波谱学杂志 ›› 2012, Vol. 29 ›› Issue (2): 278-287.

• 研究论文 • 上一篇    下一篇

PDMAEMA多重环境响应行为的NMR研究

徐阳粼1,3, 罗精明2,茹阁英1, 冯继文1*   

  1. 1. 波谱与原子分子物理国家重点实验室, 武汉磁共振中心(中国科学院 武汉物理与数学研究所), 湖北 武汉 430071; 
    2. 武汉职业技术学院 电子信息工程学院, 湖北 武汉 430074; 
    3. 中国科学院 研究生院, 北京 100049
  • 收稿日期:2011-05-20 修回日期:2011-05-23 出版日期:2012-06-05 发布日期:2012-06-05
  • 基金资助:

    国家自然科学基金资助项目(10974223).

NMR Study on Multiple Environmental Response Behaviors of Poly[2-(diethylamino)ethylmethacry-late](PDMAEMA)

 XU Yang-Lin1,3, LUO Jing-Ming2, RU Ge-Ying1, FENG Ji-Wen1*   

  1. 1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance (Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences), Wuhan 430071, China; 
    2. College of Electronic Information Engineering, Wuhan Polytechnic, Wuhan 430074, China;
    3. Graduate School of the Chinese Academy of Sciences, Bejing 100049, China
  • Received:2011-05-20 Revised:2011-05-23 Online:2012-06-05 Published:2012-06-05
  • Supported by:

    国家自然科学基金资助项目(10974223).

摘要:

利用原子转移自由基聚合(Atom Transfer Radical Polymerization, ATRP)合成了分子量分布较窄的聚甲基丙烯酸N, N-二甲氨基乙酯{Poly\[2(diethylamino)ethylmethacry-late], PDMAEMA}并通过对液体核磁共振氢谱(1H NMR)化学位移以及弛豫时间(T1T2)的测量,研究了聚合物PDMAEMA的温度敏感、pH敏感以及离子敏感3种环境敏感行为. 发现聚合物链段的运动性,以及温度和离子强度诱导的相变行为,都与体系的pH值具有强依赖关系. 室温下,聚合物链段的运动性随pH值的增大而降低. 酸性条件下,聚合物表现出离子敏感性,而不表现出温度敏感性. 碱性条件下,聚合物表现出温度敏感性,不表现出离子敏感性.

关键词: 核磁共振(NMR), PDMAEMA, pH敏感性, 温度敏感性, 离子敏感性

Abstract:

Poly[2-(diethylamino)ethylmethacry-late](PDMAEMA) with narrow molecular-weight distribution was synthesized by the atom transfer radical polymerization (ATRP) method. The thermo-sensitive, pH-sensitive and ionic sensitive behaviors of PDMAEMA chains in D2O solution were investigated by measuring 1H NMR spectra and relaxation times. It was found that the mobility, temperature-induced lower critical solution temperature (LCST) transition and ionic-strength-induced phase separation of PDMAEMA chains depend on pH of the solution. The mobility of PDMAEMA chains decreased with increasing pH value at room temperature. Ionic-strength-induced phase separation was observed at lower pH values, but not LCST transition. On the contrary, the LCST transition occurred at higher pH values, but not the ionic-strength-induced phase separation.

Key words: thermo-sensitive, ionic sensitive, NMR, PDMAEMA, pH sensitive

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