Abstract
The Flory lattice method has been utilized to study phase equilibria in solutions of disklike molecules. It is found that the critical disk diameter-to-width ratio x for the formation of the stable nematic phase is about 3.015. Temperature-concentration phase diagrams are studied for several values of x. For x8.6 isotropic and nematic phases are separated by a biphasic range of concentrations. Above x\ensuremath{\approxeq}8.6 a reentrant nematic feature appears, i.e., at a given temperature either of two pairs of phases, isotropic-nematic or nematic-nematic, occurred. The locations of the corresponding critical and triple points are computed. \textcopyright{} 1996 The American Physical Society.
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