Abstract
The elementary processes of photodegradation of polyvinylchloride have been investigated by both electron spin resonance and optical absorption measurements. The final products formed via these elementary reactions have been detected by infra-red absorption measurements. On irradiating polyvinylchloride films at −196°C, alkyl type radicals were produced. This type of radical is shown to be a precursor of the polyenyl type radical which is produced at higher temperatures. The allyl, dienyl and polyenyl type radicals were observed in the course of photodegradation. The peroxy radical was found to be produced by oxidation of the polyenyl type radical. A possible mechanism for the photodegradation of polyvinylchloride films is proposed on the basis of these observations. The mechanism of stabilisation against photodegradation has also been examined for polyvinylchoride films containing 4-methoxy-2-hydroxybenzophenone as an ultra-violet absorber.
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