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Abstract
AbstractA series of fully aromatic, thermotropic homopolyesters, derived from 3,4′‐benzophenone dicarboxylic acid and various aromatic diols, was prepared by the melt polycondensation method and examined for thermotropic behavior by a variety of experimental techniques. The aromatic diols used in the study were hydroquinone, 2,6‐, 1,4‐, 1,5‐, 2,3‐, and 2,7‐naphthalenediol isomers. All of the homopolyesters of 3,4′‐benzophenone dicarboxylic acid with aromatic diols (except that with 2,7‐naphthalenediol) formed a nematic LC phase in the melt. They had the glass transition temperatures (Tg) in the range of 133–164°C, the melting transitions (Tm) in the range 305–360°C and the high thermal stabilities (Td) in the range of 410–483°C. The 2,6‐naphthalenediol based homopolymer had the highest Tm (360°C) and the 2,3‐naphthalenediol based homopolymer had the lowest Tm (305°C) among all of the homopolymers of naphthalenediol isomers. © 1994 John Wiley & Sons, Inc.
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