Abstract
Previous work has shown that poly( p-oxybenzoate- co- p-phenylene isophthalate)s are nematogenic within the composition range 33 67 to 75 25 . X-ray investigations of oriented fibres showed that, with respect to the physical structure, they differ from the corresponding unoriented materials. The main emphasis has been placed on structural characterization of fibres from 50 50 and 67 33 copolymers, which have a broad nematic temperature range. The fibres spun from the nematic mesophase were highly oriented but crystalline order was absent. Annealing at temperatures ranging from 240 to 300°C causes crystallization. The structure of annealed fibres can be regarded as a mosaic of thin crystalline regions containing p-phenylene isophthalate sequences, together with paracrystalline regions.
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