New ways to produce porous polymeric membranes by carbon dioxide foaming

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

Research output: Contribution to journalArticleAcademicpeer-review

24 Citations (Scopus)


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 languageEnglish
Pages (from-to)5-7
Issue number1-3
Publication statusPublished - 2002


  • Carbon dioxide
  • Foaming
  • Membrane
  • Glassy polymers


Dive into the research topics of 'New ways to produce porous polymeric membranes by carbon dioxide foaming'. Together they form a unique fingerprint.

Cite this