Photodegradation of poly(vinyl esters)—II. Volatile product formation and changes in the absorption spectra and molecular mass distributions
✍ Scribed by K.J. Buchanan; W.J. McGill
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- English
- Weight
- 459 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0014-3057
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✦ Synopsis
The vacuum photodegradation of poly(vinyl acetate) (PVACI has been re-examined and the investigation extended to include poly(vinyl propanoate) (PVPR) and poly(ethylene-co-vinyl acetate) (PEVAC). Acid, aldehyde and carbon dioxide were the major products in the vacuum photodegradations of all three polymers. Comparison of the proportions of acetic acid formed from PEVAC and PVAC indicated that the photo-elimination of acid in the latter occurred as random independent events. Support for this conclusion has been obtained from a quantitative study of the ultraviolet spectrum of photodcgraded PVAC Changes in the molecular mass distributions of the soluble fractions and in the gel content on photolysis indicate that a balance exists between crosslinking and chain scission in PVAC while chain scission dominates in PEVAC.