由交替共聚物引发苯乙烯原子转移自由基聚合合成梳型聚苯乙烯  

Synthesis of Comb-Shaped Polystyrene via Atom Transfer Radical Polymerization Initiated by Alternating Copolymers

作　　者：吴蓉[1] 方艳[1] 翟光群[1] 

机构地区：[1]常州大学材料科学与工程系,江苏常州213164

出　　处：《高分子材料科学与工程》2013年第1期13-18,共6页Polymer Materials Science & Engineering

基　　金：常州市科技计划资助

摘　　要：以苯乙烯与马来酰亚胺的交替共聚物引发原子转移自由基聚合合成梳型聚苯乙烯,研究了络合剂结构、催化剂浓度、引发剂官能度与活性、反应温度等对聚合可控性、反应速率、支化程度等的影响。分别用气相色谱跟踪单体转化率、三检测器凝胶渗透色谱跟踪聚合物分子量、特性黏数等的变化。结果表明,利用高活性引发剂将导致形成自由基浓度过高,从而通过双基偶合终止形成高分子量组分,但通过降低催化剂浓度对提高聚合可控性效果不明显,而采用低官能度或活性引发剂可提高可控性,但导致所得聚合物支化程度较低。采用高官能度引发剂在较低温度下反应则既维持可控性又获得高度支化聚合物。The synthesis of comb-shaped polystyrene via atom transfer radical polymerization initiated by alternating copolymers of styrene and maleimide was explored, and the effect of ligand structure, concentration of catalyst, degree of functionality and activity of macroinitiator and temperature on the controlled behavior of the polymerization and the branched structure of the final polymer were investigated. The monomer conversion and molecular weight and intrinsic viscosity of the polymers were monitored by gas chromatography and triple-detected gel-permeation chromatography. The results show that the controllability cannot be improved by only reducing the concentration of catalyst, while using macroinitiators with a lower degree of functionality or low activity could enhance the controllability, but would give rise to sparsely branched polymer. However, polymerization at lower temperature using macroinitiators with a higher degree of functionality and high activity would lead to a controlled polymerization behavior and a highly branched architecture.

关 键 词：交替共聚物 苯乙烯 马来酰亚胺 原子转移自由基聚合 梳型聚合物 

分 类 号：TQ316.322[化学工程—高聚物工业]