1B11 ネマチック液晶材料の各種材料定数と混合比 (IV) : フッ素末端基の効果

概要

論文の詳細を見る
Viscoelasticity of binary liquid crystal systems were studied using a light scattering method which can be applied to the determination of the decay constant associated with the ratio of the viscosity and the elastic constant for the twist deformation. For the mixtures of 7HEF, a terminal-fluorinated liquid crystal, and BCH5 containing three aromatic rings as the core group, the phase diagram shows a wide nematic region in the temperature range of about 60 ℃ to 140 ℃ at 30 mol per cent of 7HEF. The activation energy for the viscosity was evaluated from the temperature dependence of the viscoelastic constant, showing a minimum at 60 mol per cent of 7HEF. It has also been found that the viscoelastic constant is strongly dependent on the molar fraction at a constant reduced temperature, i.e, a constant ratio of the measurement temperature and the isotropic-nematic transition temperature at each molar fraction.
日本液晶学会の論文
1995-09-10