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蒸气压法(即 VPO 法)测分子量的特点是快速微量,重现性高,可测5万以下的分子量。本文介绍日立115型分子量测定仪的原理和实验过程。一、原理该法是基于稀溶液的通性即溶液蒸气压下降的原理。当溶液中溶有不挥发溶质时,溶液的蒸气压要比纯溶剂的蒸气压低(如图1)。S_1、S_2分别为溶剂和溶液的蒸气压曲线,在温度 T_1时溶液的蒸气压 P_1较溶剂的蒸气压 P_2为低,蒸气
Vapor pressure method (VPO method) to measure the molecular weight is characterized by rapid trace, reproducible, measurable molecular weight below 50,000. This article describes the Hitachi 115 molecular weight analyzer principle and experimental process. First, the principle The law is based on the principle of dilute solution of the vat pressure drop solution. When the solution is dissolved in non-volatile solute, the vapor pressure of the solution is lower than the pure solvent vapor pressure (Figure 1). S_1 and S_2 are the vapor pressure curves of the solvent and the solution, respectively. At the temperature T_1, the vapor pressure P_1 of the solution is lower than the vapor pressure P_2 of the solvent, and the vapor