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本文采用交叉分级法和体积排斥色谱法(SEC)分别测定了聚对苯二甲酸乙二醇酯-聚四亚甲基醚多嵌段共聚物(PET-PTMG)的分子量分布和组成分布,并对两种方法的结果进行了比较。讨论了PET-PTMG的交叉分级和体积排斥色谱规律。结果表明:当共聚物的各组成相容性很差时(例如PET-PTMG),交叉分级对组成分离起主要作用,而对分子量分离的效率较差;由SEC法测定共聚物的组成分布只是反映组成随分子量变化的情况,而不能代表真实的组成分布;PET-PTMG～氯仿体系并不符合SEC普适校正规律。
In this paper, the molecular weight distribution and compositional distribution of polyethylene terephthalate-polytetramethylene ether multiblock copolymer (PET-PTMG) were determined by cross-classification and volume exclusion chromatography (SEC) The results of the two methods were compared. The cross-classification and volume exclusion chromatography of PET-PTMG were discussed. The results show that the cross-fractionation plays a major role in the separation of components when the composition of the copolymer is poorly compatible (such as PET-PTMG), while the efficiency of molecular weight separation is poor. The composition distribution of the copolymer determined by the SEC method is only It reflects the composition changes with the molecular weight, but can not represent the true composition distribution; PET-PTMG ~ chloroform system does not meet SEC universal calibration.