METHOD OF PRODUCING COMPOSITE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a composite material which has expansibility and a high ion conductivity, especially proton conductivity, even when the operation temperature of an electrochemical cell is set to be higher than 100°C and is used in e.g. membrane fuel cells.SOLUTION: A method of producing a composite material composed of an ionomer and laminar or network functionalized silicates. The ionomer is a polymer consisting of (a) a cation exchange polymer, (b) an anion exchange polymer, (c) a polymer having both cation exchange groups and anion exchange groups in polymer chains or (d) a mixture of (a) and (b) in a mixing ratio of 100% (a) and 100% (b), with the mixture crosslinked ionically and optionally covalently.