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Phase transition properties in a lattice gas model of liquid crystals, consisting of rigid rods with attractive, anisotropic, nearest-neighbor interaction, are calculated with the method of Guggenheim-Flory-DiMarzio lattice statistics. It is shown that in this model the properties of the isotropic-anisotropic phase transition are altered by a bundling phenomenon, in which parallel molecules are grouped into energetically favorable clusters of various sizes. The bundling of molecules increases the density at which the isotropic-anisotropic phase transition occurs and decreases the values of the accompanying density and order parameter discontinuities at the transition. The cases where the molecular length to breadth ratio l = 5, 10 are calculated and illustrated.
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Ping Sheng (1973) studied this question.
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