Influence of molecular precursor structure on the crystallinity of boron nitride

Processible polymers have been prepared from borazinic derivatives. They we re thermolyzed into boron nitride using an appropriate chemical and thermal treatment in order to obtain a carbon-free ceramic. Despite similar pyroly sis conditions, the crystallinity of the resulting BN was found to be diffe rent for each polymer. These differences should be related to the structure of the molecular precursors and of the polymers derived therefrom. Polymer s prepared from the borazine, (HNBH)(3), always gave the more-crystallized materials, (C) 2000 Academic Press.