Porous polymer networks (PPNs) is an emerging category of advanced porous materials that are of interest for carbon capture due to their high physicochemical stability and convenient functionalization process. Herein, a series of alkylamine tethered PPN-200 (PPN-200-DETA, PPN-200-TETA and PPN-200-TAEA) were prepared through a novel post-synthetic strategy. Due to the presence of alkylamine groups, PPN-200-TAEA has CO2 uptakes of 42 cm(3)/g (at 298 K and 0.15 bar) and 55 cm(3)/g (at 298 K and 1 bar), and a calculated CO2/N-2 selectivity of 289, which demonstrate its potential in postcombustion carbon capture application. (C) 2017 Published by Elsevier Ltd.