A kind of highly alkali-resistant polyphenylene ether anion exchange membrane and its preparation method

Abstract

The invention belongs to the technical field of fuel cells, and particularly relates to a high alkali resistance polyphenyl ether anion exchange membrane and a preparing method thereof. The preparing method comprises the steps of conducting a bromination reaction to replace methyl hydrogen atoms in the polyphenyl ether and obtaining brooethyl polyphenyl ether; conducting reaction between imidazole solution and the brooethyl polyphenyl ether so as to make imidazole replace bromine atom and obtaining imidazole functionalization polyphenyl ether; synthesizing bisphenolA and 4,4'-difluorodiphenyl sulfone to obtain polysulfone solution, conducting stem grafting of the polysulfone to the imidazole through acylation copolymerization, and finally obtaining the high alkali resistance polyphenyl ether anion exchange membrane through a gel and gelatin melting process. Due to the fact that substituent group in the imidazole and steric effect of the polysulfone can well surround positive ions, attacking of OH- under an alkaline condition is hindered, so that degradation of a membrane is hindered. Besides, the high alkali resistance polyphenyl ether anion exchange membrane has a good mechanical property and a high alkaline resistance property.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a highly alkali-resistant polyphenylene ether anion exchange membrane and a preparation method thereof. Background technique [0002] Alkaline fuel cells (Alkaline Fuel Cell, AFC) can use non-platinum materials as catalysts, which avoids the use of platinum-containing catalysts and reduces manufacturing costs; the recycling of water by alkaline membrane fuel cells effectively avoids the proton exchange membrane fuel cells. The problem of water accumulation in the battery; the good chemical stability of the alkaline membrane provides a guarantee for the service life of the battery. Therefore, alkaline membrane fuel cells have become a new research hotspot in the field of fuel cells. [0003] At present, the synthesis method of the alkaline membrane of the fuel cell is to graft the quaternary ammonium cationic group or the quaternary phosphonium cationic group on th...

AI Technical Summary

Problems solved by technology

However, in a relatively alkaline environment, the N1, C2, and N3 substitution positions on the imidazole ring are all affected by OH to varying degrees. - The attack of the anion exchange membrane leads to the decrease of the ion exchange capacity and conductivity of the anion exchange membrane, which is difficult to meet the application of practical fuel cells.