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Hydroboration of polymethylvinylsilane — a novel route to silicon boron carbide ceramics

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Abstract

Polymethylvinylsilanes (PMVS) of the general composition [R2Si]m [RR′Si]n with R=CH3 and R′=CH=CH2 (vinyl) have been synthesized by the dechlorination of dichlordimethylsilane (CH3)2SiCl2 and dichlormethylvinylsilane CH3(CH2=CH) SiCl2 with sodium in toluene. Subsequently, the vinyl groups have been hydroborated by the reaction of the as-synthesized polysilane with various borane adduct compounds such as dimethylsulphide borane (CH3)2S·BH3. The hydroborated polymer was characterized by infrared and 13C-, 1H-, and 11 B-NMR spectroscopy as well as by the measurement of the molecular weight distribution. The pyrolysis of the boron-containing polysilane at 1100 °C in argon results in the formation of X-ray amorphous silicon boron carbide, SixCx+yBz in 63% yield. The crystallization behaviour of the polymer-derived covalent ceramic product at temperatures up to 2200 °C is discussed. The microstructure was characterized by transmission electron microscopy. Analytical results were obtained with the novel electron spectroscopic imaging (ESI) technique.

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Author notes

  1. R. Riedel

    Present address: Fachbereich Materialwissenshaft, Technische Hochschule Darmstadt, Fachgelbiet Dispere Festshoffe Hilperstrasse, 31, 6100, Darmstadt, Germany

Authors and Affiliations

  1. Institut für Anorganische Chemie der Universität Stuttgart, Pfaffenwaldring 55, 7000, Stuttgart, 80, Germany

    R. Riedel

  2. Pulvermetallurgisches Laboratorium, Max-Planck-Institut für Metallforschung, Institut für Werkstoffwissenschaft, Heisenbergstrasse 5, 7000, Stuttgart, 80, Germany

    A. Kienzle, V. Szabó & J. Mayer

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  1. R. Riedel
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  2. A. Kienzle
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  3. V. Szabó
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  4. J. Mayer
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Riedel, R., Kienzle, A., Szabó, V. et al. Hydroboration of polymethylvinylsilane — a novel route to silicon boron carbide ceramics. JOURNAL OF MATERIALS SCIENCE 28, 3931–3938 (1993). https://doi.org/10.1007/BF00353201

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