Chinese Journal of Magnetic Resonance ›› 2007, Vol. 24 ›› Issue (4): 487-493.

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An NMR Study on Phase Transition of PNIPAAM in Water/Methanol Mixtures

WU Wen-peng1,2,WANG Nian1,2,FENG Ji-wen1*   

  1. 1.State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics (Wuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences), Wuhan 430071, China; 
    2.Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences, Beijing 100049, China
  • Received:2007-06-11 Revised:2007-07-31 Online:2007-12-05 Published:2007-12-05
  • About author:*Corresponding author:Feng Ji-wen,Tel:027-87197343,E-mail:jwfeng@wipm.ac.cn.
  • Supported by:

    国家自然科学基金项目资助(10474116).

Abstract:

In this article, the phase transition of polymer PNIPAAM in water/methanol mixtures was studied by nuclear magnetic resonance (NMR) spectroscopy. It was found that 1H NMR spectrum, relaxation time and diffusion coefficient of PNIPAAM changed dramatically when phase transition occurred at ~6 mol % methanol and reentrant transition occurred at ~36 mol % methanol. These results indicate that NMR spectroscopy can be used to characterize phase transition of PNIPAAM in water/methanol mixture sensitively.

Key words: NMR, phase transition, water, methanol

CLC Number: