| abstract |
The present invention relates to: - an original process for the preparation of mesophasic polyborazylene. Said process is particularly advantageous in that it leads, starting from a suitable polyborazylene, rapidly — almost instantaneously — in a reproducible manner and with a good yield, to obtaining a quality product. Said method is moreover easy to implement. Said process comprises obtaining polyborazylene by polycondensation of borazine in a closed reactor and adding a solvent chosen from aromatic and borazine solvents and their mixtures, to said polyborazylene obtained by polycondensation; - mesophase polyborazylene, original, in that 'it is in the presence of a particular solvent and / or by virtue of its quality; - the use of said polyborazylene of the invention and / or prepared according to the invention, as a boron nitride precursor. |