ABA型两亲嵌段共聚物的合成及表征

SYNTHESES AND CHARACTERIZATION OF ABA TYPE AMPHIPHILIC BLOCK COPOLYMERS

以α ,α′ 二溴代二甲苯为引发剂 ,CuBr/2 ,2′ 联吡啶为催化体系 ,制备了双溴端基的分子量分布窄的聚苯乙烯 (MWD =1 18) .再以此作为大分子引发剂 ,实现了甲基丙烯酸对硝基苯酯的原子转移自由基聚合 ,制得了分子量可控且分子量分布窄的ABA型嵌段共聚物 ,再经水解、酸化 ,得到了聚甲基丙烯酸 b 聚苯乙烯 b

Atom transfer radical polymerization (ATRP) is a kind of useful method for the realization of living polymerization and syntheses of block copolymers. Polystyrene double-caped with bromine (MWD = 1.18), Br-PSt-Br, was synthesized by ATRP method using alpha, alpha'-dibromoxylene as initiator and CuBr/2,2-bipyridine as catalyse, and ligand at 110 degreesC. Then using the Br-PSt-Br as difunctional macromolecular initiator, ATRP of p-nitrophenyl methacrylate (NPMA) was realized and ABA type block copolymers, PNPMA-b-PSt-b-PNPMA, were synthesized. After hydrolyzation and acidition, amphiphilic ABA type block copolymers of methyl methacrylic acid and styrene, PMAA-b-PSt-b-PMAA, were prepared.