Ester Liquid Crystal Mixtures for Dynamic Scattering at Elevated Temperatures.
HUGHES RESEARCH LABS MALIBU CA
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Studies are made on the effect of elevated 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 to 81C structural effects are evaluated by using different combinations of components from eight classes of esters, including phenyl benzoates, phenyl thiobenzoates, phenyl cyclohexanecarboxylates, phenyl acloxybenzoates, as well as a phenyl benzoyloxybenzoate and a phenyl biphenylcarboxylate structure. The mixtures are characterized at 25C, and their viscosity, dielectric anisotropy, conductivity anisotropy, and dc-activated DS effects are studied as a function of temperature. Thermal instabilities are studied at 100C, with and without redox conductivity dopants. The DS stability with 20 V dc is studied at 55C for three of the more stable mixtures, both in transparent cells and in cells with reflective metal electrodes. Author
- Organic Chemistry
- Physical Chemistry