甲基丙烯酸二甲氨基乙酯溴代烷季铵盐与苯乙烯共聚合的研究

以甲基丙烯酸二甲氨基乙酯溴代乙烷（ Ｍ Ａ Ｅ Ｂ） 或丁烷（ Ｍ Ａ Ｂ Ｂ） 季胺盐与苯乙烯（ Ｓｔ）为单体，采用溶液自由基共聚合方法，合成了一类新型阳离子两亲共聚物．详细地研究了聚合条件及共聚物的溶解性．共聚物“亲油”和“亲水”单元的无规结构被 Ｉ Ｒ、１ Ｈ Ｎ Ｍ Ｒ 及１３ Ｃ Ｎ Ｍ Ｒ所证实．最后，用线性化（ Ｙ Ｂ Ｒ） 法分别求得 Ｍ Ａ Ｅ Ｂ／ Ｓｔ 和 Ｍ Ａ Ｂ Ｂ／ Ｓｔ 的单体竞聚率，ｒ Ｍ Ａ Ｂ Ｂ ＝０４４ ，ｒ Ｓｔ ＝ ０１５ ，ｒ Ｍ Ａ Ｅ Ｂ＝ ０６６ ，ｒ Ｓｔ＝ ０３６ ．

STUDY ON COPOLYMERIZATION OF QUATERNARY ALKYL SALTS OF DIMETHYLAMINOETHYL METHACRYLATE WITH STYRENE

A new kind of amphiphilic random copolymers has been synthesized by radicalcopolymerization of quaternary alkyl salts of dimethylaminoethyl methacrylate( Q A S D M A E M A) with styrene ( St) in solution ,in which the salts are butyl bromide salt( M A B B) and ethyl bromidesalt ( M A E B) ,respectively . Variousexperimental parametersofthe copolymerization andthe solubility ofcopolymers were studiedin detail. The structure ofcopolymers was determined by the spectra of I R, 1 H N M R and 13 C N M R, which areperfectly consistent with the expected macro molecular structure of the random copolymerwith both hydrophobic and hydrophilic chain units. Finally ,monomer reactivity ratios of M A B B/ St and M A E B/ St were obtained ,r M A B B= 0 44 , r St = 0 15 ; r M A E B= 0 66 , r St =0 36 ,using Y B R method .