A Novel Generation of Photoactive Comb-Shaped Polyamides for the Photoalignment of Liquid Crystalsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 24 октября 2013 г.
Аннотация:A new approach to the synthesis of photoactive
comb-shaped homo- and copolyamides containing azobenzene,
cinnamate, and coumarin side groups for photoalignment
of liquid crystals was elaborated. Photooptical properties
and photoorientational ability of these polymers with respect
to liquid crystals were studied. It was shown that polarized UV
irradiation of all spin-coated polyamides leads to orientation of
liquid crystalline molecules deposited on the polyamide thin
films. The synthesized polymers containing cinnamate and
coumarin side groups as well as azobenzene-containing cyanoand
nitro-substituted polymers demonstrated good orientation
ability in relation to liquid crystals displaying photoinduced
planar orientation with high dichroism values within the range
of 0.68–0.72. Contrary to the above-mentioned polyamides,
azobenzene-containing fluorosubstituted polymers induced a
homeotropic orientation of liquid crystals. It was shown that
the synthesized photoactive polyamides can be considered as
promising photoalignment materials for application in display
technology, photonics, and other “smart” optical devices.