乳酸乙酯中甲基丙烯酸甲酯的RAFT聚合研究

RAFT Polymerization of MMA in Ethyl Lactate

以绿色溶剂乳酸乙酯作为聚合介质,研究了(甲基)丙烯酸甲酯(MMA)单体的可逆加成-断裂链转移聚合(Reversible Addition-Fragmentation Chain Transfer Polymerization,RAFT).聚合动力学研究结果表明,乳酸乙酯中甲基丙烯酸甲酯(MMA)单体的聚合符合RAFT聚合特征.通过对所得聚合物的分子量及分子量分布表征都说明该催化体系下(甲基)丙烯酸甲酯类单体的聚合具有良好的可控性.同时还研究了其他乳酸酯类溶剂对MMA的RAFT聚合的影响,并讨论了溶剂对所得聚合物的规整度的作用.

Reversible addition fragmentation chain transfer （RAFT） polymerization of methacrylate was conducted under ethyl lactate reaction medium, using azobisisobutyronitrile as initiator and 2 cyanopro pan 2 yl benzodithioate as chain transfer agent.The well controlled polymerization shows the features of ＂living＂/controlled free radical polymerizations according to kinetic studies and polymer characteristics. The effects of solvent on the polymerization rate and controllability were investigated. The effects of chiral lactate esters solvents on PMMA isotacticity were also discussed.