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采用氯化亚铜/2,2’-联二吡啶催化体系,2,5-二溴己二酸二乙酯为引发剂,甲醇为溶剂运用希莱克技术,利用原子转移自由基聚合(ATRP)方法合成了ABA型三嵌段共聚物PDEAEMA-b-PMPC-b-PDEAEMA.1H NMR和GPC(凝胶渗透色谱)对聚合物组成、结构及分子量进行了表征,利用透光率、粘度测定研究了嵌段共聚物溶液的pH敏感性,利用表面张力测定、荧光探针和透射电镜研究了嵌段共聚物胶束化作用,确定了共聚物水溶液的临界胶束浓度(CMC).结果表明所合成的ABA型三嵌段共聚物水溶液具有pH敏感性,其临界相变pH 7～7.5.调节溶液pH值可实现嵌段共聚物胶束化形成“花状”胶束,并测定了其临界胶束浓度.
The catalysts were prepared by the method of Silek technology and atom transfer radical polymerization (ATRP) using cuprous chloride / 2,2’-bipyridyl catalysis system, diethyl 2,5-dibromoadipate as initiator and methanol as solvent. Methods The composition, structure and molecular weight of the polymer were characterized by PDEAEMA-b-PMPC-b-PDEAEMA.1H NMR and GPC (gel permeation chromatography) The pH sensitivity of the block copolymer solution was investigated by means of surface tension measurement, fluorescence probe and transmission electron microscopy, and the critical micelle concentration (CMC) of the copolymer aqueous solution was determined. The synthesized ABA triblock copolymer aqueous solution has pH sensitivity and its critical phase transition is pH 7 ~ 7.5. The pH of the solution can be used to form micelles of “block copolymer” The critical micelle concentration.