Photoinduced molecular reorientation in photoreactive liquid crystalline copolymers in a phase retarder application

Polymethacrylate copolymers, which have hexamethylene spacer groups terminated with 4-methoxyphenyl-4′-oxycinnamate (MPC) and 4-oxybenzoic acid (BA) in the side chain, were synthesized. Thin films underwent thermally enhanced photoinduced cooperative molecular reorientation using linearly polarized...

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Bibliographic Details
Published in:Polymer (Guilford) 2011-11, Vol.52 (25), p.5788-5794
Main Authors: Kawatsuki, Nobuhiro, Shoji, Hiroshi, Yamaguchi, Kotaro, Kondo, Mizuho, Tsubaki, Kouki
Format: Article
Language:English
Subjects:
Annealing
Applied sciences
Birefringence
Copolymers
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Liquid crystalline polymer
Liquid crystals
Optical materials
Optics
Organic polymers
Photoalignment
Photoinduced orientation
Physicochemistry of polymers
Physics
Polymers and organics
Polymers with particular properties
Preparation, kinetics, thermodynamics, mechanism and catalysts
Retarders
Spacers
Thin films
Tuning
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Summary:Polymethacrylate copolymers, which have hexamethylene spacer groups terminated with 4-methoxyphenyl-4′-oxycinnamate (MPC) and 4-oxybenzoic acid (BA) in the side chain, were synthesized. Thin films underwent thermally enhanced photoinduced cooperative molecular reorientation using linearly polarized ultraviolet (LPUV) light and subsequent annealing. Moreover, low exposure energy (4–80 mJ cm −2) and annealing temperature ( 0.5). Tuning the copolymer composition adjusted the birefringence (∆ n) of homogeneously reoriented films between 0.10 and 0.22 at 517 nm. Finally, a phase retarder (∆ nd = 130 nm) using an oriented copolymer on a triacetylcellulose (TAC) film substrate, which exhibited a thermal stability up to 140 °C, was fabricated. [Display omitted]
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2011.10.013