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 language | English |
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Pages (from-to) | 5-7 |
Journal | Desalination |
Volume | 144 |
Issue number | 1-3 |
DOIs | |
Publication status | Published - 2002 |
Keywords
- Carbon dioxide
- Foaming
- Membrane
- Glassy polymers