The effect of thermal processing on PVC—III. Photo-oxidation of unstabilized PVC |
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Authors: | G Scott M Tahan J Vyvoda |
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Institution: | Department of Chemistry, University of Aston in Birmingham, Gosta Green, Birmingham B4 7ET, England |
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Abstract: | The rate of photo-oxidation of unstabilized PVC is markedly dependent on the severity of the processing operation. In mildly processed PVC, peroxy gel appears to be a very effective photo-initiator whereas in more severely processed polymer, solvent soluble polymer containing polyconjugation, hydroperoxides and carbonyl groups is primarily responsible for photo-initiation. The auto-retardation of photo-oxidation which occurs in all samples is believed to be due to the build-up of a highly absorbing surface layer of degraded polymer. |
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