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Liquid Crystals and their Application
Russian Journal Zhidkie kristally i ikh prakticheskoe ispol'zovanie Жидкие кристаллы и их практическое использование |
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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2009, 3, 28—35. |
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Structural Changes in Liquid Crystals Capsulated by Acrilic Copolymer in an External Electrical Field
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I. A. Kazantseva1, S. A. Bulgakov2, M. M. Johns1, E. V. Stepanov1
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Author affiliations
1Lobachevsky State University of Nizhni Novgorod,
23 Gagarin Avenue, Nizhny Novgorod, 603950, Russia
E-mail: kazantseva@phys.unn
2Research Institute for Chemistry of Lobachevsky State University of Nizhni Novgorod,
23 Gagarin Avenue, Nizhny Novgorod, 603950, Russia
E-mail: sbulg@ichem.unn.ru
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Abstract
"The blooming effect" of the polymer-dispersed liquid crystal films after the applica-tion of an external electric field was found. The effect is expressed in the difference in trans-mission between two opaque states ΔToff = Toff – T'off (Toff is the transmission in the initial opaque state, T'off is the transmission after the electric field has been switched off). The increase of liquid crystal drop sizes from submicron 0,7 ÷ 0,9 μm up to 1,4 ÷ 1,6 μm was found. The structural film changes uninder an external electric field were investigated. It was also found that the addition of 5 vol. % potassium acetate partially depress the blooming effect.
Keywords: liquid crystal, photopolymerization, ethylhexyl acrylate, acrylic acid, polymer-dispersed liquid crystal films, electro-optical properties
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