α-溴代丁酸乙酯/CuBr/联吡啶体系引发的活性自由基聚合反应

LIVING FREE RADICAL POLYMERIZATION USING ETHYL α BROMOBUTYRATE/CuBr/BIPYRIDINE AS INITIATOR SYSTEM

用α溴代丁酸乙酯为引发剂，ＣｕＢｒ和２，２’联吡啶（ＢＰＹ）为催化剂，研究了ＭＭＡ、Ｓｔ、ＭＡ在８０℃下，ＭＭＡ在室温下（２０℃）的自由基活性聚合机理．通过转化率与数均分子量，理论分子量和实测分子量的关系，以及分子量分布，证明这些体系均具有活性聚合的特征．计算了三种聚合体系的动力学数据．讨论了温度、单体结构对聚合体系自由基活性特征的影响．

It was reported that living radical polymerization of styrene,methyl methacrylate,methyl acrylate was initiated at lower temperature using ethyl α bromobutyrate as an initiator and CuBr/2,2' bipyridine as a catalyst.MMA could undergo living free radical polymerization at 20℃.The “living” characteristics of the polymerization were studied.Low Mw/Mn of the polymers (1.15～1.45) was obtained.The kinetic data of the three systems were calculated and the factors affecting the “living” characteristic of the polymerization were discussed.