6533b7d6fe1ef96bd12659aa

RESEARCH PRODUCT

Sanidics: A new class of mesophases, displayed by highly substituted rigid-rod polyesters and polyamides

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Abstract The structure of rigid-chain polyesters and polyamides which possess flexible side chains consisting of methylene or 1,4,7-trioxaoctyl oxide units have been investigated by means of X-ray scattering. The X-ray studies were performed on fibres and monodomains. Additional information was gained from calorimetric, dilatometric and microscopic studies. The investigations revealed that these polymers display mesophases and that the structures of the mesophases differ from those observed for discotic and calamitic phases. They are characterized by the fact that in the ordered and disordered phases board-like molecules are stacked parallel on top of each other and that these stacks of molecules are oriented parallel to each other. In the least ordered phase the molecules are only oriented parallel to each other. The various modifications of the mesophases observed so far differ with respect to each other in terms of the order within the stacks as well as in terms of the spatial arrangements of the stack...