| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluoropolymer ion-exchange membrane which is prepared at a low cost, has an ion-exchange capacity with a wide range and a high oxidation resistance, and is especially suitable for a fuel cell. SOLUTION: This fluoropolymer ion-exchange membrane mainly comprises a long-chain branched polytetrafluoroethylene structure and has oxyhydrofluorocarbon side chains having sulfo groups, represented by [-OCH2 CF2 CF2 SO3 H], and bonded thereto. The membrane is of a proton-exchange type and has an ion-exchange capacity of 0.5-2.0 meq/g, a tensile strength in the water-containing state of 5-25 MPa, and an electrical conductivity at 25 deg.C of 0.05-0.25 Ω<-1> .cm<-1> . The production method for the ion-exchange membrane is also provided. |
