Polymer electrolyte membrane

摘要

Disclosed are a multi-block copolymer, its producing method and an electrolyte membrane using the same. The multi-block copolymer includes a hydrophobic block having a plurality of repeating units represented as chemical formula 1; and a hydrophilic block having a plurality of repeating units represented as chemical formula 2. The multi-block copolymer is acidified, and can be used to an electrolyte membrane and a fuel cell. The use of the multi-block copolymer as an electrolyte membrane ensures excellent dimensional stability.

主权项

1. A method for producing a branched multi-block copolymer, comprising:
(S1) forming a branched hydrophilic block by dissolving a bisphenol-based monomer or an aromatic dihalogen-based monomer; a phenol-based monomer having acid substituents, a bisphenol-based monomer having acid substituents or an aromatic dihalogen-based monomer having acid substituents; and a brancher in an organic solvent and polymerizing them; and (S2) dissolving said branched hydrophilic block formed in the step (S1), a bisphenol-based monomer, an aromatic dihalogen-based monomer and a brancher in an organic solvent and polymerizing them to produce a branched hydrophobic block and a branched multi-block copolymer at the same time, wherein, in the step (S1), the aromatic dihalogen-based monomer and the phenol-based or bisphenol-based monomer are selected to effect a reaction therebetween, and based on the monomers and the brancher, the total equivalent weight of a hydroxy group to the total equivalent weight of a halogen group is more than 70/100, not exceeding 95/100, or the total equivalent weight of a halogen group to the total equivalent weight of a hydroxy group is more than 70/100, not exceeding 95/100, wherein, throughout the steps (S1) and (S2), the total equivalent weight of a hydroxy group is the same as the total equivalent weight of a halogen group, based on the monomers and the branchers, and wherein the hydrophilic block has the total number of repeating units of 100 to 350.