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Article

Macromonomers as a Novel Way to Investigate and Tailor Silicon-Oxycarbide-Based Materials Obtained from Polymeric Preceramic Precursors

Faculty of Materials Science and Ceramics, AGH-University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland
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Author to whom correspondence should be addressed.
Academic Editor: Weon Ho Shin
Materials 2021, 14(13), 3703; https://doi.org/10.3390/ma14133703
Received: 29 April 2021 / Revised: 22 June 2021 / Accepted: 28 June 2021 / Published: 2 July 2021
(This article belongs to the Section Structure Analysis and Characterization)
It has been shown that bifunctional monomers (D units), which are used to increase the carbon content in silicon oxycarbide precursors, can form volatile oligomers, thus affecting the amount of carbon available during the transition into the final material in the annealing process. Additionally, an uneven distribution of carbon-rich mers may lead to the formation of a free-carbon phase, instead of the incorporation of carbon atoms into the silicon matrix. In this study, a novel two-step approach was utilized. Firstly, a macromonomer containing a number of structural units with precise structure was synthesized, which was later polycondensed into a ceramic precursor. Chlorodimethylsilane modified 2,4,6,8-tetramethylcyclotetrasiloxane was used as a silicon oxycarbide precursor monomer containing both T and D structural units (i.e., silicon atoms bonded to three and two oxygen atoms, respectively), with well-defined interconnections between structural units. Such a macromonomer prevents the formation of small siloxane rings, and has a very limited number of possible combinations of structural units neighboring each silicon atom. This, after investigation using IR, XRD, TG and elemental analysis, gave insight into the effect of “anchoring” silicon atoms bonded to two methyl groups, as well as the impact of their distribution in comparison to the materials obtained using simple monomers containing a single silicon atom (structural unit). View Full-Text
Keywords: silicon oxycarbide; black glass; macromonomer; sol-gel; preceramic polymer; IR; TG silicon oxycarbide; black glass; macromonomer; sol-gel; preceramic polymer; IR; TG
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MDPI and ACS Style

Owińska, M.; Matoga, P.; Jeleń, P.; Długoń, E.; Handke, B.; Niemiec, W. Macromonomers as a Novel Way to Investigate and Tailor Silicon-Oxycarbide-Based Materials Obtained from Polymeric Preceramic Precursors. Materials 2021, 14, 3703. https://doi.org/10.3390/ma14133703

AMA Style

Owińska M, Matoga P, Jeleń P, Długoń E, Handke B, Niemiec W. Macromonomers as a Novel Way to Investigate and Tailor Silicon-Oxycarbide-Based Materials Obtained from Polymeric Preceramic Precursors. Materials. 2021; 14(13):3703. https://doi.org/10.3390/ma14133703

Chicago/Turabian Style

Owińska, Maria, Paulina Matoga, Piotr Jeleń, Elżbieta Długoń, Bartosz Handke, and Wiktor Niemiec. 2021. "Macromonomers as a Novel Way to Investigate and Tailor Silicon-Oxycarbide-Based Materials Obtained from Polymeric Preceramic Precursors" Materials 14, no. 13: 3703. https://doi.org/10.3390/ma14133703

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