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Grafted functional groups on expanded tetrafluoroethylene (ePTFE) support for fuel cell and water transport membranes

United States Patent

9,553,327
January 24, 2017
View the Complete Patent at the US Patent & Trademark Office
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 CO.sub.2H or SO.sub.2H or SO.sub.3H 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.
Fuller; Timothy J. (Pittsford, NY), Jiang; Ruichun (Rochester, NY)
GM GLOBAL TECHNOLOGY OPERATIONS LLC (Detroit, MI)
14/ 586,132
December 30, 2014
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT The invention was made with Government support under Agreement No. DE-EE0000470 awarded by the Department of Energy--Water Transport. The Government has certain rights to the invention.