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Electric Birefringence Relaxation Method for the Analysis of Polyelectrolyte Gel.

用于分析聚电解质凝胶的电双折射弛豫方法。

基本信息

批准号：
03805083
负责人：
UEDA Kazuyoshi
金额：
$ 1.09万
依托单位：
HIROSHIMA 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：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03805083/
关键词：
Electric birefringence Polymer gel

项目摘要

Recently, much interest has been focused on the thermoreversible gel of polysaccharides because of its physicochemical aspect of the gelation mechanism and the application as intelligent materials. Sol-gel transition of k-carrageenan has been studied extensively as a model of polysaccharide gel. However, there are few reports concerning the network structure of the gel because of the lack of appropriate method.In this study, we applied the electric birefringence relaxation method to investigate the network structure of the polysaccharide gel. So far, the electric birefringence method has been mainly used for properties of polymer solutions, but its application to gel has never been examined.We construct the equipment in order to observe the weak signal of the orientational motion of the structural component of the gel. When the rectangular electric pulse is applied to the Kerr cell, the electric birefringence signal from the gel was observed. The observation of the electric birefringence signal from the gel was the first time. The signal was found to consist of two processes, which correspond to the orientational motion of the junction zone and the deformation of the whole network structure of the gel. The size of the junction zone can be estimated by analyzing the relaxation process of the electric birefringence signal. These results indicate the possibility of the electric birefringence method to investigate the network structure of the gel.

近年来，多糖热可逆凝胶由于其物理化学方面的凝胶机理和作为智能材料的应用受到了广泛的关注。作为多糖凝胶的一种模式，k-卡拉胶的溶胶-凝胶转变已被广泛研究。然而，由于缺乏合适的方法，关于凝胶的网络结构的报道很少。本研究采用电双折射弛豫法对多糖凝胶的网络结构进行了研究。迄今为止，电双折射法主要用于聚合物溶液的性质分析，但其在凝胶中的应用尚未进行研究。为了观察凝胶结构组分取向运动的微弱信号，我们构建了该设备。当矩形电脉冲作用于克尔细胞时，观察到凝胶的双折射信号。首次观察到凝胶的电双折射信号。该信号由两个过程组成，分别对应于结区的定向运动和凝胶整体网络结构的变形。通过分析双折射信号的弛豫过程，可以估计结区的大小。这些结果表明电双折射法研究凝胶的网络结构是可行的。