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

Abstract

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

CLC Number:

O482.53

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

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