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. 2022 May 3;38(17):5197-5208.
doi: 10.1021/acs.langmuir.1c02321. Epub 2021 Dec 8.

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

Tony Tiainen  1 , Jere K Mannisto  1 , Heikki Tenhu  1 , Sami Hietala  1
Affiliations

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

Tony Tiainen et al. Langmuir. .

Abstract

Poly(aminoethyl methacrylate) (PAEMA), poly(ethylene oxide)-block-(aminoethyl methacrylate) (PEO-PAEMA), and their guanidinylated derivates, poly(guanidine ethyl methacrylate) (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 N2 and CO2 were investigated by thermogravimetry under controlled gas atmospheres. The materials did not adsorb N2, 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 °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.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Scheme 1
Scheme 1. Synthesis of Polymers PAEMA and PEO–PAEMA
Scheme 2
Scheme 2. Regeneration of the Primary Amine Group
Scheme 3
Scheme 3. Synthesis of the Guanidinylated Polymers PGEMA and PEO–PGEMA
Figure 1
Figure 1
IR spectra of PAEMA, PAEMA REG, and PGEMA.
Figure 2
Figure 2
1H NMR spectra of PAEMA, PAEMA REG, and PGEMA.
Figure 3
Figure 3
13C NMR spectra of PAEMA, PAEMA REG, and PGEMA.
Figure 4
Figure 4
13C NMR of PAEMA REG under CO2 and after heating.
Figure 5
Figure 5
13C NMR of PGEMA 19 under CO2 and after heating.
Scheme 4
Scheme 4. CO2 Adsorption with Primary Amines in Anhydrous Conditions
Figure 6
Figure 6
TG gas adsorption–desorption sequence and the mass changes of PGEMA 28.
Figure 7
Figure 7
TG data of PAEMA homopolymers visualized: (A) CO2 capacity, (B) desorption temperature, (C) 10 min capacity, (D) heat of desorption, and (E) recyclability during one cycle.
Figure 8
Figure 8
TG data of the PEO–PAEMA copolymers visualized: (A) CO2 capacity, (B) desorption temperature, (C) 10 min capacity, (D) heat of desorption, and (E) recyclability during one cycle.
See this image and copyright information in PMC

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