Soluble, microporous, Tröger's Base copolyimides with tunable membrane performance for gas separationElectronic supplementary information (ESI) available: Materials, synthetic details, characterization methods, analytical data as well as results obtained from quantum chemical calculations using the Dmol3 module in Materials Studio 7.0. See DOI: 10.1039/c5cc09783e

A facile two-step synthesis beginning with commercial monomers to prepare copolyimides by Tröger's Base (TB) formation provides membranes for the first time with tunable gas transport relative to hydrogen separations, CO 2 plasticization resistance, and good mechanical and thermal properties. A facile two-step synthesis to prepare copolyimides by Tröger's Base (TB) formation provides membranes for the first time with tunable gas transport and good mechanical and thermal properties.