Formulation of a binary eutectic antiferroelectric liquid crystal mixture: Comparison of dielectric and electro-optic properties with the pure compounds

摘要

AbstractTwo antiferroelectric liquid crystals [C3F7·CH2O·C6H12·O·Ph·COO·Ph·Ph·COO·CH*(CH3)C6H13] and [C3F7·CH2O·C6H12·O·Ph(F2)·COO·Ph·Ph·COO·CH*(CH3)C6H13] are mixed in varying wt% to investigate the change of melting point, phase sequence and other properties. The eutectic mixture is obtained at 50wt% of each. It shows the same phase sequence as that of pure compounds (Cr–SmCA*–SmC*–SmA*–Iso) but with increased range of SmCA* phase which supercools till ?8°C. The critical frequencies of all the collective relaxation modes (PL, PH, GM and SM) lie in between those of the pure compounds. PLand SM critical frequencies are not proportional to the concentration of pure compounds but for PHand GM they are almost proportional. The critical field for suppression of the PLmode is increased significantly in the mixture. The GM dielectric increment of the eutectic mixture decreases substantially in comparison to pure compounds. Hereditary mode is observed to penetrate almost 5.0°C inside the SmC