Photo-optical properties of photopolymerizable cholesteric compositions |
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Authors: | Natalia Dadivanyan Alexey Bobrovsky Valery Shibaev |
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Institution: | (1) Department of Chemistry, Moscow State University, Lenin Hills, Moscow, 119992, Russia |
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Abstract: | Compositions consisting of nematogenic diacrylate monomer and chiral dopants capable of forming the cholesteric mesophase
and of photopolymerizing were obtained and studied. For the first time, the change of optical properties and cholesteric helix
pitch during photocrosslinking of diacrylate under UV irradiation (365 nm) was investigated. The kinetics of photopolymerization
was studied and several stages of this process were observed. Cholesteric photopolymerizable blends containing chiral photosensitive
dopant capable of E–Z isomerizing under UV irradiation (313 nm) were studied. The decrease of the helix twisting power of
the dopant during photoisomerization was observed resulting in untwisting of the helix and shift of the selective light reflection
peak into the long-wavelength region of the spectrum. The possibility of the photoregulation of optical properties of such
blends with following fixation of structure and of these properties by means of photopolymerization under UV irradiation (365 nm)
was demonstrated. |
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Keywords: | Cholesteric photopolymerizing mixtures Chiral-photochromic dopant E– Z isomerization Selective light reflection peak photoregulation |
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