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聚丙烯酸-b-聚(N-异丙基丙烯酰胺)嵌段共聚物的合成及其温度和pH值敏感性自组装研究
引用本文:李桂英,安英丽,何振平,马如江,张望清,史林启.聚丙烯酸-b-聚(N-异丙基丙烯酰胺)嵌段共聚物的合成及其温度和pH值敏感性自组装研究[J].高等学校化学学报,2006,27(5):956-960.
作者姓名:李桂英  安英丽  何振平  马如江  张望清  史林启
作者单位:南开大学高分子化学研究所,功能高分子材料教育部重点实验室,天津,300071
基金项目:国家自然科学基金(批准号:50273015,20474032),高等学校博士学科点专项科研基金,教育部新世纪优秀人才计划资助
摘    要:通过原子转移自由基聚合方法, 在丁酮/异丙醇混合溶剂中合成了分子量可控和分布较窄的聚丙烯酸叔丁酯-b-聚N-异丙基丙烯酰胺(PtBA-b-PNIPAM)嵌段共聚物, 用GPC和 1 H NMR对其结构进行了表征. PtBA-b-PNIPAM在甲苯中水解得到聚丙烯酸-b-聚N-异丙基丙烯酰胺(PAA-b-PNIPAM). 用动态光散射技术对PAA-b-PNIPAM在水溶液中的自组装行为随pH值和温度变化的响应进行了初步研究.

关 键 词:聚丙烯酸-b-聚N-异丙基丙烯酰胺  原子转移自由基聚合  自组装  环境敏感
文章编号:0251-0790(2006)05-0956-05
收稿时间:07 11 2005 12:00AM
修稿时间:2005-07-11

Synthesis and Self-assembly of Temperature- and pH-Sensitive Diblock Copolymer of Poly(acrylic acid)-b-poly(N-isopropylacrylamide)
LI Gui-Ying,AN Ying-Li,HE Zhen-Ping,MA Ru-Jiang,ZHANG Wang-Qing,SHI Lin-Qi.Synthesis and Self-assembly of Temperature- and pH-Sensitive Diblock Copolymer of Poly(acrylic acid)-b-poly(N-isopropylacrylamide)[J].Chemical Research In Chinese Universities,2006,27(5):956-960.
Authors:LI Gui-Ying  AN Ying-Li  HE Zhen-Ping  MA Ru-Jiang  ZHANG Wang-Qing  SHI Lin-Qi
Institution:Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, Nhnkai University, Tianjin 300071, China
Abstract:Diblock copolymer of poly(t-butyl acrylate)-b-poly(N-isopropylacrylamide)(PtBA-b-PNIPAM) with designed molecular weight and narrow molecular weight distributions was synthesized by sequential atom transfer radical polymerization(ATRP) of butyl acrylate and N-isopropylacrylamide using CuCl/(1,1,4,7,7-pentamethyl diethylenetriamine(PMEDTA) and CuCl/tris(2-dimethylaminoethyl)amine(Me6TREN) as the catalyst respectively in a mixture solvent of butanone and 2-propanol. Temperature- and pH-sensitive block copolymer of poly(acrylic acid)-b-poly(N-isopropylacrylamide)(PAA-b-PNIPAM) was realized after hydrolysis of PtBA-b-PNIPAM in toluene. PAA-b-PNIPAM existed as single molecules in aqueous solution at 25 ℃ and pH>pKa of PAA. Increasing temperature above LCST of PNIPAM or decreasing pH value lower pKa of PAA respectively formed PNIPAM-core micelles or PAA-core micelles.
Keywords:PAA-b-PNIPAM  Atom transfer radical polymerization(ATRP)  Self-assembly  Environmental-sensitivity
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