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(a) Anomalous downward curvature in the time-lag curve of CO2 (feed pressure 0.2 bar) and (b) normal curve shape in the time-lag curve of CH4 (feed pressure 1.0 bar), for freshly methanol-treated membrane at 25 °C. Qualitatively, the same behavior is observed for as-cast and aged samples, and for measurements at different pressures. (c) Pressure dependence of the methane permeability (△) and nitrogen permeability (◊) of methanol-treated amine–PIM-1 membrane.
