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ESR study of pressure dependence of the peroxy radical decay in irradiated isotactic polypropylene
Author(s) -
Szöcs F.
Publication year - 1982
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.1982.070270601
Subject(s) - radical , tacticity , polymer , photochemistry , irradiation , polymer chemistry , materials science , oxygen , reaction rate constant , oxygen pressure , atmospheric pressure , polypropylene , chemistry , kinetics , polymerization , organic chemistry , composite material , physics , oceanography , quantum mechanics , nuclear physics , geology
By the use of gamma radiation the free radicals were generated in isotactic polypropylene. The polymer was exposed to the action of atmospheric oxygen and the peroxy radicals were formed. Then the decay of peroxy radicals was investigated at varying temperatures as a function of pressure. The rate constants of the free radical decay were determined, and the corresponding activation volumes were calculated. The kinetic characteristics imply that the peroxy radicals predominantly occured in amorphous region the polymer. The results suggest that useful information on molecular mechanism of radical reactions in the solid phase may be obtained from the determination of activation volumes.