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High Birefringence Liquid Crystals
Institute of Chemistry, Military University of Technology, Warsaw 00-908, Poland
* Author to whom correspondence should be addressed.
Received: 28 June 2013; in revised form: 27 July 2013 / Accepted: 31 July 2013 / Published: 3 September 2013
Abstract: Liquid crystals, compounds and mixtures with positive dielectric anisotropies are reviewed. The mesogenic properties and physical chemical properties (viscosity, birefringence, refractive indices, dielectric anisotropy and elastic constants) of compounds being cyano, fluoro, isothiocyanato derivatives of biphenyl, terphenyl, quaterphenyl, tolane, phenyl tolane, phenyl ethynyl tolane, and biphenyl tolane are compared. The question of how to obtain liquid crystal with a broad range of nematic phases is discussed in detail. Influence of lateral substituent of different kinds of mesogenic and physicochemical properties is presented (demonstrated). Examples of mixtures with birefringence ∆n in the range of 0.2–0.5 are given.
Keywords: liquid crystal; cyanide; fluoride; isothiocyanate; biphenyl; tolane; terphenyl; quaterphenyl; high birefringence; positive dielectric anisotropy
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Dąbrowski, R.; Kula, P.; Herman, J. High Birefringence Liquid Crystals. Crystals 2013, 3, 443-482.
Dąbrowski R, Kula P, Herman J. High Birefringence Liquid Crystals. Crystals. 2013; 3(3):443-482.
Dąbrowski, Roman; Kula, Przemysław; Herman, Jakub. 2013. "High Birefringence Liquid Crystals." Crystals 3, no. 3: 443-482.