Abstract
Cooperative reorientation of rodlike groups in amorphous composite films consisting of photo-crosslinkable polymer liquid crystal (PLC) and non-liquid crystalline (non-LC) monomer comprising a rodlike biphenyl group was investigated by irradiation with linearly polarized ultraviolet (LPUV) light and subsequent annealing. Absorption measurements revealed that biphenyl groups of both non-LC monomer and mesogenic side groups of the PLC reorient thermally, along the photo-crosslinked mesogenic groups in the PLC. The reoriented composite film is transparent and the induced birefringence is 0.105. Achieving a three-dimensional reorientation of the rodlike groups is feasible by means of slantwise LPUV light exposure.
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