Proton exchange membranes for fuel cell applications
US7897691B2 · kind B2 · utility
12Cited by
25References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 25, 2008 |
| Grant date | Mar 1, 2011 |
| Priority date | — |
| Expiry date | May 16, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A proton conductive graft polymer comprises at least a structure unit of a sulfonated polymer side chain covalently attached to a hydrophobic perfluorocyclobutane polymer main chain. The sulfonated condensation polymer side chain has a high local ion exchange capacity while the main polymer chain is substantially free of sulfonic acid group. A membrane made from the graft polymer can provide good mechanical properties and high proton conductivity at wide range of humidity and temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.