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The sorption of the light gases CH4, N2, CO2 as well as water into polymer films prepared from a commercial sample of 3,3′‐4, 4′‐benzophenone tetracarboxylic‐dianhydride diaminophenylindane (Matrimid 5218) are measured. The light gas isotherms follow standard dual‐sorption behavior for polymeric films with the Henry's Law coefficient correlated to the Lennard‐Jones well depth parameter. Water sorption...
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