Preparation of sol-gel hybrid materials from gamma-methacryloxypropyltrimethoxysilane and tetramethyl orthosilicate: study of the hydrolysis and condensation reactions Articles uri icon

authors

  • El Hadad, Amir Abdelsami
  • CARBONELL BOIX, DIOGENES JOSE
  • BARRANCO, VIOLETA
  • JIMENEZ MORALES, ANTONIA
  • CASAL, BLANCA
  • GALVAN SIERRA, JUAN CARLOS

publication date

  • December 2011

start page

  • 1875

end page

  • 1883

issue

  • 17-18

volume

  • 289

International Standard Serial Number (ISSN)

  • 0303-402X

Electronic International Standard Serial Number (EISSN)

  • 1435-1536

abstract

  • Organic&-inorganic hybrid materials suitable for the development of sol&-gel coatings for metallic surfaces were prepared by hydrolysis and condensation of gamma-methacryloxypropyltrimethoxysilane (MAPTMS) and tetramethyl orthosilicate (TMOS). The hydrolysis of MAPTMS/TMOS was carried out in an ethanol/water solution. The prehydrolysis stage of MAPTMS/TMOS system was monitored by Fourier transform infrared spectroscopy (FTIR) and liquid-state 29Si and 13C nuclear magnetic resonance (29Si and 13C NMR). FTIR analysis indicated that the hydrolysis of MAPTMS/TMOS was accomplished as far as the (SiOMe) band corresponding to unhydrolyzed silane disappeared. The concentration of the alkoxy groups and the extent of self-condensation of mono-, di-, and trisubstituted siloxanes (T species) in the sol were estimated by using liquid-state 29Si NMR spectroscopy. The hydrolysis of the prepared sol was also evaluated by liquid-state 13C NMR spectroscopy. The results indicated that under the adopted synthesis strategy conditions, the hydrolysis process requires 4 h to be completed.

keywords

  • sol-gel; silica; organic-inorganic materials; organopolysiloxane precursors; si-29 and c-13 nmr; ftir; structural characterization