802557
Aquivion® D98-25BS
liquid, dispersion, 25% in water, PFSA eq. wt. 980 g/mole SO3H, contains CF3 polymer chain ends as stabilizer
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Synonym(s):
Aquivion® SO3H-form, Tetrafluoroethylene-perfluoro(3-oxa-4-pentenesulfonic acid) copolymer, Ethanesulfonic acid
Linear Formula:
(C4HF7O4S .C2F4)x
UNSPSC Code:
26111700
NACRES:
NA.23
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Quality Level
form
dispersion
liquid
eq. wt.
980±40g/mole (SO3H)
contains
CF3 polymer chain ends as stabilizer
composition
25% in water
concentration
25±1 % (w/w)
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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® D98-25BS is a perfluorosulfonic acid (PFSA) ionomer dispersion with an Equivalent Weight (EW) of 980 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® D98-25BS contains a polymer concentration of 25 wt% in a solvent system that is over 99% water and free of ethers.
Application
The superacidity of Aquivion® PFSA resins, combined with their high functional group concentration and electrochemical stability, makes them a critical ingredient in heterogeneous catalysts. Due to their excellent proton conductivity at low water uptake, these resins are frequently employed in research as ionomer binders within the catalyst layers of proton exchange membranes (PEM) for fuel cells and water electrolyzers. Additionally, they can be used in fabricating separator membranes (PEMs) either as stand-alone materials or reinforced with PTFE and are sometimes added to the surfaces of specialty fluoropolymers to enhance wettability. Aquivion® D98-25BS, with its short side chain and high equivalent weight, is a promising ionomer for balancing catalyst activity and stability. Ionomers with higher equivalent weights, such as D98-25BS, exhibit greater durability in long-term electrochemical stability tests. Moreover, D98-25BS ionomer catalysts can form smaller aggregates and agglomerates in certain catalyst systems. In these instances, the enhanced interaction between the catalyst and the D98-25BS binder can improve reaction kinetics, reduce overpotential, and enhance catalyst utilization compared to lower equivalent weight ionomers.
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
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Danger
hcodes
Hazard Classifications
Eye Dam. 1 - Skin Corr. 1C
wgk_germany
WGK 3
flash_point_f
Not applicable
flash_point_c
Not applicable
Certificates of Analysis (COA)
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