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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 214 (1994), S. 1-9 
    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: Der photo-oxidative Abbau von Blends aus Polyethylenterephthalat (PET) und Poly(2,6-dimethyl-1-1,4-phenylenoxid) (PPO) wurde untersucht, wobei die gegenseitige Beeinflussung beider Komponenten berüucksichtigt wurde. Im Temperaturbereich 30 - 100°C wurden die Auswirkungen der Segmentbeweglichkeit der Polymerketten ermittelt. Für kurze UV-Bestrahlung (365 nm) ist der Abbau diffionskontrolliert und kann mit der Theorie von Waite erklärt werden. Die Wechselwirkungen der Polymersegmente in den Blends beeinflussen auch die Diffusionskoeffizienten und die Aktivierungsenergie. Für PET in Blends verursacht eine höhere Aktivierungsenergie eine Abnahme des Kettenbruchs.
    Notes: Photo-oxidative degradation of blends of poly(ethylene terephthalate) (PET) and poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) was studied considering the mutual influence of both components. The photo-oxidation of these systems was investigated in the temperature range 30-100°C to study the effects of segmental motion of polymer chains. For short time of UV-illumination at 365 nm the process is diffusion controlled and can be explained with the help of Waite's theory. The segmental interactions of polymer segments in the blends also affect the diffusion coefficients and the activation energy values. Higher values of the activation energy of PET in the blends cause a decrease of chain breaking.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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