Abstract
Three kinds of methacrylate polymer liquid crystals (PLCs); a copolymer PLC (CPLC) substituted with a photo-cross-Linkable 4-(4′-methoxycinnamoyl)oxybiphenyl (MCB) side group and a 4-methoxybiphenyl (4MB) side group (P1), a CPLC with a MCB side group and a 4-cyanobiphenyl (4CN) side group (P2), and a PLC with a photo-cross-linkable 4-cinnamoyloxybiphenyl side group (P3), are synthesized. The thin films of these polymers are applied to a birefringent film by irradiation with linearly polarized ultraviolet (LPUV) light and subsequent annealing. Due to axis-selective photo-cross-linking, a small negative optical anisotropy is observed for all CPLCs after exposure to LPUV light. Thermal treatment in the liquid crystalline temperature range for P1 causes in-plane reorientation and results in an in-plane order parameter of 0.71. In contrast, out-of-plane reorientation is generated for P2 and P3. Three-dimensional molecular reorientation and inclined out-of-plane reorientation can be controlled by adjusting the exposure angle. The inclination direction is dependent on the type of the liquid crystalline phase and the side group.
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