由特性粘数和凝胶渗透色谱(GPC)图谱计算各种平均分子量

Estimation of the Molecular Weights of a Polymer Sample Using Intrinsic Viscosity and Gel Permeation Chromatogram (GPC)

本文提出了对未知Mark-Howink常数的一个聚合物样品,从它的特性粘数和GPC图谱得到各种平均分子量的新方法。该方法对窄分布和宽分布的样品都适用,已用三组不同分子量分布和不同K和α的聚合物样品进行了验证。用该方法得到的各种平均分子量与已知K和α时用传统的普适法得到的结果是一致的。

A method for estimation of various average molecular weights including weight-average Mw, number-average Mn, viscosity-average M, and Z-average M2 has been developed by using GPC and intrinsic viscosity of a polymer sample. The method is suitable for narrow as well as broad distribution sample of polymers. for which the constants of Mark-Houwink equation are unknown. The validity of the method was tested using three groups of samples with different Mark-Houwink constants and molecular weights. The results obtained bythe method are in agreement with those obtained using universal calibration method which requires known Mark-Houwink constant.