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US 7,301,002 B1Granted
Sulfonated polyphenylene polymers
AssigneeSandia Corporation
InventorsChristopher J. Cornelius, Cy H. Fujimoto, Michael A. Hickner
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Abstract
Improved sulfonated polyphenylene compositions, improved polymer electrolyte membranes and nanocomposites formed there from for use in fuel cells are described herein. The improved compositions, membranes and nanocomposites formed there from overcome limitations of Nafion® membranes.
Claims8
A sulfonated polyphenylene polymer, derived by controllably sulfonating a polyphenylene polymer with a sulfonating agent, the sulfonated polyphenylene polymer having repeat units of the following structure 1:
- in which
- R1, R2 and R3 are the same or different, wherein each R1, R2, and R3 is H or an unsubstituted or inertly-substituted aromatic moiety;
- Ar1 and Ar2 are the same or different, wherein each Ar1 and Ar2 is an unsubstituted aromatic moiety or inertly-substituted aromatic moiety;
- wherein a pendant side chain of a sulfonyl group attaches to a carbon atom;
- wherein from one to six sulfonyl groups are attached per repeat unit;
- wherein n≦2;
- and
- wherein any combination of R1, R2 and R3 and Ar1 and Ar2 comprises a sub-combination selected from the group consisting of:
- a) R1 is different than R2,
- b) R1 is different than R3,
- c) R2 is different than R3,
- d) Ar1 is different than Ar2, and
- e) R1═R2═R3═Ar1═Ar2.
10 more elements
Dependencies are inferred from the claim text.