Abstract

The thermodynamic properties of 4-(octyloxy) benzoic acid (OBA) liquid crystal (LC) were investigated at infinite dilution by inverse gas chromatography (IGC). The phase transition temperatures of OBA LC were determined by differential scanning calorimetry (DSC) and IGC. The thermodynamic region was determined to be between 160 and 170 °C. Specific retention volumes were calculated using IGC measurements to prepare retention diagrams. The results from the diagrams were used to characterize the thermodynamic properties of the OBA LCs. Based upon these properties, the solvents used in this study were determined to be unsuitable for OBA LCs. The separation of structural isomer series (butyl acetate, butyl alcohol, and amyl alcohol series) was studied by an OBA LC coated Chromosorb W stationary phase in the thermodynamic region. This system was able to distinguish the isomers according to the determined selectivity coefficients.

摘要

4-（辛氧基）苯甲酸 (OBA) 液晶 (LC) 的热力学性质在无限稀释下通过反相气相色谱 (IGC) 进行了研究。OBA LC 的相变温度由差示扫描量热法 (DSC) 和 IGC 确定。热力学区域被确定为介于 160 和 170 °C 之间。使用 IGC 测量计算比保留体积以准备保留图。图表的结果用于表征 OBA LC 的热力学特性。基于这些特性，本研究中使用的溶剂被确定为不适合 OBA LC。结构异构体系列（乙酸丁酯、丁醇和戊醇系列）的分离通过 OBA LC 涂层 Chromosorb W 固定相在热力学区域进行研究。