含溴双官能团引发剂引发原子转移自由基嵌段共聚  

ATOM TRANSFER RADICAL BLOCK COPOLYMERIZATION USING 1,4-DIBROMOMETHYLBENZENE AS DIFUNCTIONAL INITIATOR

作　　者：邹友思[1] 庄荣传[1] 邱志平[1] 戴李宗[1] 

机构地区：[1]厦门大学材料科学系,福建厦门361005

出　　处：《高分子材料科学与工程》2001年第1期54-56,共3页Polymer Materials Science & Engineering

摘　　要：合成了对二溴甲基苯作为原子转移自由基聚合的双官能团引发剂 ,以对二溴甲基苯 /溴化亚铜 /联吡啶 (摩尔比 1/ 2 / 4 )为引发体系 ,进行极性单体甲基丙烯酸酯和非极性单体苯乙烯及不同的甲基丙烯酸酯之间的原子转移自由基嵌段共聚 ,得到了实测分子量与设计分子量相近 ,分子量分布小于 1.8的PEMA- PS- PEMA,PBMA- PS- PBMA,PMMA- PBMA- PMMA等多种三嵌段共聚物。Dibromomethylbenzene has been successfully used as new difunctional initiator in the atom transfer radical block copolymerization of styrene(St) and ethyl methacrylate(EMA) or butyl methacrylate(BMA), methyl methacrylate(MMA) and BMA. In the first step one of the monomers was polymerized in bulk using the initiating system 1,4 Dibromomethylbenzene/CuBr/2,2′ bipyridine in a mole ratio of 1∶2∶4 at 90 ℃. Subsequently the resulting polymers with active bromo end group structures were used as macroinitiators for the polymerization of the second monomerunder same conditions. The polymerizations were well controlled with a linear increase of molecular weights( n ) with conversion and relatively low polydispersities throughout the reactions. The triblock copolymers of BMA and St, EMA and St, MMA and BMA with predicted molecular wight(10000~50000) and narrower molecular weight distribution(1.2~1.7) were obtained. It is found that St only can be used s the first monomer when methacrylate is copolymerized with St.

关 键 词：原子转移自由基聚合 嵌段共聚 聚甲基丙烯酸酯 聚苯乙烯 

分 类 号：O631.5[理学—高分子化学]