1B01 側鎖にフルオロアルキル基を有するトリフェニレンディスコチック液晶の修飾基板上の配向挙動(化学・材料)

概要

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The alignment behavior of the triphenylene compounds possessing fluoroalkylated side chains was investigated for the hexagonal columnar (Col_h) mesophase by polarizing optical microscopy and the polyimide-, cetyltrimethylammonium bromide (CTAB)-, and Indium-SnO_2 (ITO) -coated glass substrates were used in this work. It was found that 2, 3, 6, 7, 10, 11-hexakis (1H, 1H, 2H, 2H, 3H, 3H-perfluoroheptyloxy)- and 2, 3, 6, 7, 10, 11-hexakis- (1H, 1H, 2H, 2H, 3H, 3H-perfluorononyloxy) -triphenylenes (F4 and F6, respectively) exhibit a spontaneous homeotropic alignment on these substrates, in contrast to the non-uniformity of spontaneous alignment of Col_h phase in the corresponding hydrocarbon mesogens. On the other hand, it was also found that 4, 4, 4-trifluorobutyloxy, 4, 4, 5, 5, 5-pentafluoropentyloxy and 4, 4, 5, 5, 6, 6, 6-heptafluorohexyloxy (F1, F2 and F3, respectively) derivatives do not show such a spontaneous homeotropic alignment on these substrates. These results indicate that the spontaneous homeotropic alignment of the Col_h phase could be easily attained by the introduction of an appropriate number and length of the fluoromethylene chains in the peripheral parts of discogens.
日本液晶学会の論文
2003-10-14