期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 29, 期 5, 页码 851-855出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2008.07.012
关键词
Poly[B-(methylamino)borazine]; TMA; Softening; Spinnability; TGA; Pyrolysis; Fibers
The thermal behaviour of a series of poly [B-(methylamino)borazine] prepared at various temperatures ranging from 140 to 200 degrees 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 degrees C) and nitrogen (25-1800 degrees C) atmospheres. The quality of boron nitride fibers was shown to depend on the first part of the pyrolysis step (25 and 1000 degrees 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 degrees C. They display appropriate melt-spinnability and ceramic conversion capability. (c) 2008 Elsevier Ltd. All rights reserved.
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