α,α-二溴乙酸乙酯作双官能引发剂ABA型嵌段共聚物的合成
Synthesis of PSt-b-PBA-b-PSt and PMMA-b-PBA-b-PMMA Triblock Copolymers by Atom Transfer Radical Polymerization with Ethyl α,α-Dibromoacetate as Difunctional Initiator作者机构：北京化工大学材料科学与工程学院聚合物工程系北京100029
出 版 物：《高等学校化学学报》 (Chemical Journal of Chinese Universities)
年 卷 期：2000年第21卷第6期
页 面：980-982页
核心收录：
学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070305[理学-高分子化学与物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学]
主 题：α,α-二溴乙酸乙酯 ABA型 ATRP 嵌段共聚物
摘 要：Ethyl α,α dibromoacetate was confirmed to be a difunctional initiator for the atom transfer radical polymerization of n butyl acrylate by means of gel penetration chromatography. When the polymerization of n butyl acrylate was carried out at different molar ratios of ethyl α,α dibromoacetate and ethyl α bromopropionate with CuBr/2,2′ bipyridine as the catalyst, polymers with bimodal molecular weight distributions were obtained, consisting of two narrowly distributed fractions, one of which was of a molecular weight double the other. Poly( n butyl acrylate) obtained with ethyl α,α dibromoacetate as the difunctional initiator was further used as the macroinitiator for styrene and methyl methacrylate in the presence of CuBr/2,2′ bipyridine respectively to prepare ABA triblock copolymers. It was found that high blocking efficiency was obtained for styrene. However, the polymer with bimodal molecular weight distribution was obtained for methyl methacrylate with a low molecular weight peak corresponding to that of poly( n butyl acrylate) macroinitiator. If the blocking polymerization was conducted with CuCl/ 2,2′ bipyridine as the catalyst to replace CuBr/2,2′ bipyridine, a high blocking efficiency was also obtained. [WT5HZ]
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