修正的Mark—Houwink方程及其应用

MODIFIED MARK-HOUWIM EQUATION AND ITS APPLICATION

Ｍａｒｋ—Ｈｏｕｗｉｎｋ方程是高分子物理中最常用的方程之一，但由于该方程尚有不足之处，近年来国外学者对其加以修正，本文就此进行较详细的介绍。修正方程把特性粘数［η］与多分散聚合物的Ｍｎ、Ｍｗ和Ｍｚ相联系。该方程的有效性不仅经过大量具有连续性的和不连续性的分子量分布的聚合物实例的检验，并且通过具体实验指出由该方程确定三种平均分于量以及Ｍａｒｋ—Ｈｏｕｗｉｎｋ方程中Ｋ、ａ常数时的成功与不足之处。

The Mark-Houwink equation is one of the most frequently used equations in polymer physics,but it has some shortcomings. In recent years,some foreign scholars modified it,and we introducedthese detailedly in this paper. The modified equation corelated intrinsic viscosity[η] of PolydispersePolymers with Mn,Mwand Mz. the validity of this modified equation bed been proved by testing it fora large number of polymer cases with continuous and discontinuous molecular weight distrbution. Itwas also applied to evaluate three average molecular weights and K, a constants of Mark-Houwinkequation by experiments. The success and failure of this modified equation were indicated.