硝基甲苯异构体的液晶溶液热力学性质的色谱法研究

Study on Thermodynamic Quantities of Solution of Nitrotoiuene Isomers in Liquid Crystals with GLC

本文用气液色谱方法研究了o-,m-,p-硝基甲苯三种异构体在双(对己氧基苯甲酸)对苯二酚酯(PBHxB)和双(对庚氧基苯甲酸)对苯二酚酯(PBHpB)两种向列液晶固定液中无限稀薄条件下的活度系数,进而求得了超额焓,超额自由能和超额熵,同时得到溶解焓和溶解熵,并对结果进行了分析和讨论.

Thermodynamic results from gas-liquid chromatography (GLC) are reportod for three nonmesorphic solutes-nitrotoluene isomers in the nematic liquid crystal phages of two solvents PBHxB (p-phenylene bis-n-hexyloxybenzoate) and PBHpB (p-phenylene bis-n-heptyloxybenzoate). The specific retention volume can be obtained from retention time. Infinite dilution solute activity coefficients are obtained at several temperature in two nematic phase. From these, the following solute partial molar quantities are determined in each phase excess enthalpy, excess Gibbs free enthalpy, excess entropy, enthalpy of solution, and entropy of solution. The results are discussed in terms of the molecular solute-solvent interactions.