负离子溶液聚合法高苯乙烯橡胶的合成及其性能

杨绮波　 汤海鲲　

摘　要：以环己烷为溶剂、苯乙烯和丁二烯为单体、n-BuLi为引发剂、二乙二醇二甲醚(2 G)为结构调节剂,通过活性负离子溶液聚合合成了高苯乙烯橡胶,研究了引发剂种类、聚合温度、2 G/n-BuLi(摩尔比)、苯乙烯/丁二烯(质量比)、相对分子质量及其分布对共聚橡胶力学性能的影响.结果表明,当苯乙烯/丁二烯为60/40、2 G/n-BuLi为1.0时,在(65±2) ℃下可聚合得到力学性能较好的高苯乙烯橡胶,其数均分子量为15×10~4～20×10~4、分子量分布为1.40左右.
关键词：苯乙烯;丁二烯;正丁基锂;结构调节剂;高苯乙烯橡胶;负离子溶液聚合
分类号：TQ333.1　文献标识码：B
文章编号：1000-1255(2010)02-0092-05

Synthesis and properties of high styrene rubber by anionic solution polymerization

Yang Qibo（Synthetic Rubber Research Institute, Lanzhou Petrochemical Research Center, PetroChina, Lanzhou 730060, China）　 Tang Haikun（Synthetic Rubber Research Institute, Lanzhou Petrochemical Research Center, PetroChina, Lanzhou 730060, China）　

Abstract：High styrene rubber was synthesized by living anionic solution polymerization with cyclohexane as solvent, styrene(St) and butadiene(Bd) as monomers, n-BuLi as initiator, diethylene glycol dimethyl ether (2 G) as structure regulator. The effects of initiator spicies, polymerization temperature, 2 G/n-BuLi(mole ratio), St/Bd(mass ratio), relative molecular mass and its distribution on mechanical properties of high styrene rubber were studied. The results showed that the high styrene rubber with number-average molecular mass of 15×10~4-20×10~4, and its distribution of 1.40 could be obtained at polymerization temperature (65±2) ℃, St/Bd (mass ratio) 60/40, 2 G/n-BuLi(mole ratio) 1.0, and the high styrene rubber had better mechanical properties under this conditions.
Keywords：styrene; butadiene; n-butyl lithium; structure regulator; high styrene rubber; anionic solution polymerization

收稿日期：2009年6月30日

修稿日期：2010年1月7日

出版日期：2010年3月15日