COPOLYMER, SOLID POLYELECTROLYTE MEMBRANE MADE THEREFROM, METHOD FOR PRODUCING THE COPOLYMER, AND METHOD FOR PRODUCING THE SOLID POLYELECTROLYTE MEMBRANE

摘要

PROBLEM TO BE SOLVED: To obtain at low cost a solid polyelectrolyte membrane having proton conductivity equivalent to or higher than Nafion(R).

SOLUTION: The solid polyelectrolyte membrane is obtained by the following process: A first copolymer synthesized by reaction between a tetracarboxylic acid dianhydride, a diamine having an ionically conductive functional group and a diamine having a hexafluoropropane skeleton is blended with a second copolymer synthesized by reaction between a tetracarboxylic acid dianhydride and a diamine having an ionically conductive functional group to make a copolymer, from which the objective solid polyelectrolyte membrane is made. In the above process, the ratio of a component comprising the tetracarboxylic acid dianhydride and the diamine having an ionically conductive functional group to a second component comprising the tetracarboxylic acid dianhydride and the diamine having a hexafluoropropane skeleton is set beforehand, and the first copolymer is then blended with the second copolymer, thereby the ratio set beforehand is achieved.

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