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Acta Chimica Sinica ›› 2011, Vol. 69 ›› Issue (15): 1803-1810. Previous Articles     Next Articles

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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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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