Various azobenzene derivatives and polymers were attempted as materials for thin composite films containing a polymer, a liquid crystal, and lithium perchlorate which can undergo ionic‐conductivity switching induced by light or heat. Poly(vinyl chloride) ‐based composite films containing enantiotropic azobenzene liquid crystals 1, exhibited significant ionicconductivity change based on thermo‐ and photoinduced phase transitions of 1, the temperature dependence on the ionic conductivity reflecting the enantiotropic phase transition behavior of the liquid crystals. Marked, reversible ionic‐conductivity switching on alternating irradiation of UV and visible lights was attained with the composite films containing 1, especially 1 (n = 12). Incorporation of monotropic liquid crystals 3 to the composite films allowed bistability in the temperature dependence on the ionic conductivity. Employment of a polycarbonate resin and poly(methyl methacrylate) as the polymer material of the composite films gave similar ionic‐conductivity changes to the poly(vinyl chloride) composite films, whereas polyethyleneoxide brought about some different results in the photoinduced ionic‐conductivity change.
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Kimura et al. (1991) studied this question.
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