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The nature of the pore structure is one of the most important factors along with molecular properties and the interaction with the pore (a) (b) 0.12 0.05 0.1 Pore volume (cm3/g-A) Pore volume (cm3/g-A) 0.06 0.04 0.03 0.02 0.01 0.08 0.06 0.04 0.02 Pore diameter (A) Pore diameter (A) Fig. 2. Pore size distributions of 400° C treated unsupported membranes: (a) unaged, (b) 3-h aged.