基于RAFT过程的MMA可控自由基聚合及嵌段共聚物的合成

Controlled Radical Homopolymerization and Block Copolymerization of Methyl Methacrylate Based on RAFT Process

用二硫代酯调控的可逆加成 -裂解链转移过程 ( RAFT)研究了 MMA的聚合动力学及分子量分布 ,分析了引发剂浓度和二硫代酯浓度对反应速度及可控性的影响 .用 RAFT方法合成了嵌段共聚物 PMMA-b-PS及带有自旋标记的嵌段共聚物 PMMA-b-PS.

Methyl methacrylate(MMA) was polymerized by the controlled radical polymerization based on reversible addition-fragmentation chain transfer(RAFT) process. The effects of initiator and dithioester concentrations on polymerization rate and polydispersity of the resulted polymers were investigated. A larger initiator concentration increases the polymerization rate but has little influence on the molecular weight which is mainly determined by the concentration of dithoiester. PMMA-block-polystyrene(PMMA-b-PS) and PMMA-block-poly(styrene-co-4-chloromethylstyrene) were synthesized by means of macroinitiator technique, with the latter being spin-labeled by polymer reaction with 4-hydroxy-2,2,6,6-tetramethylpiperidinyl-1-oxy.