Abstract
Highly oriented fibres of copolymers of polyethyleneterephthalate with oxybenzoic acid, containing 60 to 80% of the latter, were studied by X-ray methods. The fibres were prepared by extrusion from a liquid-crystalline melt at various temperatures. It was shown that the partially crystalline structure of the studied fibres is characterized by longitudinal dimensions of crystalline domains on the order of several hundred Å, while the lateral packing of macromolecules only exhibits short distance order extending to 10–30 Å. An increased content of oxybenzoic acid units leads to improved ordering in the system. It was shown that the degree of orientational order in the fibres is very high, and the macromolecular orientation function attains values of 0·93–0·99.
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