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Liquid rubber as a reactive softener for 1‐chlorobutadiene–butadiene rubber
Author(s) -
Sando Katsumi,
Kohjiya Shinzo,
Ikeda Yuko,
Yamashita Shinzo,
Kawabata Nariyoshi
Publication year - 1996
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/(sici)1097-4628(19961114)62:7<1093::aid-app15>3.0.co;2-7
Subject(s) - natural rubber , curing (chemistry) , sulfur , materials science , ultimate tensile strength , swelling , polymer chemistry , vulcanization , benzene , composite material , chemistry , organic chemistry , metallurgy
Blending of hydroxyl‐terminated liquid butadiene rubber (HT‐BR) with 1‐chlorobutadiene–butadiene rubber (CB–BR) was carried out in the presence of isopropylidenedicyclohexyl diisocianate (IPCI) or sulfur as a curing agent, It was found that the HT‐BR/CB–BR blend displayed a good plasticity, i.e., its Mooney viscosity became lower than that of CB–BR, which brought abcut a good processability. The HT‐BR fraction ( E s from the HT‐BR/CB–BR blend vulcanizates, which was prepared by the IPCI‐cured system, was evaluated to be ca. 20% by the equilibium swelling test in benzene. The E s of the sulfur‐cured blend was ca. 70% This result shows that HT‐BR acted as a reactive softener when it was compounded with CB–BR by curing with the diisocyanate. The tensile strength of the IPCI vulcanizate was exceedingly higher than that of sulfur‐cured vulcanizate at all blend raios of HT‐BR to CB–BR. © 1996 John Wiley & Sons, Inc.