3C08 ポリビニルシンナメートによる液晶分子の光配向機構の界面和周波発生法に基づく解析

概要

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Photoreaction process at the top-surface of poly(vinyl-cinnamate)(PVCi) and the molecular alignment of 4-cyano-4'-pentylbiphenyl (5CB) at the photoreacted PVCi were investigated by the interface enhanced sum-frequency generation method. It was revealed that the two photoreaction processes of photoisomefization and photodimerization occurred simultaneously by UV irradiation at the PVCi surface. The fraction of the C=C group of the PVCi at the surface decreased rapidly with UV irradiation, even if it still remained in the bulk. The resuks suggest that the photodimerization is a dominant photoreaction at the PVCi film surface rather than the photoisomerization, and the photodimerization process shows a good agreement with the development of the orientational anisotropy of 5CB contacting with the UV exposed PVCi film. It is concluded that the anisotropic photodimerizafion of PVCi is a dominant mechanism for the photoalignment of 5CB.
2001-09-24