Method of production of boron nitride fibers starting from borylborazines

摘要

The present invention relates to a method for manufacturing boron nitride fibers, in particular continuous fibers of boron nitride having good mechanical properties, used for the production of ceramic composite materials such as BN / BN composites, parts thermostructural or antenna radomes.; It provides and uses a precursor polymer of formula (I): wherein n is an integer, R ¹ and R ^2, identical or different, independently represent an alkyl group, and R ³ represents an amino group, a hydrogen atom, an alkyl, a cycloalkyl or a boryl.