Atmosphere influence in the pyrolysis of poly[(alkylamino)borazine] for the production of BN fibers

Abstract The effect of pyrolysis atmosphere on products deriving from poly[(alkylamino)borazine] was studied. Pyrolysis in NH 3 resulted in BN with almost no carbon content while in Ar led to BNC materials. The crystallinity of the sample obtained in NH 3 was higher than that in Ar. BN fibers with almost no carbon impurity were obtained in NH 3 and then in Ar, possessing good oxidation resistance and low dielectric constant. The superior properties of BN fibers allow them to be promising in high-temperature, microwave-transparent applications.