Premium
Oxidation behavior of isoprene/styrene copolymer and butadiene/styrene copolymer
Author(s) -
Sakota Kazuyuki,
Okuno Kenji,
Okaya Takuji,
Tsuchiya Shizuo
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.1976.070201015
Subject(s) - copolymer , styrene , isoprene , materials science , polymer chemistry , irradiation , ultraviolet , styrene butadiene , emulsion , thermal oxidation , photochemistry , composite material , chemistry , polymer , organic chemistry , physics , optoelectronics , nuclear physics , layer (electronics)
The oxidation behavior of emulsion isoprene/styrene copolymer (SIR) and emulsion butadiene/styrene copolymer (SBR) by heat aging of ultraviolet irradiation in air has been investigated from the change of gel fraction, intrinsic viscosity, molecular weight distribution, and mechanical properties. Upon oxidation by heat aging, SIR predominantly undergoes chain scission and shows only a slight change of mechanical properties, whereas SBR predominantly undergoes crosslinking and sharply becomes brittle. Upon oxidation by ultraviolet irradiation, SIR undergoes both chain scission and crosslinking and shows almost no substantial change in mechanical properties, whereas SBR predominantly undergoes crosslinking and sharply becomes brittle. The probability ratio of chain scission to crosslinking with oxidation by heat aging or ultraviolet irradiation was determined by the method of Charlesby et al. The results can reasonably explain the oxidation behavior of the copolymers described above.