| abstract |
(A) dissolving a hydrophobic oligomer in a first solvent to obtain a first solution, (B) dissolving a hydrophilic oligomer in a second solvent to obtain a second solution, (C) And a second solution; and an electrolyte membrane for an electrochemical cell including the multi-block copolymer thus prepared, and an electrochemical cell including the same. According to the process for preparing a multi-block copolymer according to the present invention, it is possible not only to improve the molecular weight, ion exchange capacity and yield of the copolymer, but also to increase the molecular weight uniformity and to improve the proton conductivity And it is advantageous in that proton ion conductivity is greatly improved in the pre-fluorinated region as compared with conventional fluorinated commercial electrolyte membranes. |