Dielectric Relaxations and Intermolecular Interaction in Several Binary Nematic Mixtures of P-methoxybenzylidene - P'-n-butylaniline and Non-mesogenic Compound

Anisotropic dielectric relaxations in several binary nematic mixtures of MBBA and non-mesogenic compound oriented by magnetic field were measured in the frequency range of 300 Hz to 3 MHz. Viscosity measurements were also made in the isotropic state. Non-mesogenic compounds used were non-linear shaped molecules such as chloroform, m-xylene, and 1,3,5-trimethylbenzene, and nearly linear shaped molecules such as p-n-butylaniline, p-xylene, and azobenzene. ~y using the Meier-Saupe theory, it is concluded that the linear shaped molecules strengthen a long range intermolecular interaction in the nematic mixtures, and the non-linear shaped molecules do not affect both a long range and a short range intermolecular interaction.