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SYNTHESIS OF THREE-BLOCK COPOLYMER WITH TWO-FUNCTION-GROUP MACROINITIATORS
Author(s): WU Jianfeng, HUANG Zhibin, ZHANG Keda
Pages: 77-
80
Year: 2004
Issue:
5
Journal: POLYMER MATERIALS SCIENCE & ENGINEERING
Keyword: 大分子引发剂; 原子转移自由基聚合; 嵌段共聚物; 热分析;
Abstract: 合成了以聚乙二醇400和聚氨酯预聚物为主体,两端各带有2-溴丙酰氧基的两种大分子引发剂,并以此分别对苯乙烯和甲基丙烯酸甲酯进行原子转移自由基聚合(ATRP),得到了PS-PEG-PS,PS-PU-PS,PMMA-PEG-PMMA,PMMA-PU-PMMA四种"大-小-大"三嵌段共聚物,用 1H-NMR、GPC、DSC、TGA分别对其进行了表征和检测.结果表明,两种大分子引发剂均能引发合成分子量可控、分子量分布较窄的嵌段共聚物,两种大分子引发剂对MMA的聚合速度明显高于St.热分析表明,三嵌段中的小嵌段,无论是较软的PEG-400或较硬的PU,均可使PS及PMMA的Tg有不同程度的下降.
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