Premium
Enhanced degradation of cellulose acetate films in the copresence of triphenylsulfonium salt and benzophenone
Author(s) -
Hosono Kiyoshi,
Kanazawa Akihiko,
Mori Hideharu,
Endo Takeshi
Publication year - 2008
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.28270
Subject(s) - benzophenone , cellulose acetate , degradation (telecommunications) , acetic acid , chemistry , polymer chemistry , acetylation , cellulose , brønsted–lowry acid–base theory , salt (chemistry) , nuclear chemistry , catalysis , organic chemistry , biochemistry , telecommunications , computer science , gene
To investigate whether benzophenone (BP) enhances triphenylsulfonium salt (TPS) degradation of cellulose acetate (CA) during photoirradiation, CA (degree of substitution = 2.45) films containing TPS and BP were prepared, and their degradative behavior was examined under simulated solar exposure. The irradiation‐evoked generation of acetic acid from the films was greater in the copresence of TPS and BP than in the sole presence of TPS. This result indicates that the TPS was activated by BP to produce Brønsted acid, which induced the deacetylation of CA effectively. As a possible mechanism for this activation of TPS, we postulated that the TPS oxidized free‐radical species induced by the photoreaction of BP, which was followed by the generation of Brønsted acid. The activation of TPS by BP did not appear to significantly accelerate the main‐chain cleavage of CA because size exclusion chromatography data did not reveal any decrease in the molecular weight of CA. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci 2008