| 초록 |
Polyimide film containing cinnamate groups was investigated for photo-alignment of liquid crystal (LC) by irradiation of linearly polarized ultraviolet lights. We study the effects of the methoxy cinnamate groups on photo-alignment of LC. The anisotropy of the polyimide film induced by irradiation of linearly polarized UV light. 4-Methoxy cinnamic acid, 2-methoxy cinnamic acid and 2,5-dimethoxy cinnamic acid were irradiated and the absorption spectra were obtained with irradiation time in solubilized in chloroform to understand the effect of the structural difference in photo-reactivity. 4-Methoxy cinnamic acid and 2-methoxy cinnamic acid have different isosbestic points 268 and 250nm, respectively and 2,5-dimethoxy cinnamic acid has no isosbestic point. LCD device was fabricated and UV-visible spectroscopy was used to confirm direction of alignment. |
