Preparation of silicon oxycarbide composites toughened by inorganic fibers via pyrolysis of precursor siloxane composites

0362897 - ÚMCH 2012 RIV PL eng J - Journal Article
Strachota, Adam - Černý, Martin - Glogar, Petr - Sucharda, Zbyněk - Havelcová, Martina - Chlup, Zdeněk - Dlouhý, Ivo - Kozák, Vladislav
Preparation of silicon oxycarbide composites toughened by inorganic fibers via pyrolysis of precursor siloxane composites.
Acta Physica Polonica A. Roč. 120, č. 2 (2011), s. 326-330. ISSN 0587-4246. E-ISSN 1898-794X.
[Annual Conference /12./ YUCOMAT 2010. Herceg Novi, 06.09.2010-10.09.2010]
R&D Projects: GA ČR GA106/09/1101
Institutional research plan: CEZ:AV0Z40500505; CEZ:AV0Z30460519; CEZ:AV0Z20410507
Keywords : silicon oxycarbide * SiOC * siloxane
Subject RIV: JI - Composite Materials
Impact factor: 0.444, year: 2011
http://przyrbwn.icm.edu.pl/APP/PDF/120/a120z2p25.pdf

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.
Permanent Link: http://hdl.handle.net/11104/0199072