Abstract
The need to take into account the anisotropy of compact samples pressed from grinded polypropylene (PP) fibres at a determination of the degree of polymer crystallinity by X-ray method was shown. It was proved that the breach of the spherical scattering symmetry of X-rays by PP fiber samples is not connected with an amorphous phase of polymer. The method for calculating the degree of crystallinity of fibres from the normalized intensity of the diffuse halo of preparations under study and standard powder PP samples was proposed.
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