Abstract
A new membrane, called the pore-filling membrane, was proposed. The membrane is composed of two kinds of polymer materials. One is a porous substrate film or hollow fiber which is inert to organic liquids, and the other is a polymer, soluble with only specific solvents, filling the substrate pores. The solubility difference of the filling polymer exhibits permselectivity, and the substrate matrix restrains the swelling of the filling polymer. The membrane showed high separation performances based on the concept, and moreover the membrane performances can be predicted by model simulation. Thus, membrane design can be realized with high performances. Also, the pore-filling membrane can be used for membranes of polymer electrolyte fuel cells. Proton conductivity was achieved through the filling electrolyte polymer inside the porous matrix. Fuel crossover was restricted by suppression of the swelling of the electrolyte polymer, and the mechanical strength at high temperature was maintained by the substrate. The membrane showed high fuel cell performances for both PEMFC and DMFC.
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