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Kinetic Research for Separation Function of Lonic Polymer Gel

离子聚合物凝胶分离功能的动力学研究

基本信息

批准号：
63550705
负责人：
NAKANO Yoshio
金额：
$ 1.28万
依托单位：
Shizuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550705/
关键词：
Ionic Polymer Gel Swelling and Shrinkage pH Ion Exchange Electroryte Donnan Equilibrium Electric Field ドナン平衝官能基膨潤収縮現象高分子鎖の拡散係数電解質水溶液

项目摘要

The dependence of gel swelling behavior and ionic behavior on external conditions (salt concentrations, pH, electric field) were investigated experimentally and theoretically. The results are as follows :1. The effects of electrolytes and pH on the swelling behavior of acrylamide gel containing both acrylic acid and trimethyl-N-acryloyl-3-aminopropyl ammonium chloride were investigated. It was found that swelling behavior could be explained to consider the dissociation of charged groups and ion exchange between the gel and the outer solution. The model based on Donnan equilibrium theory was found to describe the swelling behavior of the gel and the concentrations of freely mobile ions in the gel after ion exchange.2. The mechanism of shrinkage and dehydration of ionic hydrogels packed in an electric cell were investigated on the basis of the distribution of pH around the gel, the Na^+ ion concentration within the gels packed in the cell and the dehydration rate. It was found that shrinkage and dehydration of the ionic gels take place through the following processes :(1) generation of H^+ and OH^- ions by electrolysis ; (2) ion exchange between H^+ ions generated on the anode and Na^+ ions dissociated originally within the gels ; (3) accumulation of Na^+ ions near the cathode by electrophoresis ; and (4) increase in ionic strength near the cathode caused by process (3). Therefore, the shrinkage and dehydration of ionic gels depend on the generation of H^+ ions by electrolysis and electrophoresis of Na^+ ions.

实验和理论研究了凝胶膨胀行为和离子行为对外界条件（盐浓度、pH、电场）的依赖性。研究结果如下：1。研究了电解质和pH对含有丙烯酸和三甲基- n -丙烯酰-3-氨基丙基氯化铵的丙烯酰胺凝胶溶胀行为的影响。发现溶胀行为可以用带电基团的解离和凝胶与外溶液之间的离子交换来解释。建立了基于Donnan平衡理论的模型来描述凝胶的膨胀行为和离子交换后凝胶中自由移动离子的浓度。根据凝胶周围pH值的分布、凝胶内部Na^+离子浓度和脱水速率，研究了离子水凝胶在电池中收缩脱水的机理。研究发现，离子凝胶的收缩和脱水是通过以下过程发生的：(1)电解生成H^+和OH^-离子；(2)阳极上生成的H^+离子与凝胶内原解离的Na^+离子之间的离子交换；(3)阴极附近Na^+离子的电泳积累；(4)过程(3)引起阴极附近离子强度增加。因此，离子凝胶的收缩和脱水取决于电解和电泳Na^+离子生成H^+离子。