Fluoropolymer ion-exchange membrane

摘要

An ion exchange fluorocarbon resin membrane having a storage modulus (JIS K-7244), when substituted with tributyl ammonium ions, at a temperature of not less than Tc represented by the following general equations (1-1) to (1-3) of 0.8x10<6 >Pa or more, and a heat of crystal fusion at 270 to 350° C. of 1 J/g or less: Tc (° C.)=55+Tg (EW<750) (1-1) Tc (° C.)=0.444xEW-278+Tg (750<=EW<930) (1-2) Tc (° C.)=135+Tg (EW>=930) (1-3) where Tg designates the peak temperature of loss tangent in the dynamic viscoelasticity measure-ment of the ion exchange fluorocarbon resin membrane (having SO3H as the ends of the side chains).