The determination of diffuse-boundary thicknesses of polymers by small-angle X-ray scattering

  • Koberstein J
  • Morra B
  • Stein R
  • 44


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Thermal density fluctuations within phases and finite interphase widths lead to systematic deviations from Porod's law. The validity of present methods used to analyze these deviations and determine diffuse-boundary widths is determined. In view of the inadequacies found in these methods, a simple yet accurate method is proposed to determine the diffuse-boundary width from direct graphical analysis of slit-smeared intensity data. The diffuse interface is modelled by a sigmoidal-gradient model which is justified on thermodynamic grounds, with the interphase thickness as a function of the Flory-Huggins interaction parameter.

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  • J. T. Koberstein

  • B. Morra

  • R. S. Stein

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