Liquid Crystals for Air Force Displays

摘要

Research was conducted toward the syntheses of new organic compounds with a general structure involving two benzene rings joined by a central group, usually polar, and with 4,4'-disubstitution of n-alkyl and n-alkoxyl groups or small polar-functions such as chloro, cyano-aric acyloxy-substituents. Some members of each of the compound series involving central groups including nitrones, azines, esters, and azo- were found to possess nematic liquid crystalline behavior. The azo- and ester series with n-alkyl and n-alkoys 4,4'substituents had temperature ranges just above ambient; binary mixtures of a number of these possessed nematic behavior at ambient temperatures. Several novel compound types with gross overall structures related to the 4,4' disubstituted bisubstituted bisaryl derivatives but with intramolecular ring fusion were also prepared. In general nematic vehavior in these compounds, when present, was exhibited at higher temperatures and over narrower ranges than for the open-ring analogues. (Author)