Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1394723 | European Polymer Journal | 2015 | 12 Pages |
•Aminopyridine tethered Udel can be doped with phosphoric acid.•Imidazole can be used as crosslinker.•Membrane properties depend on the phosphoric acid content.•Bisphenol A units degrade first, and future materials should use Radel backbones.
Udel polysulfone based membranes with 4-aminopyridine pendant groups and cross-linking imidazole units are synthesized in a simple two step reaction. The ratio of 4-aminopyridine and imidazole is varied and the materials are extensively characterized. The average phosphoric acid uptake (in 85 wt% PA) ranges between 90 wt% and 452 wt% depending on the ratio of 4-aminopyridine and imidazole and the membranes show good proton conductivity of up to 65 mS cm−1 at 160 °C under non-humidified conditions. The applicability of these materials as a polymer electrolyte membrane was proven by single cell tests at 130 °C. The relationships between PA uptake, chemical composition and mechanical stability are reported. Proton conductivity and mechanical properties only depend on the phosphoric acid content, which, however is a function of the chemical composition.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide