Abstract
The mean square fluctuation of the electron density of a multi-phase system is determined by the electron densities and the volume fractions of the phases of the system. On the other hand the same quantity can be measured directly by means of small angle X-ray scattering (SAXS). For the interpretation of the measuring value obtained additional information is required. In the case of a two-phase-system the knowledge of the electron density difference between the two phases enables the determination of their volume fractions and vice versa. The knowledge of further parameters is necessary for the evaluation of a three-phase-system. It is shown that for the determination of the void fraction of a semi-crystalline high polymer the crystallinity of the sample must be taken into account, especially when the void fraction is small.
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Jánosi, A. Röntgenkleinwinkelstreuung von Mehrphasensystemen Interpretation der Elektronendichtefluktuation. Monatsh Chem 114, 377–383 (1983). https://doi.org/10.1007/BF00798435
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DOI: https://doi.org/10.1007/BF00798435