Development of nano-architecture for polymer electrolytes

采用新型的单体设计和催化剂转移缩聚方法合成了嵌段共聚物电解质，该方法可以控制亲水嵌段和疏水嵌段的复合比例以及嵌段链的分散性。通过改变嵌段链长和复合比例，形成了层状和螺旋状等微相分离结构，微相分离形成的纳米结构对质子传导率和燃气渗透性能有影响。这些嵌段共聚物作为聚合物电解质燃料电池的电解质膜和催化剂层离聚物显示出优异的性能。特别地，具有高燃料气体渗透性的二嵌段聚合物在低湿度条件下提供比商业化离聚物（Nafion溶液）更高的离聚物特性。

We have synthesized block copolymer electrolytes by using novel monomer design and catalyst transfer polycondensation method, which can control the composite ratios of the hydrophilic and hydrophobic blocks and the block chains with maintenance of low molecular weight dispersity. Micro-phase separation such as lamella and gyroid structures was formed by changing the block chain length and composite ratios.Proton conductivity and fuel gas permeation were affected by the nano-structure formed by the micro-phase separation. These diblock copolymers showed excellent properties as electrolyte membranes and catalyst layer ionomer of polymer electrolyte fuel cells. Especially, the diblock polymers with high fuel gas permeability provided higher ionomer characteristics than commercialized ionomer (Nafion solution) under low humidity conditions.