Development of nano-architecture for polymer electrolytes

我们采用新颖的单体设计和催化剂转移缩聚的方法合成了嵌段共聚电解质，在保持低分子量分散性的同时，可以控制亲、疏水嵌段和嵌段链的复合比例。通过改变区块链长度和复合比，形成了片状和陀螺体等微相分离结构，微相分离形成的纳米结构对质子电导率和燃气渗透率有影响。这些二嵌段共聚物作为聚合物电解质燃料电池的电解膜和催化层离聚体表现出优异的性能。特别是，在低湿度条件下，具有高燃料气体渗透性的二嵌段聚合物提供了比商品化离聚体(Nafion溶液)更高的离聚体特性。

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.