Photo-optical properties and photo-orientation phenomena in an immiscible blend of cholesteric copolymer with azobenzene-containing polymer

Author： Bobrovsky Alexey Shibaev Valery

Publisher： Taylor & Francis Ltd

ISSN： 0267-8292

Source： Liquid Crystals, Vol.34, Iss.4, 2007-04, pp. : 411-419

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Abstract

Novel side chain liquid crystalline polymer blends containing immiscible non-chiral and cholesteric polymers were prepared. A non-chiral polymer was used containing azobenzene side groups capable of E-Z photoisomerization. Phase behaviour and miscibility properties of the blends were studied. Thin films of the blends were prepared by spin-coating; it was shown that just after preparation these films are optically isotropic and homogeneous. Photo- and chiro-optical properties of the films as well as photo-orientation phenomena induced by the action of polarized light were investigated. It was found that the photo-optical behavior of these films is rather complicated and considerably different from the properties of both individual components. This difference is associated with the strong influence of blend morphology on the photo-optical properties.