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液体的粘度这个物理量是表征流体在受到切应力后在层流情况下对流动的阻力,是流体的一个重要物理常数。当高聚物溶解在溶剂中,其溶液有一个很明显的特征,那就是即使高聚物在溶液中的浓度非常小,溶液的粘度增加很多,可以大大超过原来纯溶剂的粘度。1930年斯陶丁格(Staudinger)提出此浓粘度(单位浓度的溶液粘度的增值百分数)η_(sp)/C 与高聚物的分子量成正比,从而可以由粘度来测定分子量。这个方法经过不断改善和充实后得到了很大的成功,溶液粘度法已程成为目前应用最广泛的高聚物分子量测定
Viscosity of a Liquid This physical quantity is a measure of the resistance of a fluid to flow under laminar flow after being subjected to shear stress and is an important physical constant of a fluid. When the polymer is dissolved in a solvent, there is a distinct characteristic of the solution that the viscosity of the solution increases much more than the viscosity of the original pure solvent even if the concentration of the polymer in the solution is very small. In 1930 Staudinger proposed that this viscosity, which is proportional to the solution viscosity, η sp / C, is proportional to the molecular weight of the polymer so that the molecular weight can be determined from the viscosity. This method has been greatly improved after continuous improvement and enrichment, solution viscosity method has become the most widely used polymer molecular weight determination