Sulfonated calixarene grafted polybenzimidazole proton exchange membrane material and preparation method thereof

Abstract

The invention discloses a sulfonated calixarene grafted polybenzimidazole proton exchange membrane material and a preparation method thereof. The structural formula of the proton exchange membrane material is shown in the specification, wherein n is an integer between 5000 and 10000. According to the invention, sulfonated calixarene is grafted to polybenzimidazole to design the proton exchange membrane material based on sulfonated calixarene grafted polybenzimidazole; the strength problem of the proton membrane is solved by utilizing the rigidity of polybenzimidazole, the electric conduction problem of the proton membrane is solved by utilizing the sulfonation structure of the calixarene, a channel can be provided for proton transfer by utilizing an electron-rich structure model in calixarene, and the problem of large-scale proton migration is well solved.

Description

technical field [0001] The invention relates to the technical field of proton exchange membrane materials, in particular to a proton exchange membrane material and a preparation method of sulfonated calixarene grafted polybenzimidazole. Background technique [0002] Polybenzimidazole (PBI) is a class of polymers containing imidazole groups in the molecular chain. Due to its high glass transition temperature, good chemical stability and mechanical stability, it is widely used in the field of proton exchange membranes. It has a good application prospect. PBI itself does not have a group that can transfer protons, but after being doped with acid, it can obtain a certain proton conductivity, and the imidazole group under acidic conditions will be protonated and positively charged, which can effectively block the cross-penetration of vanadium ions . As a functional material with excellent stability and mechanical properties, PBI has been widely used in fields such as hydrogen f...

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Problems solved by technology

In the high-temperature fuel cell operation test, it was found that there was a loss of phosphoric acid, so the proton conductivity of the membrane could not be maintained at a stable level, and there was a certain degree of decline

At the same time, the common commercial polybenzimidazoles on the market are mostly obtained by polycondensation of biphenyltetramine with a rigid structure, resulting in poor polymer solubility, which limits the promotion and application of polybenzimidazoles in the field of high-temperature proton exchange membranes. further development

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