Preparation method of cross-linked macromolecule electrolyte membrane

Abstract

The invention discloses a preparation method of a cross-linked macromolecule electrolyte membrane. The preparation method comprises the steps: firstly using 3,3'-diaminobenzidine to react with excessive 1,4,5,8-naphthalenetetracarboxylic dianhydride to obtain a pre-polymer with ends blocked by anhydride naphthalene, then using 1,4,5,8-naphthalenetetracarboxylic dianhydride to react with excessive 4, 4'-bi(-aminophenoxy) biphenyl-3,3'-disulfonic acid to obtain a pre-polymer with ends blocked by amino groups, co-polymerizing the pre-polymer with ends blocked by anhydride naphthalene and slightly-excessive pre-polymer with ends blocked by amino groups to obtain a polypyrron-sulfonated polyimide segmented copolymer with ends blocked by fewer amino groups, then mixing the copolymer with an epoxy silane coupling agent KH-560 and phenylate, dissolving the copolymer, pouring to prepare a membrane, performing proton exchange, and then further cross-linking by using polyphosphoric acid. By adopting the preparation method, the electric conductivity is improved; moreover, the swelling rate of the membrane in a plane direction is effectively inhibited, the stability is improved, and the comprehensive performance of the membrane is improved under the condition that sulfonic acid groups are not obviously lost.

Description

technical field [0001] The invention belongs to the field of polymers, and more specifically, the invention relates to a preparation method of a cross-linked polymer electrolyte membrane. Background technique [0002] Polymer electrolyte membranes, such as proton exchange membranes, are the core components of fuel cells, which must have high proton conductivity, excellent mechanical properties, good thermal and chemical stability. Sulfonated polyimide proton exchange membrane has good mechanical properties and thermal stability, but its proton conductivity is not high and requires a high degree of sulfonation, which leads to excessive swelling of the membrane, especially in the plane direction degree, resulting in a decrease in the stability of the membrane. In addition, the sulfonated polyimide proton exchange membrane still has the problem of poor resistance to free radical oxidation, which needs to be solved urgently. [0003] Therefore, it is very necessary to adjust t...

AI Technical Summary

Problems solved by technology

Sulfonated polyimide proton exchange membrane has good mechanical properties and thermal stability, but its proton conductivity is not high and requires a high degree of sulfonation, which leads to excessive swelling of the membrane, especially in the plane direction degree, resulting in a decrease in the stability of the membrane

In addition, the sulfonated polyimide proton exchange membrane still has the problem of poor resistance to free radical oxidation, which needs to be solved urgently

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