主催: 応用物理学会, 高分子学会, 日本化学会 液晶討論会世話人会
会議名: 第23回 液晶討論会
回次: 23
開催地: 東京工業大学
開催日: 1997/09/25 - 1997/09/27
Formation of photoinduced diffraction grating within a thin film of a liquid-crystalline polysiloxane with azobenzene in the side chain was investigated. This polymer exhibited a smtectic C phase between 81 and 87℃, and a nematic phase between 87 and 109℃. Moreover, this polymer formed two kinds of solid state at room temperature: an amorphous state and a crystalline state. The crystalline-state sample was prepared by annealing after heating to the mesophase temperature, and the amorphous-state sample was obtained without heat treatment. The alignment of the mesogenic chromophores in the amorphous state is random, while the they form an interdigitated alignment in the crystalline state. The diffraction light was observed in both states by irradiation of two coherent beams. The diffraction efficiency in the crystalline state was smaller than that in the amorphous state. The diffraction efficiency and the rate of formation of the diffraction grating depend on the alignment of the mesogenic chromophores.