Abstract
An investigation has been made into the structural changes in poly(ethylene terephthalate) fibres brought about by drawing in a texturing machine. Evidence from both wide-angle and small-angle X-ray scattering is presented. The main feature of the small-angle X-ray scattering is a transition from two, meridional diffraction peaks to a symmetrical, four-point pattern as the draw ratio is increased. Optical transform methods have been used to investigate possible structural changes which could produce the observed transition. A tentative structure for poly(ethylene terephthalate) fibres is proposed.
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