Thermotropic Copolyesters of a Series of Aromatic Diols with Phenylterephtalic Acid and 4,4'-Oxybisbenzoic Acid

GARAY, R. O. ; BHOWMIK, P. K.; LENZ, R. W.

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY

JOHN WILEY & SONS INC

Lugar: New York; Año: 1993 vol. 31 p. 1001 - 1006

0887-624X

Wholly aromatic, liquid crystalline, main chain copolyesters derived from various linearly substituted aromatic diols with mixtures of 2-phenylterephthalic acid and a nonlinear aromatic dicarboxylic acid, 4,4′-oxybisbenzoic acid, were prepared by acidolysis condensation polymerization reactions and characterized for their liquid crystalline properties. The formation of a liquid crystalline phase at elevated temperatures was not prevented by the introduction of up to 50 mol % of the nonlinear diacid in the copolymers, and all of those copolyesters exhibited nematic liquid crystalline phases. Furthermore, the inclusion of a nonlinear monomer was not as effective as was the presence of a phenyl substituent in decreasing the melting transition of these copolymers. All of the copolymers had high glass transition temperatures and high thermal stabilities.