【摘要】 本文以二硫代苯甲酸异丁腈酯(CPDB)作为链转移剂,AIBN为引发剂,以N-异丙基丙烯酰胺(NIPAM)和2-(4-苯基偶氮苯氧基)乙基丙烯酸酯(PAPEA)为单体,利用RAFT聚合法合成了PNIPAM及其嵌段共聚物PNIPAM-b-PPAPEA。利用FT-IR、~1H NMR、GPC对PNIPAM及其嵌段共聚物的结构进行了表征。同时,通过TEM、DLS和UV等手段测定了该嵌段共聚物胶束的形貌及大小、胶束的光响应性和温度响应性。结果表明,PAPEA的RAFT聚合反应动力学曲线呈良好的线性关系,PNIPAM-b-PPAPEA分子量分布小于1.3;PNIPAM-b-PPAPEA在水相中自组装形成球形胶束,其粒径随PPAPEA链段分子量的增加而增大;胶束呈现出良好的光响应性;随着温度的升高,胶束粒径变小,显示出明显的温度响应性。更多还原

【Abstract】 In this paper,poly( N-isopropyl acrylamide)( PNIPAM) and its block copolymer poly( N-isopropyl acrylamide)-b-poly[2-( 4-phenylazophenoxy) ethyl acrylate]( PNIPAM-b-PPAPEA) were synthesized by the RAFT polymerization of NIPAM and PAPEA,using 2-cyanoprop-2-yl dithiobenzoate( CPDB) as a chain transfer agent and AIBN as initiator. The structure of PNIPAM and its block copolymerswascharacterized by FT-IR,1 H-NMR,and GPC.And,the morphology and size of block copolymer micelles,photo-and thermo-responsiveness were determined by TEM,DLS,and UV.The results showed that the kinetic curve of RAFT polymerization of PAPEA reveals good linear relationship,and the molecular weight distributions of PNIPAM-b-PPAPEAwas less than 1. 3;PNIPAM-b-PPAPEA in aqueous phase formed spherical micelles via self-assembly and the micelles size was increased with the increasing of the molecular weight of PPAPEA block; the micelles exhibited good photo-responsiveness; the micelles size became smaller with the temperature increased,which indicated that the micelles show obvious thermo-responsiveness.更多还原