Preparation of hybrid polymer as a near-stoichiometric SiC precursor by blending of polycarbosilane and polymethysilane

Feng Cao; Dong-pyo Kim; Xiao-dong Li

doi:10.1039/B106994M

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Feng Cao,†^a Dong-pyo Kim*^b and Xiao-dong Li^a

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* Corresponding authors

^a Key Lab of C.F.C, National University of Defense Technology, Changsha, P. R. China

^b Department of Fine Chemical Engineering and Chemistry, Chungnam National University, Taejon, Korea
E-mail: dpkim@cuvic.chungnam.ac.kr
Fax: 82-42-823-6665

Abstract

A hybrid polymer as a near-stoichiometric SiC precursor was prepared by simply blending polycarbosilane (PCS) as a carbon-rich SiC precursor and polyborazine-modified polymethylsilane (M-PMS) as a silicon-rich SiC precursor at an optimized ratio of 0.25∶1.00 (PCS∶M-PMS) by weight. The hybrid precursor showed a very high ceramic yield of 82 wt.% and higher molecular weight than that obtained using a single precursor. The excellent processibility of the hybrid precursor was proven by dry-spinning it into green fibers. Based on XRD, ¹³C MAS-NMR and ²⁹Si MAS-NMR measurements, the SiC ceramic derived from the hybrid precursor at 1400 °C showed no excess Si and little residual carbon, and a chemical composition of 98.08 wt.% SiC and 1.92 wt.% SiO₂ by SEM-EDX analysis.

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Article information

DOI: https://doi.org/10.1039/B106994M
Article type: Paper
Submitted: 01 Aug 2001
Accepted: 31 Jan 2002
First published: 05 Mar 2002

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J. Mater. Chem., 2002,12, 1213-1217

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