AI Article Synopsis
- The study focused on improving the working temperature and durability of short side chain perfluorosulfonic acid (SSC-PFSA) Aquivion membranes through a thermal annealing process.
- The Ionomer n Analysis (INCA method) was used to assess the thermal and mechanical properties, revealing increased crystallinity and enhanced polymer stability after annealing.
- Measurements confirmed that the annealing increased the stiffness of the membranes across a range of temperatures, leading to significant thermal and mechanical improvements in both extruded and cast membranes.
Article Abstract
We investigated the possibility to increase the working temperature and endurance of proton exchange membranes for fuel cells and water electrolyzers by thermal annealing of short side chain perfluorosulfonic acid (SSC-PFSA) Aquivion membranes. The Ionomer n Analysis (INCA method), based on n/T plots where n is a counter elastic force index, was applied to SSC-PFSA in order to evaluate ionomer thermo-mechanical properties and to probe the increase of crystallinity during the annealing procedure. The enhanced thermal and mechanical stability of extruded Aquivion 870 (equivalent weight, EW = 870 g·mol) was related to an increase of long-range order. Complementary differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) measurements confirmed the increase of polymer stiffness by the annealing treatment with an enhancement of the storage modulus over the whole range of temperature. The main thermomechanical relaxation temperature is also enhanced. DSC measurements showed slight base line changes after annealing, attributable to the glass transition and melting of a small amount of crystalline phase. The difference between the glass transition and melting temperatures derived from INCA plots and the ionic-cluster transition temperature derived from DMA measurements is consistent with the different experimental conditions, especially the dry atmosphere in DMA. Finally, the annealing procedure was also successfully applied for the first time to an un-crystallized cast membrane (EW = 830 g·mol) resulting in a remarkable mechanical and thermal stabilization.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6835819 | PMC |
| http://dx.doi.org/10.3390/membranes9100134 | DOI Listing |
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