Heteroatom-rich porous organic polymers constructed by benzoxazine linkage with high carbon dioxide adsorption affinity

We report the synthesis and characterization of a new type of porous organic polymers linked by benzoxazine. The polymers were readily synthesized by condensation reaction of diamines, triphenol and paraformaldehyde. The formation of the linkage and porous structures were studied by infrared spectroscopy, solid-state ¹³C-CP MAS NMR and nitrogen sorption measurements. The porosity study revealed the resultant polymers are porous materials with surface area as high as 231 m² g⁻¹. Benzoxazine backbone endows the polymers with abundant heteroatoms (N and O), which makes these polymers promising candidates for carbon dioxide adsorption and storage. We found that the best polymer showing the highest carbon dioxide adsorption up to 6.81 wt% at 273 K and 1 bar, which is due to the most microporous structure and largest adsorption affinity. These results demonstrate a convenient approach to synthesize heteroatom-rich porous organic polymers for gas adsorption and storage.