About: Optimization of sol-gel/pyrolysis routes to silicon oxycarbide glasses

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Description	The optimization of the synthesis of silicon oxycarbide ceramics via the sol–gel/pyrolysis route is described, starting from several alkylalkoxysilanes and vinylalkoxysilanes. The main aim was to achieve low weight losses during cure and pyrolysis and also a compact ceramics morphology. The theoretical composition of the pyrolysates was changed between SiO1.5C and SiO1.2C2.3, by varying monomer types and ratios. An assessment of the real composition was performed using energy-dispersive X-ray spectroscopy. The smallest weight losses were obtained for the resins based on vinyltriethoxysilane and dimethyldiethoxysilane which were additionally modified by the addition of a small amount of boric acid. Somewhat higher weight losses combined with the best toughness were found for resins based on non-vinylated silsesquioxane with a low content on linear dimethylsiloxane units. As an alternative, a precursor (SiO0.9C2.8) was prepared via hydrosilylation, based on cyclic dimethylsiloxane oligomers interconnected to a network, but its weight losses were higher than those of sol–gel silicon oxycarbide. The optimization of the synthesis of silicon oxycarbide ceramics via the sol–gel/pyrolysis route is described, starting from several alkylalkoxysilanes and vinylalkoxysilanes. The main aim was to achieve low weight losses during cure and pyrolysis and also a compact ceramics morphology. The theoretical composition of the pyrolysates was changed between SiO1.5C and SiO1.2C2.3, by varying monomer types and ratios. An assessment of the real composition was performed using energy-dispersive X-ray spectroscopy. The smallest weight losses were obtained for the resins based on vinyltriethoxysilane and dimethyldiethoxysilane which were additionally modified by the addition of a small amount of boric acid. Somewhat higher weight losses combined with the best toughness were found for resins based on non-vinylated silsesquioxane with a low content on linear dimethylsiloxane units. As an alternative, a precursor (SiO0.9C2.8) was prepared via hydrosilylation, based on cyclic dimethylsiloxane oligomers interconnected to a network, but its weight losses were higher than those of sol–gel silicon oxycarbide. (en)
Title	Optimization of sol-gel/pyrolysis routes to silicon oxycarbide glasses Optimization of sol-gel/pyrolysis routes to silicon oxycarbide glasses (en)
skos:prefLabel	Optimization of sol-gel/pyrolysis routes to silicon oxycarbide glasses Optimization of sol-gel/pyrolysis routes to silicon oxycarbide glasses (en)
skos:notation	RIV/67985891:_____/12:00381149!RIV13-GA0-67985891
http://linked.open...avai/predkladatel	Ústav struktury a mechaniky hornin AV ČR, v. v. i.
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA106/09/1101), Z(AV0Z20410507), Z(AV0Z30460519), Z(AV0Z40500505)
http://linked.open...iv/cisloPeriodika	20
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Havelcová, Martina Sucharda, Zbyněk Černý, Martin Soukupová, Jana Glogar, Petr
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav struktury a mechaniky hornin AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	156984
http://linked.open...ai/riv/idVysledku	RIV/67985891:_____/12:00381149
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	silicon oxycarbide; siloxane; pyrolysis (en)
http://linked.open.../riv/klicoveSlovo	silicon oxycarbide siloxane pyrolysis
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[E00C434DC3C4]
http://linked.open...i/riv/nazevZdroje	Journal of Non-Crystalline Solids
http://linked.open...in/vavai/riv/obor	JI
http://linked.open...ichTvurcuVysledku	5 (xsd:int)
http://linked.open...cetTvurcuVysledku	13 (xsd:int)
http://linked.open...vavai/riv/projekt	Development of new matrix types based on pyrolysed resins for composites reinforced with ceramic fibres
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	358
http://linked.open...iv/tvurceVysledku	Chlup, Zdeněk Dlouhý, Ivo Havelcová, Martina Sucharda, Zbyněk Černý, Martin Šlouf, Miroslav Pleštil, Josef Strachota, Adam Kozák, Vladislav Schweigstillová, Jana Glogar, Petr Hromádková, Jiřina Šandová, Hana
http://linked.open...ain/vavai/riv/wos	000309647400008
http://linked.open...n/vavai/riv/zamer	Physical properties of advanced materials in relation to their microstructure and processing Research into the properties of geomaterials, development of methods of their ecological exploitation and interpretation of geodynamic processes Progresivní makromolekulární materiály a supramolekulární systémy: syntéza a studium vlastností, jevů a možností využití pro speciální aplikace a moderní technologie
issn	0022-3093
number of pages	12 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.jnoncrysol.2012.06.027
is http://linked.open...avai/riv/vysledek of	Optimization of sol-gel/pyrolysis routes to silicon oxycarbide glasses

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