高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (7): 1262.

• 研究简报 • 上一篇    下一篇

聚N-异丙基丙烯酰胺水溶液在线团-球体转变过程中的溶剂化-去溶剂化效应

程镕时1,2, 杨琥1, 严晓虎1, 王治流1, 李利1   

  1. 1. 南京大学化学化工学院, 南京 210093;
    2. 华南理工大学高分子研究所, 广州 510640
  • 收稿日期:2000-07-13 出版日期:2001-07-24 发布日期:2001-07-24
  • 通讯作者: 程镕时(1927年出生),男,博士生导师,中国科学院院士,主要从事高分子溶液理论研究.
  • 基金资助:

    国家科委基础研究重大项目“高分子凝聚态的基本物理问题的研究”资助

The Solvation and Desolvation Process in the Course of Coil-globule Transition of Aqueous Poly( N-isopropylacrylamide) Solution

CHENG Rong-Shi1,2, YANG Hu1, YAN Xiao-Hu1, WANG Zhi-Liu1, LI Li1   

  1. 1. College of Chemistryand Technology, Nanjing Univsity, Nanjing 210093, China;
    2. Research Instituteof Polymer Science, South China Universityof Technology, Guangz hou 510640, China
  • Received:2000-07-13 Online:2001-07-24 Published:2001-07-24

关键词: 聚N-异丙基丙烯酰胺, 溶剂化, 去溶剂化, 线团-球体转变

Abstract: The temperature dependence of the specific refractive index increment d n /d c of aqueous poly( N-isopropylacrylamide) solution in the range of 20 ℃ to 35 ℃ were determined by a differential refractometer. The measured d n /d c of the solution decreases regularly and smoothly with increasing temperature until to the specific coil globule transition temperature of PNIPAM (around 32 ℃) and afterwards it increases with increasing temperature on the contrary. This extraordinary phenomenon is successfully explained and treated by a quantitative theory in terms of accompanying solvation desolvation process in the course of coil-globule transition of the polymer chain in solution.

Key words: Poly( N-isopropylacrylamide), Solvation, Desolvation, Coil-globule transition

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