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The photodegradation of polypropylene. IV. UV stabilizer decomposition
Author(s) -
Carlsson D. J.,
Grattan D. W.,
Suprunchuk T.,
Wiles D. M.
Publication year - 1978
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1978.070220814
Subject(s) - stabilizer (aeronautics) , photodegradation , polypropylene , radical , decomposition , photochemistry , polymer , oxygen , degradation (telecommunications) , irradiation , polymer chemistry , chemistry , photoprotection , materials science , chemical engineering , organic chemistry , photocatalysis , catalysis , mechanical engineering , telecommunications , biochemistry , physics , photosynthesis , computer science , nuclear physics , engineering
The destruction of various UV stabilizers in polypropylene films during irradiation has been examined both in the presence and absence of air and oxidation products. Although some stabilizers were destroyed in the absence of oxygen, all were more sensitive when irradiated in the presence of air. Several stabilizers were highly effective but were destroyed so rapidly that photoprotection of the polymer must have resulted from stabilizer products. Work with preoxidized polymer and with model hydroperoxides and peroxides indicated that most stabilizers were destroyed by the attack of oxygen‐centered radicals, with peroxy radical attack appearing to dominate.