PEMFC ELECTROLYTE MEMBRANE DURABILITY ENHANCER, PEMFC COMPOSITE ELECTROLYTE MEMBRANE, COMPRISING SAME, AND PEMFC MEMBRANE ELECTRODE ASSEMBLY

The present invention relates to a PEMFC durability enhancer, a PEMFC composite electrolyte membrane manufactured using same and a membrane-electrode assembly, and to: a PEMFC composite electrolyte membrane having a PEMFC electrolyte membrane durability that decreases through chemical degradation if an electrolyte membrane is thinned, but a durability enhancer of the present invention inhibits chemical degradation of the electrolyte membrane so that electrolyte membrane durability deterioration caused by chemical degradation is prevented, and having high dimensional stability, mechanical properties and electrical stability; and a membrane electrode assembly.