| 초록 |
In order to solve the drawbacks of polyimide rubbing method, recent researches on a photo-alignment method have intensively been conducted. [2+2]cycloaddition materials with photoreactive cinnamate and chalcone groups have excellent photosensitivity and orientation stability and thus are expected to be good candidates for the practical use. In this study, three different photoreactive compounds containing chalcone or cinnamate group were synthesized and their physical properties were evaluated as additives for photo-alignment layer. Their structures were confirmed by FT-IR and NMR spectroscopy, and photosensitivities were evaluated by UV-VIS spectroscopy. the retardation film was prepared by adding the additive to a commercially available photo-alignment polymer and the orientation stabilities were measured. Consequently, the retardation film to which the additives were added showed enhanced photo-alignment properties, indicating the advantage of the use of additive. |
