Preliminary communication Thermotropic liquid crystals in main chain polyesters having a mesogenic 4,4-biphenyldicarboxylate unit. 9. Chain folding in solid polyesters crystallized from smectic A

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Abstract
The lamellar structure with chain foldings is formed from the main chain polyesters crystallized from the SmA phase. The lamellar spacing increases with a decrease in crystallization temperature. This trend is contrary to that observed in conventional polymers, and is explainable if the chain foldings exist at a thermodynamic equilibrium as an entropy effect in the preceding SmA phase.

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