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Photodegradation of poly(vinyl esters)—I. Formation and quantitative measurement of volatile products

✍ Scribed by K.J. Buchanan; W.J. McGill

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
295 KB
Volume
16
Category
Article
ISSN
0014-3057

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✦ Synopsis

The high vacuum distillation technique for the analysis ~f photolysis products has highlighted both the extreme difficulty of removing residual solvent and the slow diffusion of photodegradation products from thin cast poly(vinyl ester) films, even at temperatures 130:C above Tg. Very long product collection periods at temperatures just below the onset of thermal degradation were used in order to obtain reliable quantitative data. The distributions of liquid-nitrogen condensable products indicated that a closer relationship exists between the photodegradation of polylvinyl esters) and the photolysis of low molecular mass esters than previous results had suggested.

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Photodegradation of poly(vinyl esters)—I
Photodegradation of poly(vinyl esters)—II. Volatile product formation and changes in the absorption spectra and molecular mass distributions
✍ K.J. Buchanan; W.J. McGill 📂 Article 📅 1980 🏛 Elsevier Science 🌐 English ⚖ 459 KB

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 p

Photodegradation of poly(vinyl esters)—I
Photodegradation of poly(vinyl esters)—III. Photolysis mechanism for both polymeric and low molecular mass esters
✍ K.J. Buchanan; W.J. McGill 📂 Article 📅 1980 🏛 Elsevier Science 🌐 English ⚖ 376 KB

Acid, aldehyde and carbon dioxide were the major products of the vacuum photodegradations of poly(vinyl acetate) (PVAC), poly(vinyl propanoate) (PVPR) and poly(ethylene-co-vinyl acetate) (PEVAC). Aldehydes have not previously been reported as formed from the acid portions of esters undergoing photol