摘要:
A polymer electrolyte membrane made of a polymer having a low electrical resistance, high heat resistance and is strong against repeats of swelling and shrinkage. Thus, a membrane/electrode assembly for polymer electrolyte fuel cells having high power generation performance and excellent in durability can be provided. The polymer has repeating units represented by the following formula (U1 ) and repeating units represented by the following formula (U2):
摘要:
A method for producing a fluorinated polymer, which comprises carrying out polymerization in a container capable of polymerizing a monomer in a pressurized state, in the presence of at least one of specific four organic peroxides, in a polymerization medium containing at least one fluorinated solvent (B) having a boiling point at normal pressure of at most 60° C., using at least a fluorinated monomer (C) having a boiling point at normal pressure higher than said fluorinated solvent (B), and tetrafluoroethylene, at a temperature of at most 70° C. and at least the boiling point at normal pressure of a fluorinated solvent (B) having the lowest boiling point at normal pressure among said fluorinated solvent (B).
摘要:
To obtain a nonwoven fabric which is excellent in the heat resistance and the chemical resistance, of which the fiber diameter is small, and which is excellent in the mechanical strength at a temperature at which it is used; and an electrolyte membrane which is excellent in the dimensional stability when it is swollen by water, and of which an increase in the resistance by a reinforcing material is suppressed.A nonwoven fabric 28 containing fibers 26 of an ethylene/tetrafluoroethylene copolymer having a storage elastic modulus E′ at 25° C. of at least 8×108 Pa and a melt viscosity measured at 300° C. of higher than 60 Pa·s and at most 300 Pa·s, wherein the average fiber diameter of the fibers is from 0.01 to 3 μm; and an electrolyte membrane reinforced by the nonwoven fabric 28.
摘要:
A polymer electrolyte membrane made of a polymer has a low electrical resistance, high heat resistance and is strong against repeats of swelling and shrinkage. Thus, a membrane/electrode assembly for polymer electrolyte fuel cells having high power generation performance and excellent in durability can be provided.For a polymer electrolyte membrane 15 or for a catalyst layer 11 constituting electrodes 13 and 14, a polymer comprising units (U1) and units (U2) is used: Q1, Q2, Q3: a perfluoroalkylene group which may have —O— or the like; Rf1, Rf2: a perfluoroalkyl group which may have —O—; X1, X2: an oxygen atom or the like; a, b: 0 or the like; Y1, Y2: a fluorine atom or a monovalent perfluoroorganic group; and s, t: 0 to 1.
摘要:
A method for producing a fluorinated polymer containing fluoroolefin units as the main constituting units, wherein CF.sub.3 (CF.sub.2).sub.n CH.sub.2 CH.sub.3 or CF.sub.3 (CF.sub.2).sub.n H, wherein n is an integer of from 1 to 8), the is used as the polymerization medium, and CF.sub.2 ClCF.sub.2 CHClF and/or CF.sub.3 CF.sub.2 CHCl.sub.2 as a chain transfer agent.Using the polymerization medium which is less likely to bring about an environmental destruction, it is possible to obtain a fluorinated polymer excellent in the heat resistance, solvent resistance, chemical resistance, etc. Further, the above chain transfer agent has good compatibility with the polymerization medium which scarcely brings about the environmental destruction, whereby it is possible to efficiently produce a fluorinated polymer excellent in the heat resistance and solvent resistance. This chain transfer agent has affinity to the resulting polymer and to the polymerization medium and has excellent handling efficiency for post treatment such as granulation or drying.
摘要:
A polymer electrolyte membrane made of a polymer has a low electrical resistance, high heat resistance and is strong against repeats of swelling and shrinkage. Thus, a membrane/electrode assembly for polymer electrolyte fuel cells having high power generation performance and excellent in durability can be provided.For a polymer electrolyte membrane 15 or for a catalyst layer 11 constituting electrodes 13 and 14, a polymer comprising units (U1) and units (U2) is used: Q1, Q2: a perfluoroalkylene group which may have —O— or the like; Rf1, Rf2: a perfluoroalkyl group which may have —O—; X: an oxygen atom or the like; a: 0 or the like; Y, Z: a fluorine atom, or a monovalent perfluoroorganic group such as —CF3; S: 0 to 1; and t: 0 to 3.
摘要:
To obtain a nonwoven fabric which is excellent in the heat resistance and the chemical resistance, of which the fiber diameter is small, and which is excellent in the mechanical strength at a temperature at which it is used; and an electrolyte membrane which is excellent in the dimensional stability when it is swollen by water, and of which an increase in the resistance by a reinforcing material is suppressed.A nonwoven fabric 28 containing fibers 26 of an ethylene/tetrafluoroethylene copolymer having a storage elastic modulus E′ at 25° C. of at least 8×108 Pa and a melt viscosity measured at 300° C. of higher than 60 Pa·s and at most 300 Pa·s, wherein the average fiber diameter of the fibers is from 0.01 to 3 μm; and an electrolyte membrane reinforced by the nonwoven fabric 28.
摘要:
A polymer electrolyte membrane made of a polymer has a low electrical resistance, high heat resistance and is strong against repeats of swelling and shrinkage. Thus, a membrane/electrode assembly for polymer electrolyte fuel cells having high power generation performance and excellent in durability can be provided.For a polymer electrolyte membrane 15 or for a catalyst layer 11 constituting electrodes 13 and 14, a polymer comprising units (U1) and units (U2) is used: Q1, Q2: a perfluoroalkylene group which may have —O— or the like; Rf1, Rf2: a perfluoroalkyl group which may have —O—; X: an oxygen atom or the like; a: 0 or the like; Y, Z: a fluorine atom, or a monovalent perfluoroorganic group such as —CF3; S: 0 to 1; and t: 0 to 3.