Grafted functional groups on expanded tetrafluoroethylene (ePTFE) support for fuel cell and water transport membranes
US9553327B2 · kind B2 · utility
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10Claims
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Key dates
| Filing date | Dec 30, 2014 |
| Grant date | Jan 24, 2017 |
| Priority date | — |
| Expiry date | Dec 30, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for forming a modified solid polymer includes a step of contacting a solid fluorinated polymer with a sodium sodium-naphthalenide solution to form a treated fluorinated solid polymer. The treated fluorinated solid polymer is contacted with carbon dioxide, sulfur dioxide, or sulfur trioxide to form a solid grafted fluorinated polymer. Characteristically, the grafted fluorinated polymer includes appended CO2H or SO2H or SO3H groups. The solid grafted fluorinated polymer is advantageously incorporated into a fuel cell as part of the ion-conducting membrane or a water transport membrane in a humidifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.