Block polymer, process for producing a polymer, and polymer electrolyte fuel cell
AssigneeAsahi Glass Company, Limited
InventorsAtsushi Watakabe, Takeshi Eriguchi
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Abstract
A polymer electrolyte fuel cell comprising a membrane-form polymer electrolyte, a cathode disposed on one side of the polymer electrolyte, and an anode disposed on the other side of the polymer electrolyte, wherein the cathode comprises a catalyst and an ion exchange resin, and the ion exchange resin is made of a polymer comprising the following segments A and segments B: Segments A: segments made of a polymer having sulfonic acid groups; and Segments B: segments made of a fluoropolymer having substantially no ion exchange groups.
Claims8
A block copolymer comprising the following segments C′ and the following segments D and having a number-average molecular weight of from 5×103 to 5×106:
- Segments C′:
- segments made of a copolymer comprising repeating units based on a perfluorovinyl ether having a —SO2X group, wherein X is a fluorine atom, a chlorine atom or OM wherein M is a hydrogen atom, an alkali metal atom or NR1R2R3R4, wherein each of R1, R2, R3 and R4 which are independent of one another, is a hydrogen atom or a monovalent organic group, and repeating units based on tetrafluoroethylene, wherein the repeating units based on the perfluorovinyl ether are contained in an amount of at least 20 mol %;
- and
- Segments D:
- segments made of an amorphous perfluoropolymer having no ion exchange groups and having alicyclic structures in its main chain.
A block copolymer consisting essentially of the following segments C′ and the following segments E and having a number-average molecular weight of from 5×103 to 5×106:
- Segments C′:
- segments made of a copolymer comprising repeating units based on a perfluorovinyl ether having a —SO2X group, wherein X is a fluorine atom, a chlorine atom or OM wherein M is a hydrogen atom, an alkali metal atom or NR1R2R3R4, wherein each of R1, R2, R3 and R4 which are independent of one another, is a hydrogen atom or a monovalent organic group, and repeating units based on tetrafluoroethylene, wherein the repeating units based on the perfluorovinyl ether are contained in an amount of at least 20 mol %;
- and
- Segments E:
- segments made of an amorphous copolymer having no ion exchange groups and comprising repeating units based on a perfluoro(alkyl vinyl ether) and repeating units based on tetrafluoroethylene, wherein the repeating units based on the perfluoro(alkyl vinyl ether) are contained in an amount of at least 20 mol %.
Dependencies are inferred from the claim text.