申请人:Sumitomo Chemical Company, Limited
公开号:EP1274147A2
公开(公告)日:2003-01-08
A polymer electrolyte membrane having outstanding water resistance and high thermal resistance, moreover having practical strength required for use as a polymer electrolyte membrane of a solid polymer electrolyte type fuel cell at low price, and a method for producing the polymer electrolyte membrane are provided. A polymer electrolyte comprising a block copolymer comprising one or more of blocks in which sulfonic acid groups are introduced and one or more blocks in which sulfonic acid groups are not substantially introduced wherein at least one block in the block copolymer is a block having aromatic rings in the polymer chain, and a porous membrane, and a fuel cell using the membrane are provided.
And moreover the present invention provides a method for producing a polymer electrolyte membrane comprising the steps of, (i) impregnating some of the pores of a porous membrane with a solution (1) of a polymer electrolyte having a contact angle of less than 90°to said porous membrane, (ii) impregnating a remaining part in the pores of the porous membrane with a solution (2) of a polymer electrolyte having a larger contact angle than that of the solution to said porous membrane, and (iii) removing the solvent.
本发明提供了一种聚合物电解质膜,它具有出色的耐水性和高耐热性,而且具有用作固体聚合物电解质型燃料电池的聚合物电解质膜所需的实用强度,价格低廉,还提供了一种生产该聚合物电解质膜的方法。本发明提供了一种聚合物电解质,该聚合物电解质由嵌段共聚物组成,嵌段共聚物包括一个或多个引入磺酸基团的嵌段和一个或多个基本上不引入磺酸基团的嵌段,其中嵌段共聚物中至少有一个嵌段是在聚合物链中具有芳香环的嵌段;本发明还提供了一种多孔膜和一种使用该膜的燃料电池。
此外,本发明还提供了一种生产聚合物电解质膜的方法,包括以下步骤:(i) 用接触角小于90°的聚合物电解质溶液(1)浸渍多孔膜的部分孔隙,(ii) 用接触角大于上述溶液的聚合物电解质溶液(2)浸渍多孔膜孔隙中的剩余部分,(iii) 去除溶剂。