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The mechanism of radiation damage to elastomers. II. Crosslinking and antirad action
Author(s) -
Bauman Richard G.
Publication year - 1959
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.1959.070020612
Subject(s) - chain scission , elastomer , oxygen , swelling , radical , polymer , natural rubber , bond cleavage , polymer chemistry , irradiation , carbon black , reaction mechanism , chemistry , materials science , photochemistry , composite material , organic chemistry , catalysis , physics , nuclear physics
The effect of antirads (compounds added to reduce changes of polymer properties during irradiation) on the crosslink yields in black‐loaded natural rubber stocks during gamma irradiation has been measured. The crosslink yields were determined by swelling techniques. Antirads decrease the crosslink yields if oxygen is absent. Oxygen alone effectively decreases crosslink yields. In the presence of oxygen some antirads further decrease crosslink yields, while others increase crosslink yields by their presence. These results may be explained in terms of competitive reactions between R. radicals, the antirad, and oxygen. Evaluation of the ratios of crosslink yields and scission yields indicate that most of the scission is temporary in nature, the chain breaks being reformed rapidly.