Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 54, Issue 18, Pages 2962-2970Publisher
WILEY-BLACKWELL
DOI: 10.1002/pola.28181
Keywords
liquid-crystalline polymers (LCP); azo polymers; phase behavior; photochemistry; E-Z photoisomerization; photo-orientation
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Funding
- Russian Science Foundation [14-13-00379]
- Czech Science Foundation [16-12150S]
- Ministry of Education, Youth and Sports of the Czech Republic [LH15305]
- Russian Science Foundation [14-13-00379] Funding Source: Russian Science Foundation
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Two photosensitive chiral liquid crystalline azobenzene-containing polymethacrylates having different length of flexible spacer connecting chromophores with back-bone were synthesized and their phase behavior and photooptical properties were studied. Both polymers consist of lateral methyl substituents in ortho-position of azobenzene chromophores providing high photosensitivity even in red spectral region as well as high thermal stability of photoinduced Z-form of azobenzene chromophores. It is shown, that smectic phase (SmA*) formation in films of polymer with longer spacer pre-determines its quite unusual spectral response to UV and subsequent visible light actions. The SmA* phase promotes spontaneous homeotropic alignment of azobenzene chromophores in polymer films. UV-irradiation induces not only E-Z isomerization but also results in disruption of homeotropic alignment, whereas subsequent visible light action enables to obtain films with the low degree of chromophores orientation. The photo-orientation phenomena under the action of polarized light of different wavelength on polymer films were studied. The possibility of using red polarized light of moderate intensity for optical photorecording on polymer films is demonstrated. (C) 2016 Wiley Periodicals, Inc.
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