Effects of Polymer Doping on Phase Stability of Liquid Crystal

概要

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Polymer stabilization (PS), in which mesogenic monomers doped in a liquid crystal (LC) medium are photocured by UV light, is an attractive technique because the physical property of LCs can be improved and furthermore new characteristics may arise. In this study, we have investigated the effects of polymer doping on the phase stability of LC, i.e., whether PS can expand the temperature region in which a LC phase appears. The clearing point decreases even in PS-LCs photocured at the nematic (N) or smectic (Sm) phase temperature. Therefore, it is found that the stabilization of the usual isotropic liquid phase is due to the disordering of the molecular orientation by polymer main-chain networks. Since the phase diagrams are not different between the PS-LCs photocured at the N and SmA phases, it is found that the polymer may not stabilize the Sm layer structure. Moreover, it is found that the SmA phase can be stabilized even in the PS-LC photocured at the N phase.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2007-10-30