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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (15): 1803-1810. 上一篇    下一篇

研究论文

温度/pH敏感性嵌段共聚物P(HEMA-co-DEAEMA)-b-PDEAM-b-P(DEAEMA-co-HEMA)的合成与性质研究

齐晓君1, 刘守信*,1, 刘腾2, 党莉1, 杨曦1, 雨薇娜1, 王红梅1   

  1. (1应用表面与胶体化学教育部重点实验室 陕西师范大学化学与材料科学学院 西安 710062)
    (2西北工业大学材料科学与工程学院 西安 710072)
  • 投稿日期:2010-12-20 修回日期:2011-02-25 发布日期:2011-04-12
  • 通讯作者: 刘守信 E-mail:liushx@snnu.edu.cn
  • 基金资助:

    国家自然科学基金

Synthesis and Characterization of Temperature- and pH-Sensitive P(HEMA-co-DEAEMA)-b-PDEAM-b-P(DEAEMA-co-HEMA) Block Copolymers

Qi Xiaojun1; Liu Shouxin*,1; Liu Teng2; Dang Li1; Yang Xi1; Yu Weina1; Wang Hongmei1   

  1. (1Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Materials Science, Shaanxi Normal University, Xian 710062)
    (2School of Materials Science and Engineering, Northwestern Polytechnical University, Xian 710072)
  • Received:2010-12-20 Revised:2011-02-25 Published:2011-04-12
  • Supported by:

    the National Natural Science Foundation of China

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利用原子转移自由基聚合方法(ATRP)合成了组成递变的嵌段共聚物P(HEMA-co-DEAEMA)-b-PDEAM-b- P(DEAEMA-co-HEMA). 用FTIR, 1H NMR和GPC技术表征了聚合物的组成、结构、分子量及其分布. 通过透光率测定、粘度、激光粒度分析和透射电镜研究了共聚物组成、温度及溶液pH对其溶液相行为和胶束化作用的影响. 结果表明: 所合成的嵌段共聚物具有温度和pH敏感性, 共聚物水溶液的低临界溶解温度(LCST)随HEMA量的增加而降低, 临界相变pH随HEMA量的增加而降低, 温度和pH诱导均可实现嵌段共聚物的胶束化. 控制HEMA量可以调控嵌段共聚物的LCST和pKa.

关键词: 温度/pH敏感性, N,N-二乙基丙烯酰胺, N,N-二乙基胺基甲基丙烯酸乙酯, 原子转移自由基聚合, 嵌段共聚物

ABA type triblock compolymers poly(2-hydroxyethyl methacrylate-co-2-N,N-diethylamino ethyl methacrylate)-b-poly(N,N-diehylacryamide)-b-poly(2-hydroxyethyl methacrylate-co-2-N,N-diethylamino ethyl methacrylate) [P(HEMA-co-DEAEMA)-b-PDEAM-b-P(DEAEMA-co-HEMA)] were synthesized via atom transfer radical polymerization (ATRP). The synthesized triblock copolymers were characterized by FT-IR, 1H NMR and GPC techniques. The temperature and pH sensitivities of the triblock copolymer aqueous solutions were investigated by transmittance measurements, viscosity, laser particle size analysis and transmission electron microscope. The results show that the resultant block copolymers have temperature and pH sensitivities, the lower critical solution temperature (LCST) of the copolymers decreases with increasing of the HEMA content in the triblock copolymers, and the critical phase transition pH of the triblock copolymer solutions also decreses with increasing of the HEMA content in the copolymers. The micellization of triblock copolymers can be realized by changing of temperature or pH. The LCST and pKa of the block copolymers can be adjusted by controlling HEMA content in the copolymers.

Key words: temperature/pH-sensitivity, N,N-diethylacryamide (DEAM), 2-N,N-diethylamino ethyl methacrylate (DEAEMA), atom transfer radical polymerization (ATRP), block copolymer