PNB„¢-R85 High Performance Anion Exchange Membrane

General Information: PNBâ„¢-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 PNBâ„¢-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 PNBâ„¢-R85 series Membrane has an ion exchange capacity of 3.5 meq/g and is lightly cross-linked to controlwater uptake. Custom PNBâ„¢ 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. PNBâ„¢-R85 Technical Data Sheet A typical lead time of 1 - 2 weeks to be expected for this product.

Membrane Properties

Membrane	Cation Exchange Membrane
Thickness	114 - 124 µm (microns)
Appearance / Color	Transparent / Colorless
Backing Foil	PET Foil
Delivery Form	Dry
Reinforcement	None
Counter Ion	H-form
Density	2.4 mg•cm-2
Selectivity	93 - 94 %
Proton Transfer Rate	6910 µmol•min-1•cm-2
Ion Exchange Capacity	0.88 - 0.91 meq•g-1
Dimensional Swelling in H2O at 25°C	13 - 14 %
Uptake in H2O at 25°C	24 wt %
Non-Std Modulus (MPa)	205 - 218 MPa
Tensile Strength - max. (MPa)	27 - 31 MPa
Yield Strength at 23°C / 50 % R.H.	9 MPa
Elongation to Break (%)	235 - 277 %
Bubble Point Test in Water at 25°C	> 3 bar