2A13 ベント型液晶分子のスメクチック相における構造とモレキュラーキラリティー

概要

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Layer structure and clectrooptical switching were studied in a bent-shaped liquid crystal motecule, P-12-PIMB. By the application of a de field during slow cooling from the isotropic to the highest temperature smectic phase, B2, large uniform domains were obtained. In the B2 phase, antiferroelectric structure was confirmed, and the molecular tilt angle was found to be 34°by the texture observation. In addition, domains with a smaller apparent tilt angle were also obtained. Basically, tilt directions with respect to the smectic layer normal are equivalent, since the molecules do not have any chiral carbons. Actually, two types of the homogeneously chiral domains were proposed by Link et al [1]. Moreover, all of the molecules in a certain layer tilt to a certain direction. Therefore, the existence of the domains with smaller tilt angle suggests that the layers with opposite senses of chirality are mixed in the domain, and that the molecules are possibly aligned like the orientation of the ferrielectric subphases of antiferroelectric liquid crystals.
日本液晶学会の論文
1999-09-28