苯乙烯基封端聚丁二烯大分子单体的制备  

Synthesis of( p-vinylbenzyl) polybutadiene macromonomer

作　　者：王翔[1] 黄琼戎 邓寻浔 张春庆[1] 

机构地区：[1]大连理工大学高分子材料系,辽宁大连116024

出　　处：《合成橡胶工业》2015年第1期25-29,共5页China Synthetic Rubber Industry

摘　　要：采用负离子聚合法制备聚丁二烯活性种,以对氯甲基苯乙烯(VBC)作为封端剂制备了苯乙烯基封端的聚丁二烯大分子单体。通过核磁共振和凝胶渗透色谱等手段对产物进行了表征,并考察了封端反应温度和VBC用量对封端效率的影响。结果表明,VBC可用于制备末端含有苯乙烯基团的聚丁二烯大分子单体。筛选的最佳实验条件为:反应温度0℃,以四氢呋喃作极性调节剂,VBC与负离子活性种的摩尔比大于8/1,此时聚丁二烯大分子单体的封端效率可达90%以上。此外还探讨了导致封端效率降低的副反应机理。A series of（ p-vinylbenzyl） polybutadiene macromonomers were synthesized by living anionic polymerization of butadiene followed by a direct capping reaction of polybutadienyllithium with p-vinylbenzyl chloride（ VBC）. The macromonomers obtained were characterized by proton nuclear magnetic resonance spectroscopy and gel permeation chromatagraphy,and the effect of capping reaction temperature and VBC amount on termination efficiency were investigated. The results showed that the（ p-vinylbenzyl） polybutadiene macromonomers could be synthesized with VBC as capping agent. Under the optimum conditions of capping reaction temperature0 ℃,mole ratio of VBC to polybutadienyllithium more than 8 /1,with tetrahydrofuran as polar regulator,the termination efficiency of polybutadiene macromonomer reached over 90%. The mechanism of side reactions which led to the decrease of termination efficiency were also discussed.

关 键 词：聚丁二烯大分子单体 负离子聚合 封端反应 苯乙烯基团 

分 类 号：TQ316.3[化学工程—高聚物工业]