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A series of crosslinked porphyrin-based

polyimides (PPBPI-CRs) were synthesized from 5,10,15,20-tetra[4-[(3-aminophenyl)ethynyl]phenyl]porphyrin

(TAPEPP) and several dianhydrides via

polymerization and crosslinking reactions. PPBPI-CRs exhibited excellently

thermal and chemical stabilities. Meanwhile, PPBPI-CRs revealed decreased

Brunauer-Emmett-Teller (BET) surface areas (628 - 115 m2 g-1)

and enlarged pore sizes with increased conjugate and molecular sizes of

dianhydrides. Moreover, PPBPI-CRs had carbon dioxide uptakes (0.67 - 2.33 mmol

g-1 at 273 K and 1 bar) and CO2 isosteric enthalpies of

adsorption (19.7 - 29.6 kJ mol-1) as well as CO2/N2

selectivities (42.5, 32.21, 36.91 and 74.65).