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Thermotropic liquid crystals of main-chain polyesters having a mesogenic 4,4 -biphenyldicarboxylate unit. 8. X-ray analyses of structural change on S A to S C transition
We have prepared main-chain liquid crystalline copolyesters made from biphenyldicarboxylic acid as a mesogenic component and a certain mixture of 2-methylbutanediol and hexanediol as spacer components. These copolymers exhibit the novel polymorphism with the smectic A as a higher temperature mesophase and the smectic C phase as a lower temperature one. The transition behavior of smectic A to smectic C has been examined by X-ray diffraction method and the layered structure of smectic C phase has been described by a comparison with the preceding smectic A structure.