| abstract |
The invention discloses a high-planar diamine monomer containing a fluorene or fluorenone structure, a synthesis method and an application thereof. In the present invention, the halogen atom of dihalogenated fluorene or fluorenone reacts with amino group to form a secondary amine; or the dihalogenated fluorene or fluorenone is cyanided, hydrolyzed, and acid chlorinated to obtain acid chloride, and then the acid chloride and amino group are used to form an amide bond; Or use dinitrofluorene or fluorenone to obtain amino groups, and then use amino groups to form urea bonds with isocyanates; or use dihalogenated fluorenes or fluorenones to obtain amino groups through Suzuki and reduction reactions, and then use amino groups and halogen atoms to form secondary amines; or use Dihalofluorenes or fluorenones react with hydroxyl groups to form ether linkages. Finally, dinitro groups containing secondary amines, amide bonds, urea bonds and ether bonds are reduced to diamines. The 3D structure of the lowest energy state of the diamine monomer of the present invention has high planarity, and it can be used as a monomer to prepare polyamide, polyimide, and polyamideimide with strong intermolecular chain interaction and small free volume and polymers such as polyureaimide. |