Thermal behaviour of a series of poly[B-(methylamino)borazine] for the preparation of boron nitride fibers

✍ Scribed by Sylvain Duperrier; Rodica Chiriac; Catherine Sigala; Christel Gervais; Samuel Bernard; David Cornu; Philippe Miele

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 486 KB
• Volume: 29
• Category: Article
• ISSN: 0955-2219
• DOI: 10.1016/j.jeurceramsoc.2008.07.012

✦ Synopsis

The thermal behaviour of a series of poly [B-(methylamino)borazine] prepared at various temperatures ranging from 140 to 200 • C is studied in the present paper as potential BN fiber precursors. It was shown that the softening capability of poly [B-(methylamino)borazine] can be tailored by controlling the temperature at which polymers were prepared to achieve melt-spinning and produce high quality green fibers. Thus as-spun fibers could be next converted into boron nitride fibers using ammonia (25-1000 • C) and nitrogen (25-1800 • C) atmospheres. The quality of boron nitride fibers was shown to depend on the first part of the pyrolysis step (25 and 1000 • C; ammonia atmosphere) in which the great majority of the weight loss necessary for boron nitride production occurs. Ideal poly [B-(methylamino)borazine] as BN fiber precursors are those prepared between 170 and 180 • C. They display appropriate melt-spinnability and ceramic conversion capability.