An Estimation of the Latent Liquid Crystal-Isotropic Liquid Transition Temperature of a Non-Liquid Crystalline Compound by Equal G Analysis

Abstract

Abstract A calculation of nematic liquid crystal-isotropic liquid transition temperature-composition curves of binary phase diagrams, in which one of the components is a non-liquid crystalline compound, has been examined by means of equal G analysis, one of the thermodynamic treatments reported by Van Hecke. Five liquid crystals, azoxybenzene derivatives, are used for the calculation and one of them is assumed to be a non-liquid crystalline compound. As a result, if the latent transition entropy of a non-liquid crystalline compound can be expected in advance, the latent nematic liquid crystal-isotropic liquid transition temperature can be obtained more precisely than by the extrapolation method used so far. Even if the latent transition entropy cannot be expected in advance, a comparison between calculations of the two binary systems in which a non-liquid crystalline compound is common, can give the precise latent transition temperatures and the transition entropies.