| abstract |
A membrane-forming dope for non-solvent induced phase separation methods, the membrane-forming dope comprising 15 to 40 wt.% of polysulfone-based resin, 5 to 60 wt.% of polyvinylpyrrolidone, and 0.1 to 10 wt.% of polyoxyethylene sorbitan fatty acid ester, all of which are dissolved in a water-soluble organic solvent solution. A porous hollow fiber membrane is produced by spinning the membrane-forming dope by a non-solvent induced phase separation method using an aqueous liquid as a core liquid. The obtained high-performance porous hollow fiber membrane can be used as a water vapor permeable membrane used in fuel cells, because its water vapor permeability is not significantly reduced even after use in a high temperature environment such as, for example, 100 to 120°C. |