Development of nano-architecture for polymer electrolytes

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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.