Liquid rubber as a reactive softener for 1-chlorobutadiene–butadiene rubber

✍ Scribed by Katsumi Sando; Shinzo Kohjiya; Yuko Ikeda; Shinzo Yamashita; Nariyoshi Kawabata

• Book ID: 101252173
• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 409 KB
• Volume: 62
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19961114)62:7<1093::aid-app15>3.0.co;2-7

✦ Synopsis

Blending of hydroxyl-terminated liquid butadiene rubber (HT-BR) with l-chlorobutadienebutadiene 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 about a good processability. The HT-BR fraction (Es) from the HT-BR/ CB-BR blend vulcanizates, which was prepared by the IPCI-cured system, was evaluated to be ca. 20% by the equilibrium swelling test in benzene. The Es 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 ratios of HT-BR to CB-BR.