双端官能化溶聚丁苯橡胶的合成与性能

Synthesis and properties of double-end-functionalized solution-polymerized styrene-butadiene rubber

以自主研发的官能化引发剂引发丁二烯在环己烷中的阴离子聚合反应,采用氯代硅氧烷化合物为封端剂制备了双端官能化聚丁二烯,考察了封端反应条件对聚合反应的影响。以自主研发的官能化引发剂和3-氯丙基三甲氧基硅烷为封端剂制备双端官能化溶聚丁苯橡胶(SSBR),并与正丁基锂引发制备的单端官能化SSBR的性能进行了对比。实验结果表明,随封端剂用量的增大,封端效率增大,偶联效率减小;随聚合物分子量的增大,封端效率和偶联效率均减小;封端温度应控制在40~60℃范围内。与单端官能化SSBR相比,双端官能化SSBR的拉伸强度、断裂伸长率、撕裂强度等物理机械性能和滚阻性能有所提升。

The double-end functionalized polybutadiene was prepared by anionic polymerization of butadiene in cyclohexane initiated using a self-developed functionalization initiator and ended using chlorosiloxane compounds as end-capping agent.The effects of end-capping conditions on the polymerization reaction were studied.A double-end functionalized solution-polymerized styrene butadiene rubber(SSBR)was prepared by using the self-developed functionalization initiator and 3-chloropropyl trimethoxy-silane as end-capping agent.The performance of double-end functionalized SSBR was compared with that of single-end functionalized SSBR initiated by n-butyllithium.The experimental results show that the capping efficiency increase and coupling efficiency decrease with the increase of amount of endcapping agent,capping efficiency and coupling efficiency decrease with the increase of molecular weight of the polymer.The capping temperature should be controlled in the range of 40-60℃.Some physical and mechanical properties such as tensile strength,elongation at break and tear strength and rolling resistance of double-end functionalized SSBR are improved compared with single-ended functionalized SSBR.