Abstract
The polymer network liquid crystal based on the liquid crystal mixture H37 and polymethylvinilpirydine is developed. Kinetics of network formation is investigated by methods of polarization microscopy and integrated small-angle scattering. It is shown that gel-like state of the composite is formed at polymer concentration above 7%. At slow cooling, the system separates into a liquid crystal-rich phase and a liquid crystal-poor phase. At this case, transition of these phases to an anisotropic state occurs at 49°C and и 41°C, accordingly, while pure H37 go over a liquid crystalline state at 61°C.The basic electro-optic parameters of the obtained composite are determined at room temperature. It is shown that threshold voltages increase and, accordingly, there is a shift of voltage dependence of rise time to the high voltage region. The contrast ratio worsens while decay time improves in comparison with the pure liquid crystal at all applied voltage. Experimental results are explained by phase separation of the system, diminution of a working area of electro-optical effects and influence of areas with the high polymer concentration on areas with their low concentration.
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