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A novel asymmetric alkylaminoborazine monomer, 2-propylamino-4,6-bis(methylamino)borazine, was synthesized for the first time, and directly polymerized to give a melt-spinnable polyborazine (PBN). This asymmetric alkylaminoborazine was synthesized by an aminolysis reaction of 2,4,6-trichloroborazine (TCB) with different amines under mild conditions. This route turns out to be much cheaper and simpler...
2,4,6-Trichloroborazine has been recognized as a desirable monomer for the preparation of high-performance boron nitride fibers through polymer derived ceramics route. So a high yield and facile synthesis of 2,4,6-trichloroborazine is essential in practice. Using boron trichloride–dimethylsulfide complex ((CH 3 ) 2 S·BCl 3 ) and ammonium chloride (NH 4 Cl) as starting...
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