Abstract
Structural properties of Polymer Dispersed Liquid Crystals made of mixtures of deuteriated polystyrene (dPS) and 4-cyano-4′-n-octylbiphenyl (8CB) are studied by Small Angle Neutron Scattering (SANS). Two distinct blends are considered with a polymer dPS molar mass Mu equal to 49500g/mol and liquid crystal concentration 60 and 75 weight% (wt.-%). Data covering the range of temperature from 30°C to 75°C are discussed. In this temperature domain, 8CB exhibits a variety of orderings such as smectic-A (21.5°C–33.5°C), nematic (33.5°C–40.5°C) or simply an isotropic state above 40.5°C. The results are rationalized in terms of the Random Phase Approximation (RPA) invoking the temperature dependence of the Flory-Huggins interaction parameter and the correlation length of fluctuations at the interface of polymer and liquid crystal.
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