PDMAEMA多重环境响应行为的NMR研究

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

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. 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-Lin^1,3, LUO Jing-Ming², RU Ge-Ying¹, FENG Ji-Wen^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/Abstract

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（T₁、T₂）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

中图分类号:

O482.53

徐阳粼, 罗精明, 茹阁英, 冯继文. PDMAEMA多重环境响应行为的NMR研究[J]. 波谱学杂志, 2012, 29(2): 278-287.

XU Yang-Lin, LUO Jing-Ming, RU Ge-Ying, FENG Ji-Wen. NMR Study on Multiple Environmental Response Behaviors of Poly[2-(diethylamino)ethylmethacry-late](PDMAEMA)[J]. Chinese Journal of Magnetic Resonance, 2012, 29(2): 278-287.

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