α－甲基丙烯酸2，3－环氧丙基酯的选择性阴离子聚合

Selective Anionic Polymerization of 2,3-Epoxypropyl Methacrylate

通过对α－甲基丙烯酸２，３－环氧丙基酯双键的选择性阴离子聚合的研究发现：在较低温度下（＜－４０℃），聚合中的副反应主要发生在引发阶段，以引发剂与单体中环氧基的副反应为主；当温度较高时（＞－２０℃），则易出现交联现象而难以进行双键的选择性聚合。ＧＰＣ、１ＨＮＭＲ及ＦＴＩＲ鉴定表明，在较低温度下用１，１′二苯基己基锂作引发剂可合成每个重复单元上均定量带有的环氧基的单分散（ ＜１．１０）官能性聚合物，该聚合物易溶于多种溶剂。

The double bond selective anionic polymerization of 2, 3-epoxy propyl methacrylate has been carried out.It is found that the dominant by-reaction occurred in initiation process at lower temperature(<-40℃),not in propagating period,because of the interaction between initiator and epoxy group of monomer.This by-reaction can be restricted by the use of initiator with lower reactivity.On the other hand,higher polymerization temperature(>-20℃)will result in the cross-linking reaction, so it is difficult to control the double bond selective polymerization.GPC.1H NMR and FTIR measurements indicate that a soluble functional polymer with an epoxy group in each repeating unit and monodispersity has been prepared by proceeding the polymerization with 1,1'-diphenylhexyllithium in THF at lower temperature.