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去年曾初步报导了以梯度淋洗法测定氯乙烯-丙烯腈共聚体分子量分布工作的一些结果,并肯定了氯乙烯-丙烯腈共聚体的丙酮-甲醇体系梯度淋洗法按分子量分级的有效性。本文对分级操作的若干细节作了些改进,在基本上消除倒级现象的基础上进行了若干条件试验。分级数据以董履和函数处理,并用加和法验证了实验的分级曲线。最后,我们把淋洗分级的结果同丙酮-甲醇体系在40℃下的柱上溶解分级的结果进行了比较,结果两曲线几乎重合在一起。因此,作为生产部门的常规分析来说,采用柱上溶解分级测定氯乙烯-丙烯腈共聚体的分子量分布,是一种简便迅速的方法。
Last year, preliminary reports on the results of the gradient elution method for molecular weight distribution of vinyl chloride-acrylonitrile copolymers were preliminary reported and the validity of molecular weight fractionation by gradient elution of acetone-methanol system of vinyl chloride-acrylonitrile copolymer was confirmed . This paper made some improvements on some details of the grading operation, and carried out a number of conditional tests on the basis of basically eliminating the inversions. The grading data is processed by Dong Lu and functions, and the grading curve of the experiment is verified by addition method. Finally, we compared the results of leaching and grading with the results of column dissolution and fractionation of acetone-methanol system at 40 ° C. As a result, the two curves almost coincided. Therefore, as a routine analysis in the manufacturing sector, the molecular weight distribution of the vinyl chloride-acrylonitrile interpolymer is determined by on-column dissolution fractionation as a quick and easy method.