Aging and Degradation of Polyolefins. 4. Photodecompositions of Model Peroxides
Rept. no. 12 (Final), 1 Jun 1969-31 Aug 1972
STANFORD RESEARCH INST MENLO PARK CA
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Previous reports in this series have discussed in detail the mechanism of free radical oxidation of atactic polypropylene APP in the dark. The present report evaluates the importance of some photochemical oxidation and cleavage reactions involved in the degradation of polypropylene. There appear to be no unusual effects of phase change or near uv radiation on the reactions of alkoxy radical models for APP. Photochemical and thermal cleavages of t-amyloxy radicals, a model for polypropylene oxy radicals, give nearly the same rate ratio. The results raise doubts about reports of cleavage of methyl radicals from tertiary alkoxy radicals in polypropylene.
- Radiation and Nuclear Chemistry