用极性固定液改性高聚物PLOT柱的色谱性能研究

Investigation of Modified Polymer PLOT Column with Polar Liquid Phases

以乙基乙烯苯为单体、二乙烯苯为交联剂，在原位聚合制备的高聚物ＰＬＯＴ柱上用极性固定液ＰＥＧ－２０Ｍ和β，β＇－氧二丙腈进行改性，制备成高聚物气－液－固毛细管柱。通过对柱子热力学参数ｋ＇值的测定，可研究液相在分离过程中的作用及形成气－液－固分离机理所需的液相量。通过制作ｖａｎＤｅｅｍｔｅｒ曲线可研究柱子的动力学特性。发现在形成气－液－固柱后，曲线有明显的拐点，此时是否仍符合Ｇｏｌａｙ方程尚需作进一步的研究。

The PLOT column which is so-called gas-liquid-solid(GLS) chromatographic column was prepared by in situ copolymerization of ethylvinylbenzene (EVB) and divinylbenzene (DVB) and then by modification with some polar liquid phases, such as PEG-20M and β,β'-oxydipropionitrile. With the increase of percentage of liquid phase on the PLOT column the capacity factor k'increased at first and then decreased. Stationary phase forms a monomolecular layer on the adsorbent at the maximum k'. By measuring k'we can understand the formation process of the GLS column and determine the amount of required liquid phase for a certain separation. Generally, the optimum amount is near the maximum k'. The kinetic characteristics of column were also studied by preparing van Deemter curve. An apparent turning point was found in the curve when the column was coated with 0. 2%PEG-20M. The same phenomena were observed when the column was coated with 0. 5%β,β'-oxydipropionitrile. The kinetic characteristics of GLS chromatography are more complex than those of gas-liquid or gas-solid chromatography. Whether the GLS chromatography is still conforming to the Goly equation is necessary for further investigation. The column could take good separation of some hydrocarbon isomers.