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NAFION Hydrogen-Form Membrane Expansion

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NAFION Hydrogen-Form Membrane Expansion ( nafion-hydrogen-form-membrane-expansion )

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Procedure: Expanding Hydrogen-Form Membranes in DI Water 1. Use only DI water to prevent contamination of the membrane with undesirable elements or compounds that can affect performance later. 2. Because DI water pH is usually 6 to 7 and the treatment bath will probably tum slightly acidic (pH 6 or less), the construction materials of the bath must be carefully chosen. PVC is commonly used. 3. For expansion, membrane sheets may be suspended vertically or laid horizontally with or without mesh separators. 4. Completely cover the membranes with DI water and change the bath periodically to remove any impurities and debris that may have accumulated. Arbitrarily, we recommend changing the bath after treating 1 m2 per 5 liters of water. 5. Soak the membranes in DI water a minimum of 4 hours at a temperature of 18°C to 30°C. 6. Mesh separators between sheets are not required in horizontal DI water treatment. However, we recommend the following: - Do not treat more than 100 membranes at a time. - Increase treatment time from 14 hours to 12 hours. - Insert the membranes into the bath one at a time to minimize air bubbles adhering to the membrane and reducing expansion. 7. Only enough DI water to completely cover the membranes is required; however, the bath should be replenished frequently to prevent buildup of impurities and debris. We recommend an arbitrary bath replacement after treating 1 square meter of membrane per 5 liters of water. 8. Avoid folding or wrinkling membranes while moving them in and out of the solution. If possible, membranes should be unrolled from the shipping core directly into the water. 9. After each membrane is inserted into the tank, smooth out any wrinkles before adding the next sheet. This prevents the weight of subsequently inserted membranes from creasing and damaging membranes on the bottom of the stack. Procedure: Expanding Hydrogen-Form Membranes in Warm DI Water Additional 0.5% to 1.0% expansion can be obtained by increasing the DI water bath temperature from room temperature to 80°C. The equipment supplier or a Chemours representative will recommend the best procedure for your application; occasionally expansion temperatures to 90°C have been utilized. Procedure: Expanding Hydrogen-Form Membranes in Dilute Acid The procedure for using acid is similar to that of DI water except that: • The solution is 0.2% to 0.5% HNO, or HCI and must be very pure to prevent membrane contamination. Occasionally, higher concentrations (5%) are used. • The recommended temperature is 18°C to 60°C, depending on application and experience. • Adequate ventilation most be provided. • The membrane should be bathed several times with DI water before installation.

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