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含有聚氧乙烯链(EO)的阴离子表面活性剂(a-S_a)兼有阴离子和非离子两类活性剂共同的优点,近年来在石油、轻工和化工行业中获得了广泛的应用。环氧乙烷的阶梯式加成,使这类a-S_a的加成产品成为具有一定EO数分布而非单一聚合度的调聚物。因EO加成数的多少及EO数的分布情况对活性剂的物化性能有很大影响,因此需要测定其EO数分布及纯度。 对聚氧乙烯型非离子表面活性剂EO数分布的测定,国内外已做了许多工作,而对a-sa EO数分布的测定目前很少报道。本文采用薄层色谱法(TLC)的一维展开和二维展开而不经断链反应测定
The anionic surfactant (a-S_a) containing polyoxyethylene chain (EO) combines the advantages of both anionic and non-ionic active agents. In recent years, it has been widely used in petroleum, light industry and chemical industry. Ethylene oxide ladder-type addition, so that this type of a-S_a addition products have a certain distribution of EO rather than a single degree of polymerization telomer. Because of the number of EO and the number of EO distribution of the physical and chemical properties of the active agent has a significant impact, it is necessary to determine the EO number distribution and purity. The determination of EO number distribution of polyoxyethylene nonionic surfactants has done a lot of work at home and abroad, but the distribution of a-sa EO number is seldom reported. In this paper, thin layer chromatography (TLC) one-dimensional and two-dimensional unfolded without the determination by chain scission