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: A selective solvent was used to develop a uniform microporous structure in a polystyrene-polymethylmethacrylate block copolymer. Pore diameters in the range of 200-500 angstroms were produced. Gas permeation measurements demonstrated a dramatic, five order of magnitude, increase in permeability coefficient associated with the throughgoing microporous structure. These high-flux membranes retained some selectivity for certain gas pairs as expected for transport based on Knudsen diffusion in the porous materials.... Microporous membranes, Gas separations, Knudsen diffusion, Block copolymers.

Note: Selectivity and Permeability of Microporous Block Copolymer Membranes