The Solvation and Desolvation Process in the Course of Coil-globule Transition of Aqueous Poly( N-isopropylacrylamide) Solution

Chem. J. Chinese Universities ›› 2001, Vol. 22 ›› Issue (7): 1262.

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The Solvation and Desolvation Process in the Course of Coil-globule Transition of Aqueous Poly( N-isopropylacrylamide) Solution

CHENG Rong-Shi^1,2, YANG Hu¹, YAN Xiao-Hu¹, WANG Zhi-Liu¹, LI Li¹

1. College of Chemistryand Technology, Nanjing Univsity, Nanjing 210093, China;
2. Research Instituteof Polymer Science, South China Universityof Technology, Guangz hou 510640, China

Received:2000-07-13 Online:2001-07-24 Published:2001-07-24

Abstract

Abstract: The temperature dependence of the specific refractive index increment d n /d c of aqueous poly( N-isopropylacrylamide) solution in the range of 20 ℃ to 35 ℃ were determined by a differential refractometer. The measured d n /d c of the solution decreases regularly and smoothly with increasing temperature until to the specific coil globule transition temperature of PNIPAM (around 32 ℃) and afterwards it increases with increasing temperature on the contrary. This extraordinary phenomenon is successfully explained and treated by a quantitative theory in terms of accompanying solvation desolvation process in the course of coil-globule transition of the polymer chain in solution.

Key words: Poly( N-isopropylacrylamide), Solvation, Desolvation, Coil-globule transition

CLC Number:

O631

TrendMD:

CHENG Rong-Shi, YANG Hu, YAN Xiao-Hu, WANG Zhi-Liu, LI Li . The Solvation and Desolvation Process in the Course of Coil-globule Transition of Aqueous Poly( N-isopropylacrylamide) Solution[J]. Chem. J. Chinese Universities, 2001, 22(7): 1262.

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The Solvation and Desolvation Process in the Course of Coil-globule Transition of Aqueous Poly( N-isopropylacrylamide) Solution

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