用凝胶色谱法在室温下测定聚对苯二甲酸丁二醇酯(PBT)分子量和分子量分布的研究

DETERMINATION OF MOLECULAR WEIGHT AND MOLECULAR WEIGHT DISTRIBUTION OF POLYBUTYLENE TEREPH- THALATE BY GPC AT ROOM TEMPERATURE

通过溶度参数等有关理论进行计算、分析及实验验证,找到了邻氯苯酚/氯仿(1/3,ml/ml)可作为聚对苯二甲酸丁二醇酯(PBT)的溶剂和室温淋洗剂。用自行制备的一系列分子量不同的PBT样品标定柱,建立了用凝胶色谱在室温下测定PBT分子量和分子量分布的方法,并得到了PBT和PS在邻氯苯酚/氯仿(1/3,ml/ml)体系中,25.0℃的[η]-M方程。发现在此GPC体系中普适标定法可以适用。

Molecular weight and molecular weight distribution of PBT were determined by GPC at room temperature. A room temperature solvent of o-chlorophenol / chloroform mixture (1 : 3 by volume ) was found by means of theoretical calculation of the solubility parameters. GPC experiments showed that this mixed solvent can be used as an eluant of GPC at room temperature.PBT fractions were obtained by fractionation and were characterized and used as standards to calibrate the GPC column. [η]-M equations of PBT and PS in this mixed solvent at 25℃ were obtained. Universal calibration was found to be applicable for PBT in this system.