Triptycene-based micorporous polymer is functionalized with CO2-philic tetrazole moieties via ZnCl2-catalyzed post-polymerization. Gas adsorption experiments indicate that it possesses high CO2 uptake capacity, reaching 134 cm(3) g(-1) (26.5 wt%) at 1.0 bar and 273 K, along with high selectivity towards CO2 over N-2 and CH4. The porous polymeric networks present the promising potentials as efficient adsorbents in clean energy applications.