Vol. 4, Issue 1, Part F (2018)

Abstract
Due to the high sensitivity of the X-ray diffraction to highly ordered regions, it is usually more reliable than the other methods of measuring crystallinity. Despite the reliability of X-ray diffraction method, X-ray crystallinity may still contain small amounts of non-crystalline material, but this amount is not expected to be significant. This kind of uncertainty is usually made ineffective with the efficient use of curve fitting procedures. Isotactic monoclinicpropylene fibres produced by melt spinning with take up speed range of 2500-4250 m/min show the existence of polymorphism where αmonoclinic and smectic phases coexist together with an amorphous phase. The unit cell dimensions, crystalline density, crystallinity and crystallite size evaluations were carried out using the peak parameters obtained following the curve fitting of the equatorial X-ray diffraction profiles. Melting temperature, melting enthalpy and the crystallinity were obtained using differential scanning calorimetry technique.