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高聚物的分子量分布是和高聚物的物理化学性能密切相关的。一般测定分子量分布的实验方法是利用溶解度的不同,将各种不同分子量的分子进行分级,然后得各个级分的重量 W_i 和各个级分的平均分子量 M_i,画出分级曲线,再换成分子量分布曲线。例如;应用沉淀分级法,溶解分级法,薄膜分级法等,这些方法都需要十多天左右,甚至一个多月的时间,才能得出结果。有一种较简便的浊度滴定法,是在比较稀的高聚物溶
The molecular weight distribution of the polymer is closely related to the physicochemical properties of the polymer. Generally, the experimental method for determining the molecular weight distribution is to use different solubilities to classify molecules of different molecular weights, and then obtain the weight of each fraction W_i and the average molecular weight of each fraction M_i, draw a classification curve, and then change to the molecular weight distribution curve. For example; application of precipitation grading, dissolution grading, film grading, etc., these methods require more than ten days, or even more than a month’s time in order to draw the result. There is a simpler turbidity titration method that is more dilute polymer solution