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Proceeding Paper

Synthesis of Preceramic Organomagnesium Oxanealumoxane Siloxanes †

by
Galina Shcherbakova
* and
Anastasiya Pokhorenko
SSC RF JSC “State Research Institute for Chemistry and Technology of Organoelement Compounds”, 38 Entuziastov Highway, 105118 Moscow, Russia
*
Author to whom correspondence should be addressed.
Presented at the 23rd International Electronic Conference on Synthetic Organic Chemistry, 15 November–15 December 2019; Available online: https://ecsoc-23.sciforum.net/.
Proceedings 2019, 41(1), 52; https://doi.org/10.3390/ecsoc-23-06466
Published: 14 November 2019

Abstract

Organomagnesiumoxane alumoxane siloxane oligomers with different Al:Mg and Al:Si molar ratio have been synthesized through ethylacetoacetate alkoxyhydroxyalumoxane oligomers co-condensation with magnesium acetylacetonate and oligoethoxysiloxanes in organic solvents (alcohol, toluene) at a temperature of 70–100 °С within 3–6 h with the following solvent distillation. The physicochemical properties of the synthesized oligomers were studied. It is shown that with a molar ratio of Al:Mg ≈ 2 and Al:Si ≈ 1, oligomers have fiber-forming properties. The process of thermotransformation of organomagnesiumoxane alumoxane siloxanes into ceramic phases is investigated. It is found that pyrolysis results in the formation of multicomponent ceramics based on magnesium, aluminum, and silicon oxides, in particular, ceramics with a composition close to that of cordierite 2MgO·2Al2O3·5SiO2 (Mg2Al4Si5O18) or a mixed composition: magnesium-aluminum spinel and mullite. Therefore, the synthesized organomagnesiumoxane alumoxane siloxanes are preceramic oligomers and can be used as precursors for the preparation of various components (binders, impregnating compositions, fibers, ceramic powders) of high-purity ceramic composites based on magnesium, aluminum and silicon oxides.
Keywords: organomagnesiumoxane alumoxane siloxane; oligomers; synthesis; thermal transformation; cordierite; spinel; mullite organomagnesiumoxane alumoxane siloxane; oligomers; synthesis; thermal transformation; cordierite; spinel; mullite

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MDPI and ACS Style

Shcherbakova, G.; Pokhorenko, A. Synthesis of Preceramic Organomagnesium Oxanealumoxane Siloxanes. Proceedings 2019, 41, 52. https://doi.org/10.3390/ecsoc-23-06466

AMA Style

Shcherbakova G, Pokhorenko A. Synthesis of Preceramic Organomagnesium Oxanealumoxane Siloxanes. Proceedings. 2019; 41(1):52. https://doi.org/10.3390/ecsoc-23-06466

Chicago/Turabian Style

Shcherbakova, Galina, and Anastasiya Pokhorenko. 2019. "Synthesis of Preceramic Organomagnesium Oxanealumoxane Siloxanes" Proceedings 41, no. 1: 52. https://doi.org/10.3390/ecsoc-23-06466

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