New ways to produce porous polymeric membranes by carbon dioxide foaming

B. Krause, N.F.A. van der Vegt, Matthias Wessling

Research output: Contribution to journalArticleAcademicpeer-review

21 Citations (Scopus)

Abstract

As a new solvent free method for membrane formation, we have investigated the foaming of high-Tg polymers. We report two different routes for the formation of open-microcellular and open-nanoporous membrane morphologies. Porosity is introduced by expansion of carbon dioxide saturated films and hollow fibers at elevated temperatures. The microcellular structure manifests itself by small spot-like openings with diameters between 50 and 200 nm in the cell walls. The nanoporous structures exhibit a lacy structure with pore sizes between 2 and 50 nm. The mass transport resistance of the membrane structures is characterized in detail on the basis of gas permeation measurements.
Original languageUndefined
Pages (from-to)5-7
JournalDesalination
Volume144
Issue number1-3
DOIs
Publication statusPublished - 2002

Keywords

  • Carbon dioxide
  • Foaming
  • IR-38157
  • Membrane
  • METIS-209111
  • Glassy polymers

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