Abstract
Cloud point measurements and calorimetric properties were considered for binary systems of polystyrene/4cyano-4′-n-octylbiphenyl (8CB), and deuterated polystyrene/8CB. The experimental phase diagrams were established using polarizing optical microscopy and differential scanning calorimetry. The experiments were realized in the range of temperatures from 25 to 75°C, in which the 8CB presents a smectic A structure, a nematic and an isotropic phase. The phase behavior of both systems were analyzed using a combination of the Flory-Huggins lattice model for isotropic mixing and the Maier-Saupe-McMillan theories for anisotropic ordering. A good agreement was obtained between theoretical considerations and experimental data.
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