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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 1 (1963), S. 527-540 
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: It has been shown that a nonreinforcing solid such as titanium dioxide can radically alter the glass transition temperature of the model polymer, poly(vinyl chloride-vinyl acetate) copolymer after being mechanically incorporated within it. The Tg values were either higher or lower than that of the original unfilled polymer, depending on the volume fraction of the solid. The magnitude of these changes is in some cases as great as 49°C. This phenomenon was explained on the basis of adsorption of the acetate radicals on the surface of the solid and the breaking of interchain hydrogen bonds. The changes in segmental mobility of the polymer as indicated by the variation in Tg were also verified by gaseous diffusion studies.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 1 (1963), S. 541-547 
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Crystalline solids, as exemplified by TiO2 incorporated within a film of a model polymer, poly(vinyl chloride-vinyl acetate) copolymer, have been shown to absorb relatively large amounts of water vapor on the surface. In some cases all of the crystal surface may participate in the sorption process, despite evidence that the polymer has been initially present on the surface of the former. This, coupled with anomalous density changes in the film, suggests the possibility of measuring crystal flocculation within the membranes as well as the displacement of adsorbed polymer segments by means of water vapor. The anomalous density determinations were correlated with water transport measurements, and an equation for calculation of the heat of wetting of a crystal with a solid polymer is presented.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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