Poly(norbornene) anion conductive membranes: homopolymer, block copolymer and random copolymer properties and performance
Abstract
It has previously been shown that phase-separated block copolymers with non-ion conducting (hydrophobic) blocks and ion conducting (hydrophilic) blocks can form efficient ion conducting channels with high ionic mobility and conductivity. Block copolymers can provide a means for phase segregation and ion channel formation while homopolymers and random copolymers have been shown to have lower ion mobility. In this study, the properties of poly(norbornene) based anion exchange membranes (AEMs) comprising homopolymers, block copolymers, and random copolymers with high ion-exchange capacity (IEC) (3.48–4.55 meq. g-1) have been investigated and compared. The polymers were cross-linked with N,N,N',N'-tetramethyl-1,6-hexanediamine before casting the membranes to avoid excessive water swelling due to high water uptake. It was shown that high ionic conductivity can be achieved in both random copolymers and homopolymers even in the absence of microphase-separated structures. For example, the conductivity of a random copolymer was 194 mS cm-1 at 80 °C, which was comparable to the block copolymer, 201 mS cm-1 at 80 °C. The H2/O2 fuel cell performance of random copolymer composite membranes showed a peak power density of 3.05 W cm-2 and peak current density of 7.85 A cm-2 at 80 °C compared to block copolymer membranes (peak power density of 3.21more »
- Authors:
-
- Georgia Institute of Technology, Atlanta, GA (United States)
- Univ. of South Carolina, Columbia, SC (United States)
- Publication Date:
- Research Org.:
- Pennsylvania State Univ., University Park, PA (United States)
- Sponsoring Org.:
- USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1799502
- Alternate Identifier(s):
- OSTI ID: 1647390
- Grant/Contract Number:
- EE0008433
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Materials Chemistry. A
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 34; Journal ID: ISSN 2050-7488
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Chemistry; Energy & Fuels; Materials Science
Citation Formats
Mandal, Mrinmay, Huang, Garrett, Hassan, Noor Ul, Mustain, William E., and Kohl, Paul A. Poly(norbornene) anion conductive membranes: homopolymer, block copolymer and random copolymer properties and performance. United States: N. p., 2020.
Web. doi:10.1039/d0ta04756b.
Mandal, Mrinmay, Huang, Garrett, Hassan, Noor Ul, Mustain, William E., & Kohl, Paul A. Poly(norbornene) anion conductive membranes: homopolymer, block copolymer and random copolymer properties and performance. United States. https://doi.org/10.1039/d0ta04756b
Mandal, Mrinmay, Huang, Garrett, Hassan, Noor Ul, Mustain, William E., and Kohl, Paul A. Thu .
"Poly(norbornene) anion conductive membranes: homopolymer, block copolymer and random copolymer properties and performance". United States. https://doi.org/10.1039/d0ta04756b. https://www.osti.gov/servlets/purl/1799502.
@article{osti_1799502,
title = {Poly(norbornene) anion conductive membranes: homopolymer, block copolymer and random copolymer properties and performance},
author = {Mandal, Mrinmay and Huang, Garrett and Hassan, Noor Ul and Mustain, William E. and Kohl, Paul A.},
abstractNote = {It has previously been shown that phase-separated block copolymers with non-ion conducting (hydrophobic) blocks and ion conducting (hydrophilic) blocks can form efficient ion conducting channels with high ionic mobility and conductivity. Block copolymers can provide a means for phase segregation and ion channel formation while homopolymers and random copolymers have been shown to have lower ion mobility. In this study, the properties of poly(norbornene) based anion exchange membranes (AEMs) comprising homopolymers, block copolymers, and random copolymers with high ion-exchange capacity (IEC) (3.48–4.55 meq. g-1) have been investigated and compared. The polymers were cross-linked with N,N,N',N'-tetramethyl-1,6-hexanediamine before casting the membranes to avoid excessive water swelling due to high water uptake. It was shown that high ionic conductivity can be achieved in both random copolymers and homopolymers even in the absence of microphase-separated structures. For example, the conductivity of a random copolymer was 194 mS cm-1 at 80 °C, which was comparable to the block copolymer, 201 mS cm-1 at 80 °C. The H2/O2 fuel cell performance of random copolymer composite membranes showed a peak power density of 3.05 W cm-2 and peak current density of 7.85 A cm-2 at 80 °C compared to block copolymer membranes (peak power density of 3.21 W cm-2 and peak current density of 8.27 A cm-2 at 80 °C). It is more critical that high water transport be achieved in AEMs than achieving a phase-segregated morphology. Finally, the homopolymer, block copolymer, and random copolymer membranes showed <1.35% degradation after aging in 1 M NaOH at 80 °C for 1000 h.},
doi = {10.1039/d0ta04756b},
journal = {Journal of Materials Chemistry. A},
number = 34,
volume = 8,
place = {United States},
year = {Thu May 07 00:00:00 EDT 2020},
month = {Thu May 07 00:00:00 EDT 2020}
}
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