Analysis of small angle x‐ray scattering intensity of hard elastic polypropylene under extension

Abstract

The influence of the changes in density and the extension distribution function on the profiles of the small angle X-ray scattering of a hard elastic polypropylene film under extension was investigated. So far the scattering behavior of crystalline polymers, consisting of nearly parallel lamellae and intervening layers staked perpendicular to the fiber axis, has been described based on the lattice factor and the structure factor of a constant density difference. In this work it could be shown that the structure factor depends not only on the thickness, decided by the extension distribution function, but also on the density changing with the extension of each layer. Good agreement with the observation that the profile greatly changes in shape and intensity with extension could be obtained by introduction of an extension distribution function and a density function for the intervening layers.