Dielectric Relaxation and Short Range Order of a Liquid Crystalline Benzoate

Abstract

Dielectric investigations on 4‐nitrobenzyl 2,5‐bis‐(4‐n‐hexyloxybenzoyloxy)‐benzoate A (10Hz – 100MHz) and a mixture of A and rodlike benzoates B (10Hz – 100kHz) reveal for A two main relaxation mechanisms in the liquid crystalline phases. The low frequency one connected with the reorientation around the short molecular axis shows in mixtures an anormal increase of the intensity with temperature. The unexpected behaviour of the static dielectric constants of A as well as the systematic change of the dielectric data in the mixture with B are interpreted by a systematic change of the antiparallel correlation of A in the short range.

Nematic Liquid Crystals: Physical Properties, Section 2.2

“…Static and quasistatic dielectric constants of a laterally branched molecule with a 'of rod-like molecules[137, 1381. By fitting the molecular shapes to each other the antiparallel correlation can easily be changed in a statistical one in a binary system (Sec.…”