The properties of liquid-crystalline copolyesters prepared from dihydroxybenzophenone (DHBF), resorcinol and isophthalic acid have been characterized by DSC, X-ray scattering, light microscopy, and low-angle light scattering. It has been found that polymers containing at least 40 mole-% of DHBF exhibit liquid-crystalline properties, whereas addition of resorcinol (to 60 mole-%) results in lowering of the temperature of mesophase transitions to a range making processing feasible. By the DSC-method, the presence of multiple melting peaks has been revealed what probably confirms the polymorphism of the systems under study. It has been found by the optical methods that the mesophase of these polymers has a spherolitic or fine-crystalline structure.
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