A novel photo-crosslinkable polymer liquid crystal (PCP-LC), in which a high molecular orientation has been achieved by irradiation with UV light and thermal treatment, is presented. Two types of optical birefringent film have been obtained whereby the orientational order is controlled by the irradiation angle and polarization of the UV light. The Figure shows the viewing angle dependence of the two films between crossed polarizers.
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Kawatsuki et al. (2001) studied this question.