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).
KeywordsAnisotropy Rubber Polystyrene Calorimetry Methacrylate
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