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1‐Chloro‐1,3‐butadiene copolymers. I. Synthesis of copolymer with 1,3‐butadiene and physical properties of its vulcanizate
Author(s) -
Yamashita Shinzo,
Atomori SeiIchi,
Kohjiya Shinzo,
Miyagawa Toshio
Publication year - 1973
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.1973.070171011
Subject(s) - chloroprene , copolymer , natural rubber , materials science , neoprene , ultimate tensile strength , sulfur , glass transition , composite material , polymer chemistry , emulsion , chemistry , organic chemistry , polymer , metallurgy
Emulsion copolymerization of 1‐chloro‐1,3‐butadiene and 1,3‐butadiene was carried out using potassium persulfate at 50°C. The thus synthesized 1‐chloro‐1,3‐butadiene copolymer was possible to be cured with 2‐mercaptoimidazoline (MI) as well as with sulfur. The tensile strength of the MI vulcanizate of the copolymer compounded with 30 phr HAF black reached 100 kg/cm 2 and was higher than that of the sulfur vulcanizate. Moreover, these two vulcanizates showed higher tensile strengths than the sulfur vulcanizate of emulsion butadiene rubber. The addition of the copolymer to the blend of chloroprene rubber (Neoprene GRT) and butadiene rubber extremely improved the elongation and the tensile strength. Dynamic measurements of the vulcanizates showed that the glass transition temperature of the copolymer was situated at the region between that of butadiene rubber and that of chloroprene rubber.