Synthesis of Nitrogen-Rich Polymers by Click Polymerization Reaction and Gas Sorption Property.

ABSTRACT: Microporous organic polymers (MOPs) are promising materials for gas sorption because of their intrinsic and permanent porosity, designable framework, and low density. The introduction of nitrogen-rich building block in MOPs will greatly enhance the gas sorption capacity. Here, we report the synthesis of MOPs from the 2,4,6-tris(4-ethynylphenyl)-1,3,5-triazine unit and aromatic azides linkers by click polymerization reaction. Fourier transform infrared (FTIR) and solid-state ¹³C CP-MAS (Cross Polarization-Magic Angle Spinning) NMR confirm the formation of the polymers. CMOP-1 and CMOP-2 exhibit microporous networks with a BET (Brunauer?Emmett?Teller) surface area of 431 m²·g^-1 and 406 m²·g^-1 and a narrow pore size distribution under 1.2 nm. Gas sorption isotherms including CO? and H? were measured. CMOP-1 stores a superior CO? level of 1.85 mmol·g^-1 at 273 K/1.0 bar, and an H? uptake of up to 2.94 mmol·g^-1 at 77 K/1.0 bar, while CMOP-2, with its smaller surface area, shows a lower CO? adsorption capacity of 1.64 mmol·g^-1 and an H? uptake of 2.48 mmol·g^-1. In addition, I? vapor adsorption was tested at 353 K. CMOP-1 shows a higher gravimetric load of 160 wt%. Despite the moderate surface area, the CMOPs display excellent sorption ability for CO? and I? due to the nitrogen-rich content in the polymers.

SUBMITTER: Song JR 

PROVIDER: S-EPMC6100294 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature