Abstract

The thixotropic properties of aqueous solutions of the following polysaccharides are studied: chitosan, its water-soluble derivative the sodium salt of chitosan succinamide, and the sodium salt of carboxymethyl cellulose. These polymers have been selected due to their physiological activity and the possibility of using them for biomedical purposes. Studying the effect of the polymer concentration on rheological behavior shows that if a dilute polysaccharide solution is taken for research, then the flow curve does not actually depend on the time of exposure to the shear strain; i.e., the system is thixostable and in equilibrium, in contrast to semidiluted solutions, which clearly demonstrate nonequilibrium and thixotropy. The solutions of the studied polysaccharides behave like thixotropic systems only in the concentration region where supramolecular structures are uniquely formed and the time required for their destruction is comparable with the experiment’s time.

中文翻译：

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某些多糖溶液的触变性

摘要

研究了以下多糖的水溶液的触变性：壳聚糖，其水溶性衍生物，壳聚糖琥珀酰胺的钠盐和羧甲基纤维素的钠盐。选择这些聚合物是由于它们的生理活性以及将其用于生物医学目的的可能性。研究聚合物浓度对流变行为的影响表明，如果采用稀多糖溶液进行研究，则流动曲线实际上并不取决于暴露于剪切应变的时间；反之，也就是说，与半稀释溶液相反，该体系是可触变性的，并且处于平衡状态，半稀释溶液清楚地表明了非平衡和触变性。