Chapter 124. Novel Silyl-Carbodiimide Gels for the Preparation of Si/C/(N) Ceramics

  1. Prof. Norbert Auner2 and
  2. Prof. Johann Weis3
  1. Edwin Kroke,
  2. Andreas O. Gabriel,
  3. Dong Seok Kim and
  4. Ralf Riedel

Published Online: 28 APR 2008

DOI: 10.1002/9783527619917.ch124

Organosilicon Chemistry IV: From Molecules to Materials

Organosilicon Chemistry IV: From Molecules to Materials

How to Cite

Kroke, E., Gabriel, A. O., Kim, D. S. and Riedel, R. (2000) Novel Silyl-Carbodiimide Gels for the Preparation of Si/C/(N) Ceramics, in Organosilicon Chemistry IV: From Molecules to Materials (eds N. Auner and J. Weis), Wiley-VCH Verlag GmbH, Weinheim, Germany. doi: 10.1002/9783527619917.ch124

Editor Information

  1. 2

    Inst. für Anorganische Chemie, der Universität Frankfurt, Marie-Curie-Strasse 11, D-60439 Frankfurt am Main, Germany, Phone: 0 69/7 98-29180, -29591, Fax: 069/798-29188

  2. 3

    Wacker-Chemie GmbH, Geschäftsbereich S, Werk Burghausen, Johannes-Hess-Strasse 24, D-84489 Burghausen, Germany

Author Information

  1. Fachgebiet Disperse Feststofle Fachbereich Materialwissenschaft Technische Universität Darmstadt Petersenstraße 23, D-64287 Darmstadt, Germany Tel.: Int. code + (6151)166345—- Fax: Int. code + (6151)166346

Publication History

  1. Published Online: 28 APR 2008
  2. Published Print: 17 JAN 2000

ISBN Information

Print ISBN: 9783527298549

Online ISBN: 9783527619917

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Keywords:

  • sol-gel;
  • ceramics;
  • carbodiimides;
  • polymers;
  • pyrolysis

Summary

The sol—gel process based on alkoxysilanes has been used extensively to prepare oxide glasses and ceramics. Several attempts to apply analogous sol—gel synthesis routes to non-oxide materials were only partially successful. Recently we have found that several di- and trichlorosilanes like MeRSiCl2 (R = -H, -SiCl2Me, -CH2CH2SiCl2Me) or RSiCl3 (R = -H, -C1, -Me, -Ph, -SiC13, -CH2CH2SiCl3), and other silanes as well as silane mixtures react with bis(trimethylsilyl)carbodiimide (Me3si-C[DOUBLE BOND]N-SiMe3) to form polymeric organosilicon gels. Usually no solvent is required and pyridine is used as a catalyst. The highly cross-linked gels are prepared at 20–60°C. In very few cases the sol-gel transition is reversible. Insoluble colorless xerogels are obtained by evaporation of the liquid phase. Heat treatment transforms these polymers into ceramic materials in the ternary Si/C/(N) system.