CO2 Capture and Low-Temperature Release by Poly(aminoethyl methacrylate) and Derivatives

Poly(aminoethyl methacrylate) (PAEMA), poly-(ethylene oxide)-block-(aminoethyl methacrylate) (PEO-PAEMA), and their guanidinylated derivates, poly(guanidine ethyl methacry-late) (PGEMA) and poly(ethylene oxide)-block-(guanidine ethyl methacrylate) (PEO-PGEMA), were prepared to study their capabilities for CO2 adsorption and release. The polymers of different forms or degree of guanidinylation were thoroughly characterized, and their interaction with CO2 was studied by NMR and calorimetry. The extent and kinetics of adsorption and desorption of N-2 and CO2 were investigated by thermogravimetry under controlled gas atmospheres. The materials did not adsorb N-2, whereas CO2 could be reversibly adsorbed at room temperature and released by an elevated temperature. The most promising polymer was PGEMA with a guanidinylation degree of 7% showing a CO2 adsorption capacity of 2.4 mmol/g at room temperature and a desorption temperature of 72 degrees C. The study also revealed relations between the polymer chemical composition and CO2 adsorption and release characteristics that are useful in future formulations for CO2 adsorbent polymer materials.

Automated summary

Poly(aminoethyl methacrylate) (PAEMA), poly-(ethylene oxide)-block-(aminoethyl methacrylate) (PEO-PAEMA), and their derivatives were studied for their capabilities for CO2 adsorption and release. PGEMA showed the most promising results with a CO2 adsorption capacity of 2.4 mmol/g at room temperature and a desorption temperature of 72 degrees C. Relations between the polymer chemical composition and CO2 adsorption and release characteristics were revealed, providing useful insights for future formulations of CO2 adsorbent polymer materials.