Preparation of Silicon Oxycarbide Composites Toughened by Inorganic Fibers via Pyrolysis of Precursor Siloxane Composites |
| A. Strachotaa, M. Černý b, P. Glogar b, Z. Sucharda b, M. Havelcová b, Z. Chlup c, I. Dlouhý c and V. Kozák c
aInstitute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Heyrovskeho namesti 2, CZ-16200 Praha, Czech Republic bInstitute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, v.v.i., V Holesovickach 41, CZ-182 09, Praha, Czech Republic cInstitute of Physics of Materials of the Academy of Sciences of the Czech Republic, v.v.i., Zizkova 22, CZ-61662 Brno, Czech Republic |
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| The optimization of silicon oxycarbide (SiOC) synthesis (sol-gel/pyrolysis) is described, starting from methyltriethoxysilane, dimethyldiethoxysilane, tetraethoxysilane, ethyltriethoxysilane and propyltriethoxysilane. Variation of final elemental composition was tested via change of monomer ratios and combinations. The main aim was to achieve low weight losses during cure and pyrolysis and high micromechanical properties. Gas chromatography and mass spectroscopy was used to analyse the by-products of cure and pyrolysis, indicating a prominent role of cyclosiloxane and polyhedral oligomeric silsesquioxane (POSS) oligomers. Best results were obtained with high contents of methyltriethoxysilane in the monomers mixture. |
| DOI: 10.12693/APhysPolA.120.326 PACS numbers: 81.05.Je, 81.05.Mh, 82.30.Lp |