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Thermally Stable Photo‐Crosslinking Polymers Bearing Cinnamate Groups for Liquid Crystal Alignment
Author(s) -
Sung Oh Hyun,
Cho Seung Hyun,
Kim Whan Gun,
Song Ki Gook,
Paek Sang Hyon,
Lee Jun Young
Publication year - 2007
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200750305
Subject(s) - materials science , polymer , absorbance , liquid crystal , irradiation , anisotropy , polymer chemistry , photochemistry , optics , composite material , optoelectronics , chemistry , physics , nuclear physics
Optically ansiotropic photo‐crosslinking polymers were synthesized through reaction between different kinds of epoxy resins and cinnamic acids. Optical anisotropy of the polymer film exposed to linearly polarized UV light (LPUVL) was confirmed from the polarized UV‐Visible spectra. The polymer films irradiated by LPUVL showed anisotropic absorbance in the polarized UV‐Visible spectra, while the polymer irradiated by unpolarized UV exhibited isotropic absorbance. It was also confirmed that the polymer film exposed to LPUVL could align liquid crystals (LC). LC cell fabricated using the polymer films irradiated by LPUVL showed the anisotropic polar diagram, implying that the polymer films may be applied as the photoalignment layer for LC display.