Method for preparing polybenzimidazole/sulfonated polymer composite proton exchange membrane material

Abstract

The invention discloses a method for preparing a polybenzimidazole / sulfonated polymer composite proton exchange membrane material, and belongs to the technical field of preparation of functional polymer materials. The method comprises the following steps of: transforming a sulfonated polymer into a sulfonate polymer by alkali treatment, dissolving the sulfonate polymer in an organic solvent, and adding a catalyst, and tetramine monomers and dialdehyde monomers in an equimolar ratio; and stirring the mixture to obtain membrane making liquid; making a membrane and transforming the membrane to obtain the polybenzimidazole / sulfonated polymer composite proton exchange membrane material, wherein the tetramine monomers are one or any combination of compounds which have the molecular structures shown in the specifications; and each component has the advantages of uniform dispersion and simple operation. The prepared polybenzimidazole / sulfonated polymer composite proton exchange membrane material has the advantages of high mechanical strength, high electric conductivity, great improvement on dimensional stability, methanol permeability and temperature tolerance, and suitability for the fields of direct methanol fuel cells (DMFCs), the proton exchange membranes of proton exchange membrane fuel cells (PEMFCs), ion exchange resin, membrane separation, sensors and the like.

Description

technical field The invention relates to a polybenzimidazole / sulfonated polymer composite proton exchange membrane material prepared by an in-situ polymerization method, and belongs to the technical field of preparation of functional polymer materials. technical background Polymer proton exchange membrane is the key material of proton exchange membrane fuel cell (PEMFC) and direct methanol fuel cell (DMFC). important role. At present, the proton exchange membrane materials commonly used in PEMFC and DMFC are perfluorosulfonic acid membranes. This type of material has high proton conductivity, chemical and mechanical stability, but its temperature resistance, alcohol resistance, and dimensional stability Poor performance and extremely expensive, these shortcomings become one of the obstacles hindering its large-scale application in PEMFC and DMFC, so looking for a new type of non-fluorine proton exchange membrane with low cost, good temperature resistance and good alcohol re...

AI Technical Summary

Problems solved by technology

Due to the difference in the main chain structure of the acid-base polymer, there is often the problem that the base polymer cannot be fully and uniformly dispersed in the acid-base polymer matrix

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