Organic-inorganic hybrid microporous polymers based on Octaphenylcyclotetrasiloxane: Synthesis, carbonization and adsorption for CO2

Novel Organic-inorganic hybrid microporous polymers with excellent thermal stability, high surface areas (1041 m 2  g −1 ) and controllable pore structures have been prepared via Scholl coupling and Friedel-Crafts reactions using Octaphenylcyclotetrasiloxane (OPCTS) as the building block, the pore structure of these OPCTS-based microporous polymers can be tuned by chosing crosslinking agent with different lengths of rigid connecting structure. Moreover, the as-prepared microporous polymers can serve as desirable carbon precursor to fabricate microporous carbons with uniform micromorphology, narrow pore size distribution , high microporosity (94%) and carbonization yield (58.8%). Both the hybrid microporous polymers and microporous carbons exhibit high CO2 adsorption capacities of 8.94 wt% (2.03 mmol g −1 ) and 14.78 wt% (3.36 mmol g −1 ) (273 K and 1 bar), respectively.