Bismaleimide containing 1,3,4-oxadiazole structure and preparation method thereof

Abstract

The invention relates to a bismaleimide containing a 1,3,4-oxadiazole structure and a preparation method thereof. In the structural formula of bismaleimide, substituents of R1 to R4 can be hydrogen atom, halogen atom, or same or different fat alkane of C1 to C20 and derivatives thereof, or same of different aromatic of C6 to C12 and derivatives thereof. The bismaleimide with a 1,3,4-oxadiazole structure is prepared by reacting diamine with a 1,3,4-oxadiazole structure with maleic anhydride to produce bismaleamic and performing imide cyclization reaction under the action of catalyst and dehydrating agent. The bismaleimide containing the1,3,4-oxadiazole structure has an asymmetric structure; and two reactive groups have different reaction activities in different chemical environments and can successively react at different curing temperatures. In addition, the cured product of the bismaleimide with a 1,3,4-oxadiazole structure has excellent heat resistance and is suitable for being used as a high-performance polymer composite matrix.

Description

technical field The invention belongs to the technical field of polymer materials, and in particular relates to a bismaleimide containing a 1,3,4-oxadiazole structure and a preparation method thereof. Background technique Bismaleimide is an important thermosetting polyimide with excellent properties of polyimide, such as: good thermal stability, electrical insulation properties, excellent chemical corrosion resistance, radiation resistance, heat and humidity resistance and mechanical properties, etc. At the same time, bismaleimide is a small molecule, so it has the easy processing performance similar to epoxy resin, and the molding process is flexible. The double bonds at both ends of the molecule have strong electrophilicity due to the strong electron-withdrawing effect of two carbonyl groups. It can undergo nucleophilic addition reactions with nucleophilic groups such as diamines and diphenols, and can also react with allyl compounds. Copolymerization of donating unsatur...

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Problems solved by technology

Its solubility has been significantly improved. It can be dissolved in chloroform, dichloromethane, N, N-dimethylformamide and other solvents, but the melting point is still high (266 ° C, 263 ° C), and the processing characteristics are also poor.

And not only containing high thermal oxidation resistance 1,3,4-oxadiazole heterocyclic ring but also containing bismaleimide and its preparation method of rotatable fatty ether linkage, there is no published patent or bibliographical report so far

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