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Online SAXS investigations of polymeric hollow fibre membranes

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Abstract

Polymeric membranes are used in industrial and analytical separation techniques. In this study small-angle X-ray scattering (SAXS) with synchrotron radiation has been applied for in-situ characterisation during formation of polymeric membranes. The spinning of a polyetherimide (PEI) hollow fibre membrane was chosen for investigation of dynamic aggregation processes during membrane formation, because it allows the measurement of the dynamic equilibrium at different distances from the spinning nozzle. With this system it is possible to resolve structural changes in the nm-size range which occur during membrane formation on the time-scale of milliseconds. Integral structural parameters, like radius of gyration and pair-distance distribution, were determined. Depending on the chosen spinning parameters, e.g. the flow ratio between polymer solution and coagulant water, significant changes in the scattering curves have been observed. The data are correlated with the distance from the spinning nozzle in order to get information about the kinetics of membrane formation which has fundamental influence on structure and properties of the membrane.

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Acknowledgments

The authors express thanks to Sabine Cunis and Andreas Meyer for their important support during the measuring times at HASYLAB/DESY and to Michael Schossig for provision of the SEM picture of the hollow fibre membrane.

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Authors and Affiliations

  1. GKSS Research Centre, Institute for Materials Research, Max-Planck-Str., 21502, Geesthacht, Germany

    P. Klaus Pranzas & Regine Willumeit

  2. GKSS Research Centre, Institute for Chemistry, Max-Planck-Str., 21502, Geesthacht, Germany

    Klemens Kneifel, Helmut Kamusewitz & Thomas Weigel

  3. University of Hamburg, Institute for Inorganic and Applied Chemistry, Martin-Luther-King-Platz 6, 20146, Hamburg, Germany

    Arndt Knöchel

  4. HASYLAB/DESY, Notkestr. 85, 22603, Hamburg, Germany

    Rainer Gehrke

  5. Max-Planck Institute for Colloids and Interfaces (MPI-KGF Golm), c/o HASYLAB/DESY, Notkestr. 85, 22603, Hamburg, Germany

    Sérgio S. Funari

Authors
  1. P. Klaus Pranzas
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  2. Arndt Knöchel
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  3. Klemens Kneifel
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  4. Helmut Kamusewitz
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  5. Thomas Weigel
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  6. Rainer Gehrke
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  7. Sérgio S. Funari
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  8. Regine Willumeit
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Correspondence to P. Klaus Pranzas.

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Pranzas, P.K., Knöchel, A., Kneifel, K. et al. Online SAXS investigations of polymeric hollow fibre membranes. Anal Bioanal Chem 376, 602–607 (2003). https://doi.org/10.1007/s00216-003-1986-y

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  • DOI: https://doi.org/10.1007/s00216-003-1986-y

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