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Photo-optical properties of photopolymerizable cholesteric compositions

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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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Acknowledgments

This research was supported by the Russian Foundation of Fundamental Research (05-03-33193) and Federal Scientific Technical Program (contract no. 02.434.11.2025). A.B. gratefully acknowledges the Russian Science Support Foundation, the research fellowships provided by INTAS (reference no. 03-55-956).

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Authors and Affiliations

  1. Department of Chemistry, Moscow State University, Lenin Hills, Moscow, 119992, Russia

    Natalia Dadivanyan, Alexey Bobrovsky & Valery Shibaev

Authors
  1. Natalia Dadivanyan
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  2. Alexey Bobrovsky
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  3. Valery Shibaev
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Correspondence to Alexey Bobrovsky.

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Dadivanyan, N., Bobrovsky, A. & Shibaev, V. Photo-optical properties of photopolymerizable cholesteric compositions. Colloid Polym Sci 285, 681–686 (2007). https://doi.org/10.1007/s00396-006-1593-5

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  • DOI: https://doi.org/10.1007/s00396-006-1593-5

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