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Chemours (formerly DuPont) Nafion™ PFSA polymer dispersions are made from chemically stabilized perfluorosulfonic acid (PFSA) / polytetrafluoroethylene (PTFE) copolymer in the acid (H⁺) form, and are available in several polymer content and dispersant compositions. Typical uses include fabrication of thin films and coating formulations for fuel cell membranes, catalyst coating, sensors, and a variety of electrochemical applications.
Fuel Cell Applications: Nafion™ D2021 Dispersion (a diluted, liquid form of the same chemical used for a PEM fuel cell membrane) drastically reduces the amount of platinum needed as a catalyst by exposing a larger fraction of the platinum to the hydrogen gas. Also, the Nafion™ acts as a binding agent to hold the platinum, membrane, and gas diffusion layer together.
Nafion™ Dispersion D520, D521, D2020, and D2021 are considered hazardous items under DOT and IATA regulation. Dispersions over 30 mL will incur a hazardous fee to accommodate the regulations based on the final shipping location.
Please note that dispersions contain solvents that may compromise the seals of the bottles if the solvents are left in direct contact with the lids for long periods of time. We recommend always storing the bottles in an upright orientation as soon as the shipment is received to lessen the likelihood of inadvertent leakage.
Please contact us if you plan to order over 1 Liter of various dispersions.
|Nafion PFSA Polymer Dispersions Properties|
|Equivalent Weight (EW)||1100|
|Polymer Content (wt. %)||20.0 min and 22.0 max|
|Water Content (wt. %)||34 ± 2|
|VOC Content (wt. %)||46 ± 2|
|VOC Content (wt. %) - 1-Propanol||44 ± 2|
|VOC Content (wt. %) - Ethanol||< 2|
|VOC Content (wt. %) - Mixed Ethers and Other VOCs||< 1|
|Specific Gravity||1.01 - 1.03|
|Available Acid Capacity (meq/g, H+ polymer basis)||> 0.92|
|Total Acid Capacity (meq/g, H+ polymer basis)||0.95 - 1.03|
|Viscosity (cP; at 25C and 40 sec-1 Shear Rate)||50 - 500|
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