Organic-inorganic hybrid materials based on N=C=O functionalised silan modified with titanium and zirconium

• Authors: Yordanka Ivanova , Yanko Dimitriev , Tsvetelina Gerganova , Raina Bryaskova , Maria Fernandes , Isabel Miranda Salvado
• Languages of publication: EN

Abstracts

EN

This work investigates the influence of the precursor trimethylsilil isocyanate on the sol-gel synthesis of hybrid materials. The obtained Si−O−C−N network is additionally modified by titanium and zirconium alcoxypropoxides in the range of 10 to 30 wt. %. The structure of the obtained hybrid materials before and after pyrolysis up to 1100°C was investigated by methods of XRD, FTIR and 29Si MAS NMR. We established that the hybrid structure was stable up to 600°C based on IR study. The structural transformation of the hybrid materials into oxycarbonitrogen system started at 800°C. The network of the hybrids modified by titanium remained stable and amorphous up to the final temperature of the pyrolysis (1100°C) compared to the gels modified by more than 10 wt.% Zr. It was confirmed by XRD analysis that the last mentioned are nanocomposite materials, built from carbooxynitrogen vitreous matrix and ZrO2-nanocrystals (tetragonal). The NMR method verified the presence of heterometallic bonds (Si−O−Ti and Si−O−Zr) and Q4, ZrQ3 or TiQ3, NSiO3 and D structural units in the gels.

Keywords

EN

Sol-gel; synthesis; nanocomposite; isocyanate; silicon oxycarnonitrgoen materials

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2005
• Volume: 3
• Issue: 3
• Pages: 452-469

Dates

published

1 - 9 - 2005

online

1 - 9 - 2005

Contributors

author

Yordanka Ivanova

• Department of Silicate Technology, University of Chemical Technology and Metallurgy, 1756, Sofia, Bulgaria

author

Yanko Dimitriev

• Department of Silicate Technology, University of Chemical Technology and Metallurgy, 1756, Sofia, Bulgaria

author

Tsvetelina Gerganova

• Department of Silicate Technology, University of Chemical Technology and Metallurgy, 1756, Sofia, Bulgaria

author

Raina Bryaskova

• Department of Silicate Technology, University of Chemical Technology and Metallurgy, 1756, Sofia, Bulgaria

author

Maria Fernandes

• Department of Ceramics and Glass Engineering, Aveiro University, 3810-193, Aveiro, Portugal

author

Isabel Miranda Salvado

• Department of Ceramics and Glass Engineering, Aveiro University, 3810-193, Aveiro, Portugal

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Identifiers

DOI

10.2478/BF02479275