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Photo‐induced graft copolymerization of methyl methacrylate on oxidized poly(vinyl alcohol) fiber
Author(s) -
Ogiwara Yoshitaka,
Yasunaga Toshio,
Kubota Hitoshi
Publication year - 1976
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.1976.070200522
Subject(s) - methyl methacrylate , vinyl alcohol , copolymer , radical , photochemistry , irradiation , singlet state , sodium hypochlorite , polymer chemistry , chemistry , fiber , alcohol , materials science , polymer , organic chemistry , excited state , physics , nuclear physics
Photo‐induced graft copolymerization of methyl methacrylate on oxidized poly(vinyl alcohol) fiber was investigated. Oxidation of the fiber sample with sodium hypochlorite or periodic acid led the radical formation by photo‐irradiation to intensify markedly. ESR spectra of the irradiated oxidized sample proved that a considerable amount of triplet component radical was contained in it, whereas the unoxidized sample mostly indicated a singlet. The spectra found in the irradiated unoxidized sample was assigned to two radicals, I and II, and for the oxidized sample, to III and IV. The spectrum for I must be a singlet, and a triplet for II, III, and IV. Among the last three, II was less stable toward heat. As the oxidized sample has a high activity for photoinitiation, the radicals of III and IV are presumed to be the sites of graft copolymerization: