Hydrolyzation tolerant sulfonated polyimide proton exchange membrane and preparation thereof

Abstract

The invention discloses a hydrolysis-resistant sulfonated polyimide proton exchange membrane and a preparation method thereof; the hydrolysis-resistant sulfonated polyimide proton exchange membrane is provided with the following constitutional repeating units. In the invention, a sulfonic acid group and a terminal amino group are respectively connected with different benzene rings by a condensation reaction, and a perfluoro group is introduced to a benzene ring with an amino group, thus strengthening the hydrophobicity of the terminal amino group part, inhibiting ring opening and degradation of the imide bond resulting from the strong hydrophilic sulfonic acid group in a molecular structure of the proton exchange membrane and improving the chemical stability of the proton exchange membrane.

Description

technical field The invention relates to a polymer material membrane and a preparation method thereof, in particular to a hydrolysis-resistant sulfonated polyimide proton exchange membrane for fuel cells and a preparation method thereof. Background technique In direct methanol fuel cell application engineering, if the methanol permeability of the proton exchange membrane is high, a large amount of methanol will permeate to the other side of the membrane to directly react with the oxidant, thereby reducing the energy efficiency of the fuel cell. Sulfonated polyimide proton exchange membrane not only has high proton conductivity, but also has low methanol permeability, so it has attracted extensive attention in the field of proton exchange membrane research. However, the sulfonic acid-substituted benzene ring in the molecular structure of traditional polyimide proton exchange membranes is directly connected to the imide bond. The amine bond group undergoes ring-opening degrad...

AI Technical Summary

Problems solved by technology

However, the sulfonic acid-substituted benzene ring in the molecular structure of traditional polyimide proton exchange membranes is directly connected to the imide bond. The amine bond group undergoes ring-opening degradation in the acidic working environment of the proton exchange membrane, thereby losing the proton conductivity of the proton exchange membrane

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