Abstract
A novel liquid-crystalline polymer (LCP) containing an azobenzene group directly connected to a tolane moiety (azotolane moiety) was synthesized. The LCP showed a nematic phase in a broad temperature range (> 200°C). Trans-cis photoisomerization and cis-trans thermal isomerization occurred even though the LCP contains a long azotolane moiety. The homogeneously aligned film of the LCP exhibited an extremely large value of Δn (0.70 at 633 nm). Upon irradiation with a pumping beam in the LC phase, a large change in Δn was induced due to destruction of the homogeneous alignment of the azotolane moieties.
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