| 摘要 |
PURPOSE:To make a diaphragm with an extremely low electric resistance to work as a fuel barrier by preparing the diaphragm from a hydrophilic film with an ion-conducting property, which is prepared by introducing sulfo groups onto a vinyl chloride system resin. CONSTITUTION:A hydrophilic film, or a base material, is made from a thin film which is prepared by forming a vinyl chloride system resin, so that it has 0.1-3milliequivalents/g, preferably 0.2-2milliequivalents/g, by exchange capacity of sulfo groups, so that it has an electric resistance of 0.05-2OMEGA.cm<2>, preferably below 1OMEGA.cm<2>, in dilute sulfuric acid, and so that its transmission coefficient with methanol is below 5X10<-3>cm/min, preferably below 1X10<-3>cm/min. Thus made base material is integrated with at least one piece of reinforcing material selected from a microporous film, a woven fabric, a non-woven fabric and a knitting so as to obtain a hydrophilic film. Thus obtained hydrophilic film is used by interposing it between a positive electrode touching a gas containing oxygen and a negative electrode touching an anolyte, and works as a fuel-cell diaphragm having an excellent ion-conducting property. |
