30 April 2003 Photocrosslinked film of polymers having chalconyl moiety and their alignment capability for liquid crystal materials
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We synthesized two side chain polymethacrylate derivatives polymers 1 and 2 side chain polymer 3 and 4 and main chain polyimide polymer 5 derivatives containing a chalconyl moiety to investigate the extent of photoreaction and photoalignment behavior of liquid crystalline (LC) molecules. A smectic A phase was exhibited for the polymethacrylate derivatives, while polyimide derivatives did not show any mesophases. Only a glass transition was observed for the polyimides. The LC phase of polymethacrylate derivatives showed a good value of the extent of photoreaction, while the extent of photoreaction for polyimides above glass transition temperature was also larger than that below glass transition temperature. Mixtures of low molar mass liquid crystal (MBBA or 5CB) and dichroic dye were filled in the LC cell fabricated from the polymer. In the case of the LC cells fabricated from polymer 1 film irradiated with linearly polarized UV (LPUV) light in the LC phase, the dichroic ratio (DR) values were positive showing parallel orientation of the LC molecule to the electric vector of the incident LPUV light. The DR values were also positive for the LC cells fabricated from the polymers 3 and 4 film irradiated with LPUV light, while the negative DR values were obtained for the polymer 5 film.
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Naoyuki Koide, Naoyuki Koide, Takashi Mihara, Takashi Mihara, } "Photocrosslinked film of polymers having chalconyl moiety and their alignment capability for liquid crystal materials", Proc. SPIE 5003, Liquid Crystal Materials, Devices, and Applications IX, (30 April 2003); doi: 10.1117/12.473850; https://doi.org/10.1117/12.473850

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