Abstract
This paper describes thermally enhanced in-plane and out-of-plane reorientation of mesogenic groups in copolymer liquid-crystal (CPLC) films that have a photo-cross-linkable 4-(4'6methoxycinnamoyl)biphenyl (MCB) side group and a 4-methoxybiphenyl (4MB) side group. The side groups are cross-linked 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. When the composition of the 4MB comonomer is less than 45 mol-%, thermal treatment in the liquid-crystalline temperature range causes in-plane reorientation of the film and results in an in-plane order parameter of 0.71. In contrast, when the composition of the 4MB is increased, out-of-plane reorientation is generated. Three-dimensional molecular reorientation and inclined out-of-plane reorientation are achieved by adjusting the exposure angle.
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