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Photolysis of polyesters: Poly(propylene-1,2-maleate) and poly(propylene-1,2-ortho-phthalate)

✍ Scribed by J. Lucki; J.F. Rabek; B. Rånby; C. Ekström

Publisher
Elsevier Science
Year
1981
Tongue
English
Weight
774 KB
Volume
17
Category
Article
ISSN
0014-3057

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✦ Synopsis

A spectroscopic study of the photo-oxidation of poly(propylene-l,2-maleate), poly(propylene-l,2-o-phthalate) and poly(propylene-l,2-maleate-o-phthalate) under 280-480 nm radiation was investigated in detail. Results obtained indicate that, during photolysis of these polyesters, the primary photoreactions involve excitation of conjugated structures: carbonyl groups (in ester groups)--double bonds or carbonyl groups-phenylene rings. The secondary reactions occur by complicated mechanisms resulting in oxidation, scission, radical termination and cross-linking of structures present in the photolysed polyesters. Light of wavelength 280-480nm causes deterioration in the polyesters in the early stages of irradiation. Singlet oxygen does not react with these polyesters even during long periods of exposure. Photo-oxidation mechanism occurs by free radical mechanism.

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