Alignment of Photoreactive Polymer Liquid Crystals by Ultra Violet Light

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We investigated photorientation of polymer liquid crystal films and alignment control of liquid crystal (LC) on photo-cross-linkable polymer films using a slantwise nonpolarized ultraviolet (NP-UV) light irradiation. A polymer having several kinds of photoreactive mesogenic groups, such as 6-[4-(4'-methoxycinnamoyloxy) biphenyloxy] hexyl side-group, anthracene-containing side group or coumarin containing side groups. In addition, copolymers with methacrylate derivatives comprising photoinactive side-groups were also synthesized and used for the experiments. We clarified that the mesogenic side groups could align by the use of non polarized UV light as well as the sue of polarized UV light. Further, the LC aligned homogeneously or homeotropically with tilt angles, and the alignment behavior was dependent on the type of the (co) polymers and LCs.