Porous polymer networks(PPNs),a class of purely organic porous materials with surface areas comparable to metal-organic frameworks(MOFs),exhibit much higher physicochemical stability due to covalent bonding in the network construction. The frequent utilization of aromatic rings lends PPNs with high adsorption enthalpy for CO2 due to the uneven distribution of electron density in aromatic system;moreover,the introduction of functionalities is feasible because aromatic rings are known for their susceptibility to organic reactions,such as electrophilic aromatic substitutions.
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