Dielectric anisotropy is one of the important physical parameters of liquid crystal materials for display device. Positive dielectric anisotropy is an inevitable requisite for the materials for the TN mode. The dielectric properties are arised from the dipole moment of polar functional groups within the molecules. Therefore, a lot of liquid crystals having a terminal polar group such as a cyano group or a nitro one have been extensively developed.1 It has been well known ...
