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A membrane containing 7–23nm polystyrene sulfonate domains was prepared using a reactive block polymer precursor and evaluated for its ammonia selectivity. The ammonia permeability is over 20.1×10 −17 kmolm/(m 2 sPa) (600barrers) at 25°C and 2×10 5 Pa (2bar) pressure; the selectivity for a mixed gas feed containing ammonia and nitrogen is over 90, about the same selectivity...
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