A quasichemical lattice model for a binary mixture of hard rectangular parallelepipeds Application to systems composed of nematic and non-mesogenic molecules |
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Authors: | E. P. Sokolova A. Yu. Vlasov |
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Affiliation: | a Institute of Chemistry, Leningrad State University, Leningrad, U.S.S.R. |
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Abstract: | The hole lattice model of rectangular parallelepipeds is presented to describe the structural and excess thermodynamic properties of nematic-non-mesogenic mixtures. The molecular attractions are taken into account within the quasi-chemical approximation. A procedure for evaluating model parameters from data on the thermodynamic characteristics of pure components and the activity coefficients of the non-mesogen at infinite dilution at the nematic-isotropic transition temperature of the mesomorphic component is proposed. The mixing functions (enthalpy and volume), activity coefficient of the non-mesogen and the order parameters of the components are calculated at a molecular level for systems composed of 4-methoxybenzylidene-4'-propylaniline and a non-mesogen (tetrachlormethane, benzene and n-heptane). The calculated results are in quite good agreement with experiment in the temperature rang from 319·2 to 335·4 K. |
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