Abstract
Charge-mosaic membranes were fabricated from pentablock copolymers of the BABCB type, poly (isoprene-b-styrene-b-butadiene-b- (4-vinylbenzyl) dimethylamine-b-isoprene), by selectively introducing anion-and cation-exchange groups into the micro-separated phases. The three-layer lamellar structure of the starting pentablock copolymer films was not disturbed by the modification. The resulting membranes showed negative osmosis for aqueous solutions of salts and highly selective transport for sodium chloride in mixed solutions of low-molecular weight organic non-electrolytes and sodium chloride when the membranes were applied to dialysis process. The selectivity was much higher than those for conventional porous membranes, reverse osmosis membrane and dialysis membrane. On the other hands, the membrane exhibited an apparent piezodialytic effect in the region of low salt concentration (<0.01M) when they were applied to piezodialytic process. The salt enrichment increased with increasing applied hydrostatic pressure difference or decreasing salt concentration. These data and recent new challenges in the membrane fabrication make us expect the advent of some practical uses of charge-mosaic membranes in the future.
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