甲基丙烯酸二甲氨基乙酯季铵盐与苯乙烯两亲共聚物的共聚活性

以甲基丙烯酸二甲氨基乙酯季胺盐(QASDMAEMA)-溴代乙烷(MAEB)、溴代丁烷(MABB)、硫酸二甲酯(MADMS)及磷酸三甲酯(MATMP)季胺盐和苯乙烯(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.用元素分析确定两亲共聚物的组成,详细地研究了两类单体的共聚活性,比较了Finemann-Ross法和线性化(YBR)法,并得出四对共聚单体(MAEB/St、MABB/St、MADMS/St及MATMP/St)的竞聚率,其分别为:rMABB=0.44, rSt=0.15; rMAEB=0.66, rSt=0.36; rMADMS=0.66, rSt=0.27; rMATMP=0.34, rSt=0.49.最后,用Price-Alfrey的Q-e关系式研究了单体的共轭性和极性因子.

Reactivity ratios for the amphiphilic copolymers of quaternary ammonium salts of dimethylaminoethyl methacrylate and styrene

A new kind of amphiphilic copolymers with random composition was synthesized from radical copolymerization of quaternary ammonium salts of dimethylaminoethyl methacrylate (QASDMAEMA) with styrene (St) in the solution. The quaternary ammonium salts used were butyl bromide salt (MABB), ethyl bromide salt (MAEB), dimethyl sulfate (MADMS) and trimethyl phosphate (MATMP), respectively. The compositions of the copolymers were measured by the elementary analysis. The monomer reactivity ratios of QASDMAEMA and St were determined ( r MABB =0 44, r St =0 15; r MAEB =0 66, r St =0 36; r MADMS =0 66, r St =0 27; r MATMP =0 34, r St =0 49) by Finemann Ross and YBR methods, respectively. Finally, Price Alfrey Q e values were calculated from the reactivity ratios.