Block polymer, process for producing a polymer, and polymer electrolyte fuel cell
View Patent ↗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.
1. A process for producing a polymer, which comprises polymerizing a first monomer group comprising one or more fluoromonomers in the presence of a first radical initiator and an iodine-containing fluoro-compound in a non-aqueous medium or in the absence of any solvent, to prepare a substantially amorphous polymer, and then, polymerizing a second monomer group comprising one or more monomers different from the first monomer group in the presence of the polymer and a second radical initiator in a non-aqueous medium or in the absence of any solvent.
2. The process for producing a polymer according to claim 1 , wherein the second monomer group comprises fluoromonomers, and the polymer obtained after thepolymerization of the second monomer group is substantially amorphous.
3. The process for producing a polymer according to claim 1 , wherein one of the first monomer group and the second monomer group is the following monomer group c and the other is the following monomer group d:
Monomer group c: a perfluorovinyl ether having a —SO 2 X′ group (wherein X′ is a fluorine atom or a chlorine atom) and tetrafluoroethylene; and
Monomer group d: a perfluoromonomer having no ion exchange groups and having an alicyclic structure, or a perfluoromonomer having no ion exchange groups and having an alicyclic structure and at least one other perfluoromonomer having no ion exchange groups:
4. The process for producing a polymer according to claim 1 , wherein one of the first monomer group and the second monomer group is the following monomer group c and the other is the following monomer group d′:
Monomer group c: a perfluorovinyl ether having a —SO 2 X′ group (wherein X′ is a fluorine atom or a chlorine atom) and tetrafluoroethylene; and
Monomer group d′: a perfluoromonomer having no ion exchange groups and having two double bonds to be cyclopolymerized, or a perfluoromonomer having no ion exchange groups and having two double bonds to be cyclopolymerized and at least one other perfluoromonomer having no ion exchange groups.
5. The process for producing a polymer according to claim 1 , wherein one of the first monomer group and the second monomer group is the following monomer group c and the other is the following monomer group e:
Monomer group c: a perfluorovinyl ether having a —SO 2 X′ group (wherein X′ is a fluorine atom or a chlorine atom) and tetrafluoroethylene; and
Monomer group e: a perfluoro(alkyl vinyl ether) having no ion exchange groups and tetrafluoroethylene.
6. The process for producing a polymer according to claim 2 , wherein one of the first monomer group and the second monomer group is the following monomer group c and the other is the following monomer group d:
Monomer group c: a perfluorovinyl ether having a —SO 2 X′ group (wherein X′ is a fluorine atom or a chlorine atom) and tetrafluoroethylene; and
Monomer group d: a perfluoromonomer having no ion exchange groups and having an alicyclic structure, or a perfluoromonomer having no ion exchange groups and having an alicyclic structure and at least one other perfluoromonomer having no ion exchange groups.
7. The process for producing a polymer according to claim 2 , wherein one of the first monomer group and the second monomer group is the following monomer group c and the other is the following monomer group d′:
Monomer group c: a perfluorovinyl ether having a —SO 2 X′ group (wherein X′ is a fluorine atom or a chlorine atom) and tetrafluoroethylene; and
Monomer group d′: a perfluoromonomer having no ion exchange groups and having two double bonds to be cyclopolymerized, or a perfluoromonomer having no ion exchange groups and having two double bonds to be copolymerized and at least one other perfluoromonomer having no ion exchange groups.
8. The process for producing a polymer according to claim 2 , wherein one of the first monomer group and the second monomer group is the following monomer group c and the other is the following monomer group e:
Monomer group c: a perfluorovinyl ether having a —SO 2 X′ group (wherein X′ is a fluorine atom or a chlorine atom) and tetrafluoroethylene; and
Monomer group e: a perfluoro(alkyl vinyl ether) having no ion exchange groups and tetrafluoroethylene.
9. The process for producing a polymer according to claim 1 , wherein the iodine-containing fluoro-compound is a perfluoroalkyl monoiodide.