Imide-linked microporous organic framework polymers for CO2 adsorption

- Imide-linked polymers with intrinsic microporosity (PIM-OFPs) have been synthesized.
- The PIM-OFPs show BET surface area up to 1381 m2 g−1 with uniform pore size distribution.
- PIM-OFPs show high CO2 uptake capacity up to 21.6 and 14.04 wt.% at 273 and 295 K respectively.

Microporous organic polymers containing CO2-philic functionality gained much attention for their efficient CO2 adsorption capability. Based on the combination of purely organic rigid and contorted macromolecular structures with low skeletal density, a series of imide-linked organic framework polymers with intrinsic microporosity (PIM-OFPs), have been synthesized using cost-effective protocol. Porosity analysis indicates that PIM-OFPs exhibit high BET surface areas ranging from 826 to 1381 m2 g−1 with uniform pore size distribution as verified by HK and NLDFT analyses. The CO2 adsorption studies show a notable uptake capacity up to 4.91 (21.60 wt.%) and 3.19 mmolg−1 (14.04 wt.%) at 273 and 295 K/1 bar respectively, combined with high isosteric heats of adsorption (28.52-30.56 kJ mol−1). At higher pressure (35 bar), these polymers also show a high CO2 uptake ability of 65.95 (295 K) and 42.84 wt. % (323 K). The impressive CO2 adsorption capacity can be attributed to the significance of the microporosity and the imide functionalities within the framework structure. Moreover, their high physicochemical stability and good CO2/N2 selectivities, PIM-OFPs considered as a potential candidate for application in CO2 scrubbing technology.

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