锡偶联溶聚丁苯橡胶塑炼过程的力化学研究

Study on mechanochemistry of tin coupled SSBR during mastication

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。

The effects of modification on the molecular weight( M w) 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 decreasing velocity of M w for both SSBR and ESBR depended on their initial M w,and there was a lower limit for their M w;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.