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An assortment of Ultem/PIM-1 polymer blends was prepared and their transport properties to a series of gases were studied. Good dispersion between the PIM-1 and Ultem phases was found when the PIM-1 loading was low (<20wt%) or high (>90wt%). A slight shift of T g was observed when the PIM-1 loading increased from 0wt% to 50wt%, suggesting likely partially miscibility. The molecular-level...
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