Abstract
Phase equilibria and mesophase ordering behavior of mixtures of low molar mass nematic liquid crystal (LC) and photo-cross-linked polymeric network have been investigated theoretically and experimentally. The nematic LC used was a single component, viz., 4-n-heptyl-4‘-cyanobiphenyl (K21). The polymer network was formed by photo-cross-linking multifunctional thiolene-based optical adhesive (NOA65). On the basis of a simple addition of the free energy densities of isotropic mixing and nematic ordering along with the elastic free energy density of the network, phase diagrams have been established by solving the total free energy equation self-consistently. The effects of average repeat units between cross-linked points, network functionality, and concentration dependence of network models on the phase diagrams of LC/polymer network were examined. The calculated phase diagrams displayed isotropic network + nematic solvent (I + N), isotropic network + isotropic solvent (I + I), and isotropic swollen network (I...
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