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本实验研究了葡聚糖水溶液的流变性能,选取了五种不同分子量的葡聚糖,分别考查了分子量、溶液浓度、溶液温度等因素对葡聚糖水溶液流变性的影响。结果显示,多数葡聚糖水溶液表现出牛顿流体的特性,而当葡聚糖分子量为531000,溶液浓度为30%时,溶液则表现出假塑性流体的性质,黏度随着剪切速率的提高而降低。当葡聚糖浓度较低时(≤1%),水溶液均表现出一种特殊的流变性,即黏度随着剪切速率增加先降低后升高,本研究对出现这一现象的原因进行了分析。
The experimental study of the dextran aqueous solution rheological properties, selected five different molecular weight dextran, were investigated the molecular weight, solution concentration, solution temperature and other factors on the rheological properties of dextran aqueous solution. The results showed that most of dextran aqueous solution showed the characteristics of Newtonian fluid, and when the dextran molecular weight of 531000, the solution concentration of 30%, the solution showed pseudoplastic fluid properties, viscosity with the shear rate increased reduce. When the dextran concentration is lower (≤1%), the aqueous solution shows a special rheological property, that is, the viscosity decreases first and then increases with the increase of the shear rate, and the reason for this phenomenon analysis.