| 초록 |
We synthesized a series of polystyrene derivatives having dual photoreactive side moieties, 4-(4-cyanophenylazo)phenoxymethyl and methyl cinnamate-4-oxymethyl groups, for the application of photoalignment materials. Stable and homogeneous planar LC cells having adjust pretilt angles from 0.5o to 5o were obtained from these polymer films having the molar contents of the azobenzene groups in the range of 0-20 mole % showed through the irradiation of linearly polarized ultraviolet (LP-UV) light to crosslink the cinnamate groups followed by the irradiation of linearly polarized visible (LP-Vis) light to induce the isomerization of azobenzene groups. The electro-optical and LC alignment properties of the LC cells were found to be affected by the molar composition of photoreactive side groups, exposure energy of LP-UV light, and exposure energy of LP-Vis light. |
