatibility decreased. On the other hand, increasing the molecular weight of the glycol in PU improved the compatibility. The elongation decreased and the Young's modulus increased as the proportion of the weight of PVC in blends was increased. The tensile strength reached a minimum when PU/PVC was 50/50.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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