(339i) Alkyl Amine Incorporation in Functional and Processible Porous Organic Polymers for CO2 Capture Applications

Porous sorbent materials have been considered as one of the potential material technologies for use in CO₂ capture applications. Porous organic polymers (POPs) and particularly their soluble class polymers with intrinsic microporosity (PIMs) have been extensively studied in gas separation applications. PIMs are mostly considered as a membrane material due to their high free volume and easy processability properties. Although PIMs possess high surface area and microporosity desired for a sorbent, they also suffer from low CO₂ adsorption capacity (<9 cc/g, 0.15 bar and 298K) due to relatively large (>1nm) non-polar micropores as well as some mesopores, limiting their use in sorbent applications. Here, we present novel PIM-based chemical sorbent synthesis and characterization. We synthesized and post-synthetically functionalized PIM-1 with carboxylic acid and amide groups.^1-2 The main scope of this study is to create acidic functional groups on the porous media to interact with basic amine molecules to ensure a strong connection between the sorbent and amines. These sorbents not only showed the highest (five fold more than PIM-1) CO₂ capture capacity and CO₂/N₂ selectivity reported in all PIMs to date, they also provide scalable, stable and processible sorbent design, which can be adjusted into a library of different materials. Primary amines append to porous polymers through acid-base and hydrogen bonding interaction, creating a starting point for future amine-based PIMs studies focusing on the sorbent stability and performance. The synthesis, characterization and processibility of the discoverd sorbents will be presented with evaluation of their CO2 capture performance.

References

1. Sekizkardes, A. K.; Hammache, S.; Hoffman, J. S.; Hopkinson D. “Polymers of Intrinsic Microporosity Chemical Sorbents Utilizing Primary Amine Appendance Through Acid−Base and Hydrogen Bonding Interactions” ACS Appl. Mater. Interfaces 2019, 11, 30987-30991.

2. US20220032268A1, patent granted in Feb 2022, Hopkinson, D. and Sekizkardes, A.K.