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Liquid Crystalline Properties of the Copolyesters Prepared from Resorcinol, p-Hydroxybenzoic Acid, and Terephthalic Acid

A series of aromatic copolyesters was prepared in melts from 1,3-diacetoxybenzene, terephthalic acid and p-acetoxybenzoic acid, and the copolyesters’ liquid crystalline and other properties were investigated. The compositions containing more than 65 mol% the p-oxybenzoyl (POB) unit exhibited thermotropic behavior, whereas those with less than 40 mol% the POB structure were not thermotropic. The copolyesters with an intermediate level (50–60 mol%) of POB units showed an interesting, shear flow induced formation of mesophases. The possibility of compositional heterogeneity in the copolyesters was demonstrated by collecting and characterizing insoluble fractions.