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The photo-oxidation of PVC and impact modified PVC. Chemical changes

✍ Scribed by Gerald Scott; Menashe Tahan

Publisher: Elsevier Science
Year: 1977
Tongue: English
Weight: 429 KB
Volume: 13
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(77)90171-9

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✦ Synopsis

The photo-oxidative degradation of PVC modified by the incorporation of ABS, MBS and MABS polyblends was studied by i.r. spectrophotometry, and colour measurement. It was found that impact modified PVC photo-oxidised in two distinct stages: an initial rapid but short stage followed by a longer period of slower degradation. The fast stage was caused by the rapid photo-oxidation of the polybutadiene phase, which accelerates the degradation of the PVC. The polybutadiene photooxidation also accelerates discoloration and the formation of colour is linearly related to the formation of conjugated carbonyl compounds in the polymer. A synergistic PVC stabiliser system inhibited the formation of the conjugated chromophore. Prior thermal treatment of both PVC and impact modified PVC's accelerated the rate of photo-oxidative degradation.

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