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Poly(arylene ether sulfone)s with phosphonic acid and bis(phosphonic acid) on short alkyl side chains for proton-exchange membranes
Abstract
Poly(arylene ether sulfone)s have been functionalised with alkyl side chains carrying phosphonic acid and bis(phosphonic acid) in order to investigate their properties as membrane materials. The phosphonated and bisphosphonated polymers were synthesised via lithiation of poly(arylene ether sulfone)s, followed by reactions with triethyl 3-phosphonopropionate and tetraisopropyl vinylidenediphosphonate, respectively. Flexible and mechanically tough acidic membranes were cast from solution after hydrolysis of the ester groups. The significantly higher acidity and acid concentrations of the membranes containing the tetraprotic bis(phosphonic acid) led to higher conductivities in comparison to the membranes containing the diprotic phosphonic acid. Membranes containing 1.7 mmol of bis(phosphonic acid)/g dry polymer absorbed 28 wt% water when immersed at room temperature, and a conductivity of 25 mS/cm was measured at 120 °C. Moreover, the bisphosphonated membranes did not decompose at temperatures of up to 240 °C under air. The study also showed that high degrees of hydrolysis of the bisphosphonate units were crucial in order to reach the high proton conductivity and thermal stability necessary for fuel cell applications.
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Phosphonic acid derivatives showed higher proton conductivity at elevated temperature and dry state, associated with the amphoteric character of the group, allowing proton conduction by the Grotthuss mechanism.
“Phosphonic acid derivatives also showed higher proton conductivity at elevated temperature and dry state with these properties being associated with the amphoteric character of this group, allowing proton conduction by the Grotthuss mechanism”
From New modified Nafion-bisphosphonic acid composite membranes for enhanced proton conductivity and PEMFC performance (2021) · cites this paper as [41]
Phosphonic acid derivatives have better thermal stability and higher oxidation resistance than sulfonic acid derivatives.
“better thermal stability and higher oxidation resistance than the sulfonic acid derivatives.”
From New modified Nafion-bisphosphonic acid composite membranes for enhanced proton conductivity and PEMFC performance (2021) · cites this paper as [41]
Phosphonic acid groups have a smaller energy penalty than sulfonic acid groups (37.2 kJ mol-1 versus 69.9 kJ mol-1).
“phosphonic acid groups have gained much attention due to their smaller energy penalty (37.2 kJ mol -1 against 69.9 kJ mol -1 for sulfonic acid groups)”
From New modified Nafion-bisphosphonic acid composite membranes for enhanced proton conductivity and PEMFC performance (2021) · cites this paper as [41]
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Metadata
- Authors
- Parvole, J., & Jannasch, P.
- Affiliations
- Lund University (SE)
- Corresponding author
- Jannasch, Patric
- ORCID
- Jannasch, Patric
- Venue
- Journal of Materials Chemistry
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2008
- Volume
- 18
- Issue
- 45
- Pages
- 5547
- ISSN
- 0959-9428 (ISSN-L)
- 1364-5501
- OpenAlex
- W2103877048
- Cited by
- 72
- References
- 34
- Citations by year
- 2026: 1 · 2025: 2 · 2022: 2 · 2021: 3 · 2020: 2 · 2019: 4 · 2018: 4 · 2017: 6 · 2016: 2 · 2015: 5 · 2014: 7 · 2013: 8 · 2012: 13
- FWCI
- 3.89
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Materials Chemistry (publishedVersion)
- Lund University Publications (Lund University) (submittedVersion)
- Funders
- European Commission
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Fuel Cells and Related Materials
- Physical Sciences › Chemical Engineering › Filtration and Separation › Membrane Separation and Gas Transport
- Physical Sciences › Chemical Engineering › Filtration and Separation › Membrane-based Ion Separation Techniques
- Keywords
- proton exchange membranes, phosphonic acid, alkyl side chains, proton conductivity, thermal stability, water absorption, fuel cell membranes, degree of hydrolysis, lithiation
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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