General Information:

PNB™-R85 anion exchange membrane are robust and mechanically reinforced for their form factor, manufactured with PFAS-free polynorbornene ion-conductive polymer. The mechanical reinforcement makes the membranes tough, easy-to-handle, and suitable for pressurized or unpressurized systems. The ion-conducting portion of the PNB™-R85 membrane is based on the functionalized norbornene chemistry which has very high anion conductivity compared to other equivalent materials in the market, has excellent chemically and mechanically stability and ideal for demanding applications. The PNB™-R85 series Membrane has an ion exchange capacity of 3.5 meq/g and is lightly cross-linked to control water uptake. Custom PNB™ membranes with lower or higher ion exchange capacity (such as IEC 1.5 to 4.0) and/or higher or lower water uptake can be made via changing the degree of crosslinking and for such custom inquiries, please contact us at sales@fuelcellstore.com and there will be minimum order quantity for such customized requests.

Applications:

Anion exchange membrane based alkaline water electrolyzers (with concentration being in the range of 0 to 1 Molar), anion exchange membrane based alkaline fuel cells, and other similar electrochemical applications.

Handling:

Use proper protective gloves (powder free) while handling the membrane in a clean area. The membranes are shipped in a pH-neutral form (i.e., bromide anion).

Storage:

The membrane is shipped dry with bromide counter-ion and can be stored for an unlimited amount of time as-received. Some color change may occur when the membrane is hydrated which does not affect its conductivity or performance. The bromide counter-ion can be exchanged for other anions, including hydroxide ions. The membrane can also be stored hydrated or wet. The membrane can be dried with halide, nitrate or (bi)carbonate counter-ion but not dried with hydroxide counter-ion due to the resulting extreme pH.

Pretreatment for Electrolysis or Fuel Cell Applications:

PNB AEMs are provided hydrated and in bromide form. To exchange the bromide for hydroxide ions, soak the membrane in a 1.0 M KOH or NaOH solution for several hours. Rinse with DI water prior to use to remove any surface hydroxide salt. Note, carbon dioxide in the air may convert some of the hydroxide to (bi)carbonate, which can be reversed by soaking in hydroxide solution.

If you have any questions about storage, performance and pretreatment, please feel free to contact us for further information.

PNB™-R85 Technical Data Sheet

A typical lead time of 1 - 2 weeks to be expected for this product.

Membrane Properties
Membrane Type	Anion exchange membrane
Thickness	~85 microns (dry), ~106 microns (hydrated, bromide form)
Appearance / Color	White
Delivery Form	Dry
Reinforcement	Yes (Proprietary Olefin)
Counter Ion	Bromide
Hydroxyl Ion Conductivity (mS/cm)	~70 mS/cm (In-plane conductivity, OH- form at RT)
Ion Exchange Capacity	~3.5 meq/g
Water uptake (wt%)	40% to 45% (at RT in DI-Water)
Dimensional Swelling in H2O at 25°C	3% to 6% (at RT in DI-Water)
Tensile Strength - max. (MPa)	> 30 MPa
Elongation to Break (%)	> 35%
Glass Transition Temperature	170 to 190 deg C