The AQUIVION is a chemically stabilized (denoted by the S-suffix) perfluorosulfonic acid (PFSA) ionomer dispersion. The chemical stabilization process is also known as end group conversion in which a large amount of polymer end groups is converted to their inert “CF3” configuration, and as such provides an excellent lifetime. The solvent system is >99% water and is free of ethers.
Aquivion PFSA dispersions are based on the unique Short Side Chain (SSC) copolymer of Tetrafluoroethylene (TFE) and Sulfonyl Fluoride Vinyl Ether (SFVE) F2C=CF-O-CF2CF2-SO2F produced by Solvay. The unique SSC copolymer allows higher crystallinity, improved mechanical properties, and better proton conductivity compared to the Long Side Chain forms of the PFSA dispersions. Solvay Aquivion PFSA ionomers are currently being offered in chemically stabilized and standard forms. Any product that is manufactured with chemically stabilized dispersion (such as self-supporting membranes, mechanically reinforced membranes, MEAs, CCMs, catalyzed electrodes, etc.) will exhibit substantially lower fluoride ion release compared to the standard ionomer (also called non-stabilized ionomer) – a sign of improved chemical durability.
Key Advantages of Aquivion’s Short Side Chain Based PFSA Dispersions:
- Very high concentration of functional groups for strong proton (or Na+, K+, Li+, etc.) conductivity
- High softening point for high-temperature operation well above 80 ºC
- Strong water retention for better fuel cell operation at low-humidity conditions for membranes or catalyst inks that are utilizing this dispersion material