双官能团引发剂进行的基团转移嵌段共聚

Group Transfer Block Copolymerization by Bifunctional Initiators

嵌段共聚物的合成技术有较大的可靠性和预见性,并可提供别的聚合物所不能达到的特殊性能。用基团转移聚合的方法进行丙烯酸酯类极性单体室温下的活性聚合,能得到具有预定链长、嵌段纯度和多分散性指数小的嵌段共聚物。用双官能团引发剂进行基团转移嵌段共聚,可减少加单体的次数,避免引进杂质,且能合成用单官能团引发剂所无法得到的A—B—

The group transfer block copolymerization of methacrylates and acrylates with bifunctional initiators and benzoate catalyst was reported. ABA-triblock copolymers of MMA and BA, MMA and BMA, MMA and EM A with predetermined molecular weight and low polydispersity were obtained. When copolymerizations of different kinds of methacrylates were carried out, the monomer with larger steric hindrance must be used as the first monomer; when copolymerizations of methacrylate and aery-late were carred out, methacrylate must be used as the first monomer. The copolymers were characterized by 'H NMR, GPC and DSC.