高氯酸银催化4-甲氧基苯乙烯阳离子聚合反应  

Cationic Polymerization of 4-Methoxystyrene Using Silver Perchlorate as Catalyst

作　　者：张妍婧 任家渊 杨熙鹏 黄琨 林星 林丽 ZHANG Yan-jing;REN Jia-yuan;YANG Xi-peng;HUANG Kun;LIN Xing;LIN Li(College of Science,Sichuan Agricultural University,Yaan 625014,China)

机构地区：[1]四川农业大学理学院,四川雅安625014

出　　处：《塑料工业》2020年第2期54-56,157,共4页China Plastics Industry

基　　金：四川省教育厅项目(17ZB0341);国家级大学生创新创业训练计划项目(201710626041)。

摘　　要：采用Ph2CHCl/AgClO4作为引发体系,实现了4-甲氧基苯乙烯的阳离子聚合,探究了添加剂、聚合温度及引发剂种类对阳离子聚合的影响,并采用凝胶渗透色谱(GPC)、红外光谱(IR)和基质辅助激光解吸电离飞行时间质谱(MALDI-TOFMS)进行了表征。结果表明,聚合反应中无添加剂或使用弱的Lewis碱时,反应速度较快,产物的分子量分布较宽。使用强Lewis碱二甲基硫醚作为添加剂,反应温度为0℃,Ph2CHCl/AgClO4/Me2S物质的量比为1.0/1.0/10,反应表现出活性聚合的特征。此外,引发剂芳甲基正离子与二甲基硫醚间的作用力大小对聚合中的引发过程影响较大,二苯甲基正离子与三苯甲基正离子表现出较高的引发活性。4-Methoxystyrene was employed for cationic polymerization using Ph2 CHCl/AgClO4 as initiating system.Effects of additives,polymerization temperature and initiator on the cationic polymerization were investigated.The polymers were characterized by gel permeation chromatography(GPC)、infrared absorption spectroscopy(IR)and matrix-assisted laser desorption/ionization time-offlight mass spectrometry(MALDI-TOF-MS).The results showthat the polymerization is in fast reaction rate and broad molecular weight distribution(MWD)without addictive or using weak Lewis base(methyl phenyl sulfide and thiophene).Cationic polymerization of 4-methoxystyrene in the presence of strong Lewis base(dimethyl sulfide)is slow,reaching low conversion and narrowMWD.It shows living features when the cationic polymerization is initiated by Ph2 CHCl/AgClO4/Me2 S(1.0/1.0/10 molar ratio)at 0℃.Meanwhile,initiation process is remarkably influenced by the interactions between the initiators and dimethyl sulfide.Diphenyl methyl cation and triphenyl methyl cation show high initiating activity.

关 键 词：阳离子 活性聚合 4-甲氧基苯乙烯 LEWIS碱 

分 类 号：TQ316.323[化学工程—高聚物工业]