Features of intermolecular interactions in binary solutions of nematic p-alkanoyloxy-p '-nitroazoxybenzenes with aliphatic alcohols: II. Phase equilibria in mesogen-nonmesogen systems

The GLC data and model concepts showed that the breaking effect of C-3-C-5 alkanols on nematic structures of p-alkanoyloxy-p'-nitroazoxybenzenes (R = C3H7 C5H11, C7H15) is determined by stability of the intermolecular H-bonde d complexes mesogen-nonmesogen and by orientation of the bound mesomorphic substance. The limiting slopes of the boundaries of the phase equilibria ne matic phase-isotropic liquid correlate with the partial molar enthalpies an d entropies of solution of alcohols in the mesomorphic structures at infini te dilution.