| 초록 |
Recently, we reported a liquid crystal alignment material based on polyimide having cinnamate side chain, which showed extraordinary photosensitivity. As a continuing research, a series of new photosensitive polyimide structure was designed and synthesized to enable pretilt angle control. In these polymers, long alkoxy tail with different chain length was introduced at the end of cinnamate side chain. The photoalignment films result in much higher pretilt angles with homogeneous liquid crystal alignment as well as high photosensitivity. Dependence of pretilt angles was investigated with respect to the cinnamate contents and alkoxy chain length. The effect of mixed alkoxy chain length will also be discussed. |
