Study of Rheology of Tannin Obtained from Flower Buds of Terminalia chebula (Aralu) and Formaldehyde Reaction

S. Arasaretnam
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Abstract

The gelling and hardening reactions of tannin extracted from flower buds of Terminalia chebula with formaldehyde were analysed by parallel-plate rheometry techniques. In this study, a method to determine the rheological features of tannin-formaldehyde reactions both before and after the gel point was settled. The conversion from the liquid to solid state occurs at the gel point. Before the gel point, the zero shear viscosity can portray the behavior of the liquid resin. The value of this parameter rises as the polycondensation reaction proceeds, and at the gel point the weight average molecular mass turn into theoretically infinite.
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苦苣苔花蕾鞣质流变学及甲醛反应研究
采用平行平板流变法研究了从桔梗花蕾中提取的单宁与甲醛的胶凝硬化反应。本研究建立了测定凝胶点沉淀前后单宁-甲醛反应流变特性的方法。从液体到固体的转变发生在凝胶点。在凝胶点之前,零剪切粘度可以描述液态树脂的行为。该参数的值随着缩聚反应的进行而增大,在凝胶点分子量平均质量理论上趋于无限大。
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