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    6FDA-DABA (1)
    Aging (1)
    Biphenyltetracarboxylic dianhydride (1)
    Carbon molecular sieve membranes (1)
    Diaminobenzoic acid (1)
    Dimethylacetamide (1)
    Gel permeation chromatography (1)
    Hexafluoroisopropylidene diphthalic anhydride (1)
    Methyl-2-pyrrolidone (1)
    Propylene/propane separation (1)