The anisotropic photoreaction of a liquid-crystalline (LC( copolymer comprising one co-monomer being anisotropically photo-crosslinkable by linearly polarized (LP( -UV light and the other being insensitive to UV-irradiation is presented. Polarized UV and IR studies suggested a photo-induced alignment of the mesogenic side groups during the LP-UV photoreaction at the LC temperature range of the copolymer. The direction of the aligned mesogenic groups is parallel to the electric vector of the incident LP-UV light and the induced birefringence is 0.07.
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Kawatsuki et al. (1998) studied this question.