ATRP法制备两亲性嵌段共聚物的研究

SYNTHESIS OF AMPHIPHILIC BLOCK COPOLYMERS BY ATOM TRANSFER RADICAL POLYMERIZATION

以α 溴代丙酸乙酯 (EPN Br)为引发剂、氯化亚铜 (CuCl)和联二吡啶 (bpy)组成的混合体系为催化剂 ,引发苯乙烯聚合 ,得到了端基为卤原子的单分散聚苯乙烯 (PS X)预聚体 .以此PS X为大分子引发剂、CuCl和N ,N ,N′ ,N″ ,N″ 五甲基二亚乙基三胺 (PMDETA) bpy的混合体系为催化剂 ,引发N ,N 二甲基丙烯酰胺(DMAA)聚合 ,得到了分子量分布较窄的聚苯乙烯 b 聚N ,N 二甲基丙烯酰胺 (PS b PDMAA)两亲性嵌段共聚物 .考察了大分子引发剂的分子质量、聚合介质及配位剂等对聚合过程的影响 .并用GPC、IR、1 H NMR等对产物进行了表征 .研究结果表明 ,该聚合反应体系符合原子转移自由基聚合的特征 .

Polystyrene single-capped with halogen, PS-X, was synthesized by atom transfer radical polymerization (ATRP) method using ethyl-alpha-bromopropionate(EPN-Br) as initiator and CuCl/2,2'-bipyridine (bpy) as catalyst and ligand at 110degreesC. By using PS-X as macroinitiator and CuCl/1, 1, 4, 7, 7-penta-methyldiethylenetri-amine (PMDETA) or bpy as catalyst and ligand at 110degreesC, ATRP of N, N-dimethylaerylamide ( DMAA) was realized and functional amphiphilic block copolymers of poly( styrene-block-N,N-dimethylacrylamide) (PS-b-PDMAA) were synthesized. Furthermore, some factors including the molecular weight of macroinitiator, various solvents and ligand that influence the polymerization of DMAA have been studied. The properties of the PS-b-PDMAA copolymer were characterized by using GPC,IR and H-1-NMR analysis.