Influence of Heat Treatment Temperature on the Microstructure Evolution of Poly(vinylborosiloxane) Derived Ceramics
| Autor: | Deepa Devapal, B. Swaminathan, K. J. Sreejith, S. Bhuvaneswari, Srinivas Chinthalapalli, S. Packirisamy |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Vinyltriethoxysilane Polymers and Plastics Diglyme Hydrochloric acid 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences 0104 chemical sciences Catalysis Boric acid chemistry.chemical_compound symbols.namesake chemistry Chemical engineering Materials Chemistry symbols 0210 nano-technology Raman spectroscopy Pyrolysis |
| Zdroj: | Journal of Inorganic and Organometallic Polymers and Materials. 30:2224-2233 |
| ISSN: | 1574-1451 1574-1443 |
| DOI: | 10.1007/s10904-020-01457-1 |
| Popis: | Polycondensation of boric acid and vinyltriethoxysilane in 1:2, 1:1.5 and 1:1 mole ratio in diglyme at 83–87 °C for 3 h using hydrochloric acid as catalyst afforded vinylfunctionalized borosiloxane oligomers soluble in the reaction medium. Complete removal of ethanol, the by-product, and diglyme rendered the oligomers intractable due to the advancement of polycondensation. They were characterized by FTIR and TGA and converted to ceramics by heat treatment at 900 °C, 1500 °C and 1650 °C in argon atmosphere. The ceramics obtained were characterized by IR, Raman, 13C-and 29Si-solid state NMR spectroscopy and XRD. These studies infer the formation of SiOC/SiBOC glass on pyrolysis of these oligomers at 900 °C and onset of formation of β-SiC at 1500 °C. On further heat treatment at 1650 °C, complete conversion of the ceramic to a mixture of α and β-SiC was observed along with the presence of diamond like carbon phases. |
| Databáze: | OpenAIRE |
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