Synthesis and self-assembly of temperature and anion double responsive ionic liquid block copolymers

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• 作者：Ju Liang ; Wenlan Wu ; Junbo Li ; Chen Han ; Shijie Zhang…
• 关键词：ionic liquid block copolymer (ILBC) ; self ; assembly ; micelles ; stimulus ; responsive polymer nanoparticle
• 刊名：Frontiers of Materials Science
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：9
• 期：3
• 页码：254-263
• 全文大小：1,883 KB
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• 作者单位：Ju Liang (1)
  Wenlan Wu (2)
  Junbo Li (1)
  Chen Han (1)
  Shijie Zhang (1)
  Jinwu Guo (1)
  Huiyun Zhou (1)
  
  1. College of Chemical Engineering & Pharmaceutics, Henan University of Science & Technology, Luoyang, 471023, China
  2. Medical School, Henan University of Science & Technology, Luoyang, 471003, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Chemistry
  Chinese Library of Science
  
• 出版者：Higher Education Press, co-published with Springer-Verlag GmbH
• ISSN：2095-0268

文摘

In this paper, double hydrophilic ionic liquid block copolymers (ILBCs), poly(N-isopropylacrylamide)-block-poly[1-methyl-3-(2-methacryloyloxy propylimidazolium bromine)] (PNIPAM-b-PMMPImB), were polymerized by two-step reversible addition-fragmentation chain transfer (RAFT) process. The composition and molecular weight distributions of ILBCs were characterized using 1HNMR and gel permeation chromatography (GPC). The self-assembly and temperature- and anion-responsive behaviors of ILBCs were investigated by UV-Vis spectroscopy, TEM and dynamic light scattering (DLS). With increasing the concentration of (CF3SO2)2N?/sup>, the micellization of self-assembling PNIPAM-b-PMMPImB was induced to form a core—shell structure containing the core with hydrophilic PMMPIm-(CF3SO2)2N?/sup> surrounded by the shell of PNIPAM via the anion-responsive properties of ILBCs. However, upon temperature increasing, PNIPAM-b-PMMPImB formed the micelles composing of PNIPAM core and PMMPImB shell. The ionic liquid segment with strong hydrophilic property enhanced the hydrogen bonding interaction which expanded the temperature range of phase transition and increased the lower critical solution temperature (LCST) of the system. These results indicate that ILBCs prepared in this paper have excellent temperature and anion double responsive properties, and may be applied as a kind of potential environmental responsive polymer nanoparticles.