Structure ‐ property relations of substituted para‐linked aromatic homopolyesters are reported. Thermotropic liquid‐crystalline substituted poly (1,4‐phenylene terephthalate)s with phase transition temperatures less than 230 °C and good solubility in common organic solvents have been synthesized. If a noncoplanar 2,2′‐disubstituted biphenylene moietyis combined with a monosubstituted phenylene moiety with sufficient bulky substituent, polyester with similar properties were obtained. Although these polyesters are soluble up to high concentrations, no lyotropic liquid‐crystalline behavior was observable.
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Hans‐Werner Schmidt (1989) studied this question.
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