关于气相渗透法仪器常数问题——一个新模式

气相渗透法广泛用于测定齐聚物和低分子量聚合物的数均分子量(M_n)。分析文献数据和本文的实验证明,仪器常数K值随溶质的分子量而变化。本文提出了一种新的说明 VPO法 K值依赖于溶质分子量的模式,根据此模式,可清楚地说明这种依赖关系。

THE PROBLEM OF CALIBRATION COEFFICIENT K OF VPO MEASUREMENT ON THE MOLECULAR WEIGHT OF SOLUTE——A NEW MODEL

Vapour pressure osmometry is widely used in the determination of number average molecular weight, Mn, of oligomers and polymers in the lower range of values. We demostrate by means of analysis of the literature data and our own experiment that the calibration constant varies with the molecular weight of the solute. But up to now there has been no theory to describe the dependence. In this paper a new model has been put forward to describe this effect. With the help of the model, we can clearly describe the dependence of the solute on K.