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Polysulfone ionomers for proton-conducting fuel cell membranes - 2. Sulfophenylated polysulfones and polyphenylsulfones

In English

Författare

Summary, in English

Polysulfones and polyphenylsulfones having pendant phenyl groups with sulfonic acid units have been prepared by lithiation of the respective polymer, followed by reaction with 2-sulfobenzoic acid cyclic anhydride. The resulting ionomers were cast into membranes and properties such as thermal stability, ion-exchange capacity, water sorption and proton conductivity were evaluated. These membranes proved to have a high thermal stability, with a decomposition temperature between 300 and 350degreesC, and a high proton conductivity, 60 mS/cm at 70degreesC for a polyphenylsulfone with 0.9 sulfonic acid group per repeating unit measured at 100% relative humidity. Moreover, some of the membranes endured immersion in water at temperatures ranging from 20 to 150degreesC without swelling extensively, and therefore kept their mechanical stability under these conditions. It was also shown that these membranes retained a high conductivity up to 150degreesC under humidifying conditions. The combination of properties make these membranes potential candidates for fuel cells operating at temperatures above 100degreesC.

Publiceringsår

2005

Språk

Engelska

Sidor

1939-1946

Publikation/Tidskrift/Serie

Electrochimica Acta

Volym

50

Issue

9

Dokumenttyp

Artikel i tidskrift

Förlag

Pergamon Press Ltd.

Ämne

  • Chemical Sciences

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0013-4686