Abstract

X-ray diffraction traces of cellulose triacetate fibres heat-treated in the range 220 – 290°C were resolved by a computational method which fits Gaussian or Cauchy functions to the peak profiles. A polynomial background is fitted at the same time so that the total area formed by the resolved peaks is a parameter for estimating crystallinity and the area under the background is a parameter for estimating the non-crystalline or disordered component. This measure of actual crystallinity is shown to be dependent upon the function chosen for the peak profile. After appropriate corrections, crystallite widths were obtained and compared with fibril widths measured on electron micrographs. Cauchy resolution data overestimate crystallite size whilst Gaussian resolution data underestimate it. In all cases the crystallites from fibres annealed at 290°C have greatly increased widths compared with crystallites from fibres annealed at 220°C or 250°C.

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