Thermotropic liquid crystalline polyamides from polyethyleneglycol bis(4‐carboxyphenyl)ethers

Abstract

AbstractNew thermotropic liquid crystalline polyamides were prepared from polyethyleneglycol bis(4‐carboxyphenyl)ether (PEGn, n = 2, 3, 4) and aromatic diamines by using triphenyl phosphite in pyridine as the condensing agent. Substituted p‐phenylenediamines and 4,4′‐diaminobiphenyls were successfully used; melting points and isotropization temperatures of the polyamides were changed by the kind and number of the substituents. Copolymerization of long chain aliphatic dicarboxylic acids was carried out at the lower melting point of the copolymer. Kink monomers were also incorporated into the polymer backbone. © 1993 John Wiley & Sons, Inc.