Light Switching Effects of Polymer/(Liquid Crystal) Composite Systems
Aggregation states and electro-optical effects based on light scattering have been investigated for polymer/(liquid crystal) composite films. A continuous liquid crystalline domain is embedded in a three-dimensional spongy polymer matrix. The composite film composed of poly(methyl methacrylate)(PMMA) and nematic liquid crystal (LC) with positive dielectric anisotropy exhibited reversible (light scattering)—(light transmission) switching upon off- and on-a.c. electric fields, respectively. A light scattering state was dependent on optical heterogeneities such as a spatial distortion of nematic directors and/or mismatching in refractive indices of the components. Reversible and bistable electro-optical effects were also recognized for a smectic phase of a binary composite system composed of liquid crystalline polymer (LCP) and nematic LC. In the case of a smectic mesophase, turbid and transparent states remained unchanged as it was, even though after turning off an electric field (memory effect).
KeywordsLiquid Crystal Composite Film Composite System Liquid Crystalline Polymer Liquid Crystal Phase
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