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Illustration of thermal cross-linking and TR membranes on the 2008 upper Robeson plot. (a) POM-370—(TR PEK-C with oxidative pretreatment; TCM-X(y)—(TR PEK-C with thermal treatment at x °C (y hours), [103] (b) CO2/CH4 separation performance of several polymer materials described in the literature. TR polymers (●), PIMs (■), Perfluoropolymers (◆), Polyimides (▲) Poly(RTIL)s (□), [23].
