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Typical unit structures of several aromatic-based polymers used as proton exchange membrane (PEM) materials.
| Polymer Name | Typical Unit Structures |
|---|---|
| Poly aryl ether ketone (PAEK) |
|
| Polyimide (PI) |
|
| Polysulfone (PSF or PSU) |
|
| Polybenzimidazole (PBI) |
|
| Polyphenylene oxide (PPO) |
|
