ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00353201
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