分子量分布对线性PNIPA/D2O溶液相变和扩散性质的影响

波谱学杂志 ›› 2011, Vol. 28 ›› Issue (3): 349-356.

分子量分布对线性PNIPA/D₂O溶液相变和扩散性质的影响

茹阁英^1,3，罗精明²，徐阳粼^1,3，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系, 湖北武汉，430074；3. 中国科学院研究生院，北京 100049

收稿日期:2010-11-16 修回日期:2010-11-30 出版日期:2011-09-05 发布日期:2011-09-05
基金资助:
国家自然科学基金资助项目(20921004).

Influence of Molecular Weight Distribution on Phase Transition and Self-Diffusion Behaviors of PNIPA/D₂O Solution

RU Ge-Ying^1,3, LUO Jing-Ming², XU Yang-Lin^1,3, 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. Electronics Department, Wuhan Institute of Technology, Wuhan 430074, China; 3. Graduate School of the Chinese Academy of Sciences, Beijing 100049, China

Received:2010-11-16 Revised:2010-11-30 Online:2011-09-05 Published:2011-09-05
Supported by:
国家自然科学基金资助项目(20921004).

摘要/Abstract

摘要：

利用¹H NMR谱和NMR自扩散方法研究了2种不同分子量分布的聚（N-异丙基丙烯酰胺）（PNIPA）的相变行为和扩散性质，发现分子量分布对PNIPA水溶液的相变行为和扩散性质都有明显影响. 在PNIPA水溶液的相变温度-浓度曲线中，宽分子量分布PNIPA的曲线下降比较平缓，而低分子量分布PNIPA的曲线先是快速降低，然后趋于缓和. 在扩散实验中，宽分子量分布PNIPA的自扩散衰减曲线呈现一定的曲率，而且温度越低，浓度越高，曲率越大；而窄分子量分布PNIPA的自扩散衰减曲线几乎是直线，受温度和浓度的影响很小. 通过基于经典的KohlrauschWilliams-Watts延展指数关系式来拟合宽分子量分布PNIPA自扩散系数和常规方程拟合窄分子量分布PNIPA自扩散系数的2种方法对比，可以得到基于Kohlrausch-Williams-Watts的延展指数拟合，有效改善分子量分布造成的影响.

关键词: 核磁共振（NMR）, 相变, 自扩散, 聚(N-异丙基丙烯酰胺), 分子量分布

Abstract:

¹H NMR and self-diffusion NMR techniques were used to investigate the phase transition and diffusion property of two PNIPAs with different molecular weight distribution (MWD) in D₂O. It was found that MWD had significant influence on the phase transition and diffusion behaviors of PNIPAs. The broad-MWD PNIPA showed a smoothly decreased lower critical solution temperature (LCST)concentration curve, whereas the curve of the narrowMWD PNIPA decreased rapidly first, and then became flat. In the selfdiffusion experiments, the decay curve of the broad-MWD PNIPA showed a certain curvature, which became bigger and bigger with decreasing temperature and increasing concentration. But the decay curve of the narrow-MWD PNIPA was a nearly straight line, and the influences of temperature and concentration were minimal. Comparing the mean self-diffusion coefficient analyzed by a stretched exponential relation based on the classical Kohlrausch-Williams-Watts equation with that fitted with Equation (1), it could be shown that the former method is less susceptible to the influence of MWD.

Key words: NMR, phase transition, self-diffusion, PNIPA, molecular weight distribution

中图分类号:

O482.53

茹阁英, 罗精明, 徐阳粼, 冯继文. 分子量分布对线性PNIPA/D₂O溶液相变和扩散性质的影响[J]. 波谱学杂志, 2011, 28(3): 349-356.

RU Ge-Ying, LUO Jing-Ming, XU Yang-Lin, FENG Ji-Wen. Influence of Molecular Weight Distribution on Phase Transition and Self-Diffusion Behaviors of PNIPA/D₂O Solution[J]. Chinese Journal of Magnetic Resonance, 2011, 28(3): 349-356.

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分子量分布对线性PNIPA/D₂O溶液相变和扩散性质的影响

Influence of Molecular Weight Distribution on Phase Transition and Self-Diffusion Behaviors of PNIPA/D₂O Solution

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