Solid state chemical transformation provides a fully benzoxazine-linked porous organic polymer displaying enhanced CO2 capture and supercapacitor performance?

Polymer Chemistry Pub Date: 2023-04-25 DOI: 10.1039/D3PY00158J

Abstract

In this study, we synthesized a fully benzoxazine (BZ)-linked porous organic polymer (POP) comprising triphenylamine (TPA) and dihydroxyterephthalaldehyde (DHPT) units through Sonogashira–Hagihara coupling of TPA- and DHTP-functionalized BZ monomers, prepared through multistep sequences involving the Schiff base formation, reduction, and Mannich reactions. The chemical structure of this fully BZ-linked POP (TPA–DHTP–BZ POP) was validated using Fourier transform infrared (FTIR) and solid-state nuclear magnetic resonance (NMR) spectroscopy. The Brunauer–Emmett–Teller surface area and total pore volume of the TPA–DHTP–BZ POP were 195 m2 g?1 and 0.53 cm3 g?1, respectively. The poly(TPA–DHTP–BZ) POP showed an impressive CO2 capture performance of 3.29 mmol g?1 and a specific capacitance of 67.1 F g?1 at 0.5 A g?1. After thermal ring-opening polymerization, a solid-state chemical transformation, the resulting poly(TPA–DHTP–BZ) POP featured Mannich bridges and phenolic groups that formed strong inter- and intramolecular hydrogen bonds, thereby enhancing the electrochemical and CO2 capture properties. Therefore, poly(TPA–DHTP–BZ) POP has the potential to be employed in practical applications for CO2 capture and as an efficient electrode for energy storage.

Graphical abstract: Solid state chemical transformation provides a fully benzoxazine-linked porous organic polymer displaying enhanced CO2 capture and supercapacitor performance
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