Materials Chemistry and Physics, Vol.171, 33-38, 2016
Highly tilted liquid crystalline materials possessing a direct phase transition from antiferroelectric to isotropic phase
Pure compounds and multicomponent mixtures with a broad temperature range of high tilted liquid crystalline antiferroelectric phase and a direct phase transition from antiferroelectric to isotropic phase, were obtained. X-ray diffraction analysis confirms these kinds of materials form a high tilted anticlinic phase, with a fixed layer spacing and very weak dependency upon temperature, after the transition from the isotropic phase. Due to this, not only pure orthoconic antiferroelectric liquid crystals but also those with a moderate tilt should generate a good dark state. Furthermore, due to the increased potential for forming anticlinic forces, such materials could minimize a commonly observed asymmetry of a rise and fall switching times at a surface stabilized geometry. (C) 2016 Elsevier B.V. All rights reserved.
Keywords:Liquid crystals;Chemical synthesis;Differential scanning calorimetry (DSC);X-ray scattering;Optical properties;Thermodynamic properties