Swelling-contraction of sodium polyacrylate hydrogels in media with various pH values

被引：26
|
作者：
Elyashevich, G. K. [1 ]
Bel'nikevich, N. G. [1 ]
Vesnebolotskaya, S. A. [1 ]
机构：
[1] Russian Acad Sci, Inst Macromol Cpds, St Petersburg 199004, Russia
来源：
POLYMER SCIENCE SERIES A | 2009年 / 51卷 / 05期
基金：
俄罗斯基础研究基金会;
关键词：
PHASE-TRANSITION; CELLULOSE; NETWORKS; WATER; GELS;
D O I：
10.1134/S0965545X09050095
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The swelling kinetics of sodium polyacrylate gels has been studied in media with different pH values. The pH dependence of the degree of equilibrium swelling shows a maximum at pH 6. The degree of swelling decreases with an increase in the crosslink density, and this dependence follows an S-shaped pattern for all examined gels. When a gel swollen in media with pH 3-13 is dried in air, its contraction is reversible, while in the case of the gel swollen in acidic media at pH < 3, the process is irreversible owing to the replacement of sodium ions with protons.
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页码：550 / 553
页数：4
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