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A highly selective carbon molecular sieve (CMS) membrane derived from a novel spirobisindane-based polyimide was synthesized. The mixed-gas ethylene/ethane selectivity of 15.6 at 20 bar is the highest reported value for CMS-type membranes to date.doi:10.1039/c6ra24699k fatcat:ci7tvxui4na3de7cgxdcfniw24