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Abstract

A hyperbranched boric acid modified phthalonitrile monomer as well as a preparation method and use thereof are provided. The preparation method of the hyperbranched boric acid modified phthalonitrile monomers includes: a reaction in the mixture containing a boron source, a phenol compound, and a solvent to prepare a compound with a B—O structure; and a reaction in the mixture containing the compounds with the B—O structure, 4-nitrophthalonitrile, a catalyst, and a solvent to prepare the hyperbranched boric acid modified phthalonitrile monomers. The hyperbranched boric acid modified phthalonitrile monomers prepared in the present application can be dissolved into multiple organic solvents, thus improving the processability of the phthalonitrile monomers; meanwhile, a modified phthalonitrile resin prepared from the phthalonitrile monomers has excellent high-temperature resistance and ablation resistance, and has broad application prospects in the fields of aerospace, warship submarines, electronic packaging and the like.

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