WAXS analysis of structural changes of poly(ethylene terephalate) fibers induced by supercritical-fluid dyeing
Sfiligoj-Smole, Majda ; Zipper, P.
The supercritical CO2 fluid, a new environment-friendly dyeing medium, changes the fiber structure to a certain extent depending on the treatment temperature and pressure used. Therefore the changes ...of the crystalline structure in poly(ethylene terephtalate) (PET) as brought about under the influence of the supercritical CO2 fluid were investigated. For the data collection of wide-angle X-ray diffraction full patterns a two circle goniometer, equipped with a position sensitive detector, was used. From the observed two-dimensional fiber diffraction patterns the crystallinities of various treated fibres were evaluated. The equatorial scanning yielded the dimensions crystallities. To elucidate the fiber surface morphology changes SEM analyses were performed. The supercritical fluid dyeing of PET fibres with highly developed microfibrillar structure under tautends conditions promotes changes which are characterized by an increase in crystallinity and by a diminuation of the apparent crystallite dimensions. Some changes of surface morphology of dyed fibres were observed as well.
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