1B12 側鎖にフルオロアルキル基を持つトリフェニレンの修飾基板上の配向挙動(化学・材料)

概要

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The orientational behavior of hexagonal columnar (Col_h) mesophase for the triphenylene compounds having fluoroalkylated side chains was investigated on the polyimide-, cetyltrimethylammonium bromide (CTAB) - and Indium-SnO_2 (ITO) - coated glass substrates by polarizing optical microscopy. It was found that 2, 3, 6, 7, 10, 11-hexakis (1H, 1H, 2H, 2H, 3H, 3H-perfluoroheptyloxy) triphenylene (F4) exhibits a spontaneous homeotropic alignment on all substrates, while the corresponding hydrocarbon mesogen does not. In Col_p mesophase of the non-fluorinated butyloxy derivative (C1) tends to show a planar alignment on all these substrates, while 4, 4, 4-trifluorobutyloxy derivative (F1) shows neither a homeotropic nor a planar alignment in Col_h, phase. These indicate that the homeotropic alignment of Col_h, phase for triphenylene mesogens could be easily attained by the introduction of an appropriate length of the fluoromethylene group into the peripheral chains.
日本液晶学会の論文
2002-10-09