Crosslinked polybenzimidazoles thin film containing sulfonic group and preparation thereof

Abstract

The invention relates to a crosslinked polybenzimidazole film containing sulfo group and a method for preparing the same. The invention is characterized in that the raw material proportions of the crosslinked polybenzimidazole film are as follows: (1) 10 proportions of 3,3',4,4'-tetraamino diphenyl ether by weight; (2) 5-10 proportions of aromatic triacid by weight; (3) 2-3 proportions of 1,2-naphthoquinone-4-ammonium sulphonate by weight; (4) 0.5-2 proportions of PEB by weight; (5) 100-200 proportions of organic solvent by weight; and (6) 200-300 proportions of polyphosphoric acid by weight. The film can effectively regulate the molecular weight of the branched polybenzimidazole and the structure of the crosslinked film by controlling the raw material proportions. The obtained polybenzimidazole has excellent solubility as well as higher thermal stability, better transparence, excellent corrosion resistance and high proton conduction rate, and the like.

Description

Cross-linked polybenzimidazole film containing sulfonic acid group and preparation method thereof technical field The invention relates to a polybenzimidazole film and a preparation method thereof, in particular to a cross-linked polybenzimidazole film containing sulfonic acid groups and a preparation method thereof. Background technique As a kind of aromatic heterocyclic polymer, polybenzimidazole has excellent heat resistance, low temperature resistance, self-lubricating property, radiation resistance, hydrolysis resistance, flame retardant and ablation resistance, etc. Excellent mechanical properties and dielectric properties, etc., especially suitable as high-temperature resistant fibers, adhesives, structural materials and functional materials, have been successfully used in radome, fairing and empennage of medium and hypersonic aircraft, ablation resistance Coatings, printed circuit boards, spacecraft radiation-resistant materials, C-class electrical insulation mater...

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Problems solved by technology

However, compared with linear polymers, although hyperbranched polymers have the advantages of good solubility and easy processing, their film-forming properties and mechanical properties are poor, so they are often processed by cross-linking, blending or tooling. Improve the properties of materials

At present, there are few literature reports on the synthesis and application of hyperbranched fully aromatic polybenzimidazoles. The main reason is that the monomers are difficult to synthesize and difficult to process [ZXLi, JHLiu, SYYang, et.al. 5729-5739.]

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