Ester Liquid Crystal Mixtures for Dynamic Scattering at Elevated Temperatures

Publisher Website
Google Scholar
Abstract
Studies are made on the effect of eievated temperature on the properties, thermal stability, and dynamic scattering (DS) of liquid crystal, ester mixtures. Six eutectic nematic mixtures are formulated with clearpoints in the range of 72[ddot] to 81[ddot]C; structural effects are evaluated by using different combinations of components form eight classes of esters, including phenyl benzoates, phynyl thiobenzoates, phenyl cyclohexanecarboxylates, phenyl acyloxybenzoates, as well as a phenyl benzoyloxybenzoate and a phenyl biphenylcarboxylate structure. The mixtures are charactersized at 25[ddot]C, and their viscosity, dielectric anisortropy, conductivity anisotropy, and dc-activated DS effects are studied as a function of temperature. Thermal instabilities are studied at 100[ddot]C, With and without redox conductivity dopants. The DS stability with 20 V dc is studied at 55[ddot]C for three of the more stable mixtures, both in transparent cells and in cells with reflective metal electrodes.