Light Switching Effects of Polymer/(Liquid Crystal) Composite Systems

  • T. Kajiyama
  • H. Kikuchi
  • J. C. Hwang
  • S. Moritomi
  • Y. Morimura

Abstract

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).

Keywords

Anisotropy Rubber Polystyrene Calorimetry Methacrylate 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • T. Kajiyama
    • 1
  • H. Kikuchi
    • 1
  • J. C. Hwang
    • 1
  • S. Moritomi
    • 1
  • Y. Morimura
    • 1
  1. 1.Department of Applied ChemistryKyushu UniversityHigashi-ku, Fukuoka 812Japan

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