锡偶联溶聚丁苯橡胶塑炼过程的力化学研究

贾红兵　 吉庆敏　 金志刚　 张士齐　 吴金声　 刘青　

摘　要：研究了国产锡偶联溶聚丁苯橡胶(SSBR)在加工过程中相对分子质量、相对分子质量分布及微观结构的变化，并与乳聚丁苯橡胶(ESBR)进行了比较。结果表明，在塑炼过程中，SSBR和ESBR相对分子质量的下降速度与初始相对分子质量有关，相对分子质量存在下限值；SSBR的相对分子质量分布曲线由双峰转化成单峰，并变窄；SSBR和ESBR的主链断裂，产生过氧自由基，SSBR的塑炼过程力化学稳定性优于ESBR。
关键词：锡偶联SSBR：ESBR：塑炼；相对分子质量；相对分子质量分布；力化学稳定性
分类号：TQ333.1　文献标识码：A
文章编号：1000-890X(2000)03-0131-04

Study on mechanochemistry of tin-coupled SSBR during mastication

JIA Hong-bing ,JI Qing-min ,JIN Zhi-gang ,ZHANG Shi-qi
((Nanjing University of Science and Technology, Nanjing 210094))
WU Jin-sheng ,LIU Qing
((Beijing Yanshan Petrochemical Company, Beijing 102549))

Abstract：The effects of modification on the molecular weight(Mw) and the molecular weight distribution(MWD), as well as the microstructure of tin-coupled SSBR and ESBR were investigated. The results showed that during the mastication,the decteasing velcith of Mw for both SSBR and ESBR depended on their initial Mw,and there was a lower limit for their Mw;the bipeaks shifted to single peak in the SSBR MWD curve and the MWD became more narrow;the main chains of both SSBR and ESBR broke down to give off the peroxy radicals;and the mechanochemical stability of SSBR was superior to that of ESBR.
Keywords：tin-coupled SSBR;ESBR;mastication;molecular weight;molecular weight distrbution;mechanochemical stability