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Experimental Design of Si-Ti-Zr Polymers Containing Hybrid Si Species, Spectroscopic Study and Thermal Evolution

Abstract

A Si-Ti-Zr polymeric system containing hybrid Si species was prepared, using Tetraethyl orthosilicate (TEOS) and Methyl triethoxysilane (MTES) as the Si sources. The TEOS-MTES molar ratio was 60-40, respectively. Monomeric Ti and Zr alkoxides were used. The final molar ratios Si-Ti-Zr were 82-7-11, respectively. The samples were characterized by 29Si NMR, SAXS, FTIR and UV-Vis spectroscopies. The NMR results showed that the hybrid Si species were produced to a very low extent and that the kinetics of the polymerization was controlled by Ti and Zr. According to the SAXS results, linear oligomers were obtained. The Si—O—Ti and Si—O—Zr bonds were detected by FTIR. In the latter case, the bonds are stable, as the corresponding vibrations were detected in the oxide calcined at 773 K. A microporous structure was obtained, where the average pore diameter was 1.4 nm.

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Mendez-Vivar, J., Bosch, P., Lara, V. et al. Experimental Design of Si-Ti-Zr Polymers Containing Hybrid Si Species, Spectroscopic Study and Thermal Evolution. Journal of Porous Materials 9, 231–235 (2002). https://doi.org/10.1023/A:1020995103338

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  • DOI: https://doi.org/10.1023/A:1020995103338

  • sol-gel
  • hybrid
  • Si-Ti-Zr
  • spectroscopy
  • surface area
  • microporosity