Polydiallylammonium-Polysulfone Multiblock Copolymers for Moisture-Swing Direct Air Capture of Carbon Dioxide
- Colorado School of Mines, Golden, CO (United States); Arizona State University
- Arizona State University, Tempe, AZ (United States)
- Colorado School of Mines, Golden, CO (United States)
Polysulfones are an important class of materials for a variety of applications due to their excellent strength and thermal stability. Quaternary ammonium polymers are also useful materials due to their ion exchange properties, and such materials with alkaline counterions have been used to capture carbon dioxide (CO2) from ambient air through a moisture-driven mechanism. Herein, we design sulfone-based multiblock copolymers containing ammonium functionalities and demonstrate their potential for CO2 capture. Specifically, a series of multiblock copolymers containing both polydiallyldimethylammonium (PDADMA) and polysulfone (PSf) blocks were synthesized. PSf blocks provide mechanical integrity, while the PDADMA blocks enable the direct air capture of CO2. Multiblock copolymers were synthesized at high yield, and PDADMA(OH)-PSf copolymer films with good flexibility and strength were formed with IECs of 424 μmol/g (17 mol % PDADMA(OH)), 1407 μmol/g (44 mol % PDADMA(OH)), and 1726 μmol/g (50 mol % PDADMA(OH)). Thermogravimetric analysis was used to determine that all films are thermally stable up to 345 °C. Differential scanning calorimetry revealed that the 17 and 44 mol % functionalized PDADMA(OH)-PSf multiblock copolymers showed one Tg at 185 °C and 50 mol % PDADMA(OH)-PSf polymer showed a Tg at 183 °C and a second Tg at 16 °C. Atomic force microscopy showed that the multiblock polymers exhibit disordered phase separation. Furthermore, the copolymer materials displayed moisture-swing direct air capture of CO2, opening up pathways to utilize polymer architecture and chemistry to tailor the properties of promising sorbents.
- Research Organization:
- Arizona State Univ., Mesa, AZ (United States); Arizona State University, Tempe, AZ (United States); Northern Arizona Univ., Flagstaff, AZ (United States)
- Sponsoring Organization:
- USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AR0001103; SC0023343
- OSTI ID:
- 2316189
- Journal Information:
- ACS Applied Polymer Materials, Journal Name: ACS Applied Polymer Materials Journal Issue: 5 Vol. 6; ISSN 2637-6105
- Publisher:
- ACS PublicationsCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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