Phase Diagram of Poly(acrylamide)-poly(ethylene glycol)-water and Partition Coefficient of Acrylamide

Abstract

Abstract: It is found that when the two aqueous solutions of poly(acrylamide)(PAAm) and poly(ethylene glycol)(PEG) are mixed, an aqueous two-phase system can be formed. The top is the PEG-rich aqueous phase and the bottom is the mixture of rich PAAm and PEG aqueous phase. The phase diagrams of this system are made with gel permeation chromatography(GPC) and turbidity titration methods. As the molecule weight of PEG increases, the critical concentration of phase separation becomes lower. As the temperature of this system increases, the critical concentration of phase separation decreases at first, but when the temperature is higher than 55 ℃, it increases again. Acrylamide(AAm) can be partitioned in PAAm-PEG-H₂O aqueous two-phase system, the partition coefficient(K) of AAm in this system increases with increasing the temperature of phase equilibrium and the PAAm concentration, but decreases with increasing the PEG concentration.

Key words: Phase diagram, Poly(acrylamide), Poly(ethylene glycol), Acrylamide

CLC Number:

O631

TrendMD:

SHAN Guo-Rong, CAO Zhi-Hai, HUANG Zhi-Ming, WENG Zhi-Xue. Phase Diagram of Poly(acrylamide)-poly(ethylene glycol)-water and Partition Coefficient of Acrylamide[J]. Chem. J. Chinese Universities, 2005, 26(7): 1348.

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Phase Diagram of Poly(acrylamide)-poly(ethylene glycol)-water and Partition Coefficient of Acrylamide

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