Title: ZrO₂ nanocomposites from polyzirconosiloxanes

Authors: Yordanka Ivanova, Tsvetelina Gerganova, Yuliya Vueva, Maria Helena Fernandes, Isabel Margarida Miranda Salvado

Addresses: Department of Silicate Technology, University of Chemical Technology and Metallurgy, Blvd. Kliment Ohridski, No. 8, 1756 Sofia, Bulgaria. ' Department of Silicate Technology, University of Chemical Technology and Metallurgy, Blvd. Kliment Ohridski, No. 8, 1756 Sofia, Bulgaria. ' Institute of General and Inorganic Chemistry, Bulgarian Academy of Science, Acad. Georgi Bonchev Str., Bl. 11, 1113 Sofia, Bulgaria. ' Ceramic and Glass Engineering Department CICECO, University of Aveiro, Aveiro, 3810-193, Portugal. ' Ceramic and Glass Engineering Department CICECO, University of Aveiro, Aveiro, 3810-193, Portugal

Abstract: Polyzirconosiloxanes were synthesised trough the hydrolytic co-condensation of tetraethoxysilane (TEOS), methyltriethoxysilane (MTES) and zirconium isopropoxide (ZIP) (Process A) or tetramethoxysilane (TMOS), trimethylsilyl isocyanate (TMSI) and ZIP (Process B). In both processes, ethylacetoacetat was added to provide ethylacetato derivatives of polyzirconosyloxanes. When the obtained hybrids were subjected to heat treatment, the zirconia component crystallises in nano size. The XRD, FTIR and ²⁹Si NMR showed that the crystallisation depends on the random and block sequence in the main chain of the polyzirconosiloxanes derived from Processes A and B, respectively.

Keywords: nanocomposite; polyzirconosiloxanes; oxycarbide glasses; oxycarbonitride glasses; hybrid materials; sol-gel; zirconia; nanocomposites; nanomaterials; nanotechnology.

DOI: 10.1504/IJNM.2010.029932

International Journal of Nanomanufacturing, 2010 Vol.5 No.1/2, pp.152 - 162

Published online: 03 Dec 2009 *

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