802549

Aquivion^® D72-25BS

PFSA eq. wt. 720 g/mole SO₃H, liquid, dispersion, 25% in water, stabilized CF₃ polymer chain ends

• Synonym(s): Aquivion^® SO₃H-form, Tetrafluoroethylene-perfluoro(3-oxa-4-pentenesulfonic acid) copolymer, Ethanesulfonic acid
• Linear Formula: (C₄HF₇O₄S .C₂F₄)_x
• NACRES: NA.23
• UNSPSC Code: 26111700

Properties

• form: dispersion, liquid
• eq. wt.: 720±20g/mol (SO₃H)
• greener alternative product characteristics: Design for Energy Efficiency; Learn more about the Principles of Green Chemistry.
• sustainability: Greener Alternative Product
• concentration: 25±1 % (w/w)
• density: 1.14 g/mL
• greener alternative category: Enabling
• Quality Level: 100

Description

General description

Aquivion^® PFSA dispersions are derived from a short-side-chain (SSC) copolymer of Tetrafluoroethylene and Sulfonyl Fluoride Vinyl Ether (SFVE), CF2=CF2-O-(CF2)2-SO2F, industrially produced by Syensqo Group. The resulting perfluoropolymer features functional groups in their sulfonic acid form (SO3H). Aquivion^® D72-25BS is a perfluorosulfonic acid (PFSA) ionomer dispersion with an Equivalent Weight (EW) of 720 g/eq. The EW of an ionomer represents the weight of the polymer required to provide 1 mole of exchangeable protons, inversely related to the ion exchange capacity (IEC). This dispersion is chemically stabilized, with a significant proportion of polymer end groups converted to an inert trifluoromethyl (CF3) configuration, enhancing the polymer′s lifetime. Aquivion^® D72-25BS contains a polymer concentration of 25 wt% in a solvent system that is over 99% water and free of ethers.

We are committed to bringing you Greener Alternative Products, which adhere to one or more of The 12 Principles of Greener Chemistry. This product has been enhanced for energy efficiency and is intended for use as Proton Exchange Membrane (PEM) Fuel Cells. Click here for more information.

Application

The superacidity of Aquivion^® PFSA resins, combined with their high functional group concentration and electrochemical stability, makes them essential components in heterogeneous catalysts. Their excellent proton conductivity at low water uptake levels makes them ideal for fabricating separator membranes for proton exchange membranes (PEM) in fuel cells and water electrolyzers, either as stand-alone materials or reinforced with PTFE. Additionally, these resins are frequently used in research as ionomer binders within the catalyst layers of PEM devices and as binders for heterogeneous catalysis in carbon dioxide electrochemistry. They are also applied to the surfaces of specialty fluoropolymers to enhance wettability. Aquivion^® D72-25BS, with its short side chain and moderate equivalent weight, is a promising ionomer for achieving high catalyst activity and highly conductive membranes. Ionomers with lower equivalent weights, such as D72-25BS, exhibit greater proton conductivities in electrochemical tests, making them particularly suitable for PEM fuel cells and water electrolyzers. Furthermore, D72-25BS has proven effective for heterogeneous catalysts in carbon dioxide and carbon monoxide electrochemistry, as well as in electrochemical esterifications, etherifications, acylations, and carboxylations. D72-25BS is used to create catalyst ink by dispersing the catalyst, D72-25BS resin, and various solvents, typically water and low alcohols. The ink is then mixed and homogenized, for example, by shear mixing or ultrasonication. Researchers have successfully combined D72-25BS with platinum group catalysts and transition metal catalysts for various chemical reactions due to the ionomer’s resistance to highly aggressive chemical environments, including low pH, strong oxidants, and strong reducing agents.

Features and Benefits

• 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

Legal Information

Aquivion is a registered trademark of Syensqo Group

Safety Information

• Storage Class: 10 - Combustible liquids
• wgk: WGK 2
• flash_point_f: Not applicable
• flash_point_c: Not applicable