159486-58-5Relevant articles and documents
Monoamine - double-phenol type asymmetric trifunctional kui quinoxaline benzene and oxazine and its preparation method
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Paragraph 0022; 0023, (2018/02/04)
The invention relates to an asymmetric tri-functionality quinoxalinyl benzoxazine and a preparation method thereof. The method includes: taking 4-dihydroxy benzil and 4-nitro-o-phenylenediamine as the raw materials to synthesize a quinoxaline intermediate containing a nitro group and two phenolic hydroxyl groups, carrying out catalytic reduction to obtain monoamino-bisphenol quinoxaline, then carrying out reaction with salicylaldehyde to generate a quinoxaline triphenol compound containing an iminomethyl group, conducting reduction by sodium borohydride, and then carrying out ring-closure reaction with primary amine and paraformaldehyde, thus obtaining a monoamine-bisphenol type asymmetric tri-functionality quinoxalinyl benzoxazine monomer. By means of the excellent heat resistance of the quinoxaline molecule itself, the method introduces a flexible alkyl chain and a polymerizable group so as to make the monomer has low melting point and additional polymerization crosslinking site, thereby improving the processability, and with the introduction of more oxazine rings, the polybenzoxazine resin thereof shows excellent heat resistance and good mechanical properties, and can be used for manufacturing high performance structural materials and the like.
