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引言高分子溶液的特性粘数是一个十分重要的物理量。它和大分子的化学结构、分子量和大分子在溶液中的形态、尺寸大小等重要特性有关。特性粘数和分子量之间的联系更被广泛地利用于测定分子量。因此,如何准确而又简便地测定特性粘数值一向被人们所重视。无数实验事实表明,高分子溶液并非牛顿流体。特性粘数随切变速度的增加而下降,其下降量的大小随分子链刚硬程度、溶剂性能良好程度和分子量的增
Introduction Intrinsic viscosity of polymer solutions is a very important physical quantity. It and the chemical structure of the macromolecules, molecular weight and macromolecules in solution morphology, size and other important features. The link between intrinsic viscosity and molecular weight is more widely used to determine molecular weight. Therefore, how to determine the intrinsic viscosity value accurately and simply has always been valued by people. Numerous experimental facts show that the polymer solution is not Newtonian fluid. The intrinsic viscosity decreases with the increase of shear rate, and the size of the decrease depends on the degree of molecular chain rigidity, the solvent properties and the molecular weight