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Synthesis of polyborosilazane and its utilization as a precursor to boron nitride

✍ Scribed by Zeng-Yong Chu; Chun-Xiang Feng; Yong-Cai Song; Xiao-Dong Li; Jia-Yu Xiao

Publisher: John Wiley and Sons
Year: 2004
Tongue: English
Weight: 125 KB
Volume: 94
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.20748

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✦ Synopsis

Abstract

A new kind of polyborosilazane was synthesized from hexamethylcyclotrisilazane by exposure to boron trichloride. The pyrolysis of the precursor was carried out at 1250, 1600, and 1800°C in nitrogen for a dwelling time of 1 h. Characterizations were performed with Fourier transform infrared, X‐ray photoelectron spectroscopy, thermogravimetric analysis, and XRD techniques, and the results showed that the boron content of the precursor increased as the exposure time increased, whereas the C/Si ratio remained constant. Minor amounts of Si and C remained in residue pyrolyzed at 1250°C, but they were completely removed when their residue was further sintered at 1800°C. At that point, it only consisted of hexagonal BN crystals. Therefore, the polymer could be used as a precursor to BN in some special applications. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 105–109, 2004

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