1B17 直線偏光紫外光照射されたポリイミド膜の表面異方性と方位角アンカリング強度の関係

概要

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We have measured the azimuthal anchoring strength of liquid crystal molecules in contact with poly[4,4'-oxydiphenylen-1,2,3,4-cyclobutanetetracarboxyimide] (CBDA-ODA) films. The measurement was performed for) a 10 nm-thick film exposed to linearly polarized ultraviolet light (LPUVL) of wavelength 〜250 nm at I J/cm^2 as well as for a rubbed film with the same film thickness. Tile infrared (IR) dichroic difference of the phenyl C-C stretching vibration of CBDA-ODA was almost the same for both films. However, the azimuthal anchoring strength for the LPUVI-exposed film was about 5 times smaller than that for the rubbed film. We believe that the small anchoring strength of the LPUVL-exposed film is due to the decrease of the molecular density and/or the decrease of the polyimide chain length that arise from the photo-induced decomposition. In our presentation. we will also report the relation between the IR dichroism of LPUVL-exposed films and the azimuthal anchoring strength.
日本液晶学会の論文
2000-10-23