Optimization of sol–gel/pyrolysis routes to silicon oxycarbide glasses

Strachota, Adam; Černý, Martin; Chlup, Zdeněk; Šlouf, Miroslav; Hromádková, Jiřina; Pleštil, Josef; Šandová, Hana; Glogar, P.; Sucharda, Zbyněk; Havelcová, Martina; Schweigstillová, Jana; Dlouhý, Ivo; Kozák, Vladislav

doi:10.1016/j.jnoncrysol.2012.06.027

Cited by 25 publications

(19 citation statements)

References 23 publications

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“…It can be attributed to the release of cyclic D-oligomers that formed during the synthesis of ladder-like silsesquioxanes as a by-product. In addition, a mass loss associated with the release of residual solvent and EtOH/ H 2 O from ongoing polycondensation reaction should be observed at this temperature [11,14,21,44]. High impact on loss of mass in this area is the number of D groups in the starting xerogel-it increases with the quantity (Fig.…”

Section: Resultsmentioning

confidence: 93%

“…It is peculiar in a way that we have not observed such extreme effect in the case of other T/D mixtures. It can probably be attributed to the evolution of H 2 and CH 4 from the starting polymer-glass transition process [11,19,26]. Mass loss at approx.…”

Section: Resultsmentioning

confidence: 99%

“…The MTES-CH 3 Si(OCH 3 ) 3 (T units) and DMDES-((CH 3 ) 2 Si(OC 2 H 5 ) 2 ) (D units) were used as a silsesquioxane precursors [11,22,23] 2/1, and 4/1 were synthesized according to the procedure described in our previous papers [7,18,35]. To obtain glassy SiCxOy, dried samples (xerogels) were subsequently heat-treated in a tube furnace at 200, 400, 600, 800, and 1000°C temperature ranges under flowing argon atmosphere.…”

Section: Methodsmentioning

confidence: 99%

“…Many routs can be employed to achieve black glasses [7][8][9][10]. Depending on desired outcome-final product properties, a variety of preceramic materials with different function groups can be used-like methyl, ethyl, and vinyl [11][12][13][14]. Changing the precursor can lead to formation of different black glasses, e.g., materials with or without free carbon phase [5,7,15,35].…”

Section: Introductionmentioning

confidence: 99%

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Thermal evolution of ladder-like silsesquioxanes during formation of black glasses

Jeleń

Szumera

Gawęda

et al. 2017

J Therm Anal Calorim

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Pyrolysis of ladder-like silsesquioxanes in oxygen-free atmosphere leads to the formation of silicon oxycarbides (black glasses). Black glasses are materials of amorphous silica structure where some amount of O 2-ions were replaced by C 4-ions. This exchange leads to local increase in bonds density and therefore improvement in mechanical, thermal, and chemical properties. Thanks to this modification, silicon oxycarbide glasses can be used in a variety of applications like: protective coatings and interconnectors in solid oxide fuel cells. Xerogels were prepared by sol-gel method, and ladder-like silsesquioxanes were used as precursors. Samples were burned at 200-1000°C in inert atmosphere. Structural studies in the middle infrared range (MIR) and SEM with EDX confirmed the presence of SiOC bonds in obtained materials. MIR analysis of solid samples together with TG/dTG measurements allowed defining the process for the formation of black glasses.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal evolution of ladder-like silsesquioxanes during formation of black glasses

Jeleń

Szumera

Gawęda

et al. 2017

J Therm Anal Calorim

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“…Significant weight loss ensued throughout each 400˚C isothermal hold, indicating that this temperature is too low for complete organic volatilization during glass conversion. Water, siloxane oligomers, and gaseous hydrocarbons were likely evolving 73,113 . The slowing and eventual stagnation of weight change in the temperature range of 500 -600˚C indicates that the maximum heat treatment temperature range was optimized for this formulations.…”

Section: Maximizing B Retentionmentioning

confidence: 99%

Boria Effects on the High Temperature Oxidation of Silicon Carbide

McFarland¹

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Preparation of conducting polysiloxane/polyaniline composites

Depa

Strachota

Stejskal

et al. 2015

J of Applied Polymer Sci

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Polysiloxane/polyaniline microcomposites were prepared, in which polyaniline particles act as filler, thus combining the mechanical properties of polysiloxane matrix with conductivity of polyaniline. Two syntheses were evaluated: (1) homogeneous dispersion of a polyaniline colloid in the reaction mixture from which the polysiloxane matrix subsequently formed, and (2) the blending of previously prepared dry polyaniline particles with a liquid oligomeric siloxane resin followed by cure (“heterogeneous method”). Both methods lead to composites with evenly distributed filler. Electrical conductivity was achieved above 40 wt % of polyaniline, which is better obtained by the “heterogeneous” method. During the composite cure, the polyaniline particles, which are softer than the matrix, act as a catalyst and cause more efficient matrix crosslinking, thus leading to somewhat raised moduli. Although particulate fillers usually deteriorate the impact toughness, in the case of the prepared composites, the impact toughness was preserved due to the softer consistence of the filler, which hinders crack propagation. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42429.

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Optimization of sol–gel/pyrolysis routes to silicon oxycarbide glasses

Cited by 25 publications

References 23 publications

Thermal evolution of ladder-like silsesquioxanes during formation of black glasses

Thermal evolution of ladder-like silsesquioxanes during formation of black glasses

Boria Effects on the High Temperature Oxidation of Silicon Carbide

Preparation of conducting polysiloxane/polyaniline composites

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