Journal of Materials Science

, Volume 42, Issue 2, pp 595–603

Study of the hydrolysis and condensation of γ-Aminopropyltriethoxysilane by FT-IR spectroscopy


DOI: 10.1007/s10853-006-1138-9

Cite this article as:
Peña-Alonso, R., Rubio, F., Rubio, J. et al. J Mater Sci (2007) 42: 595. doi:10.1007/s10853-006-1138-9


The hydrolysis and condensation reactions of γ-APS have been studied in different acid content aqueous solution by using Fourier Transform infrared (FT-IR) spectroscopy. The hydrolysis of γ-APS under the studied conditions can be followed by the increase of the ethanol band located at 882 cm−1 and the decrease of the band due to the ρ(CH3) of γ-APS molecules located at 959 cm−1. Hydrolysis reaction is faster by increasing both H2O and acid concentrations, and it is completed when 3 moles of H2O per mole of γ-APS are used. The increase of the vibrational band located at 1146 cm−1 shows that condensation of the hydrolysed γ-APS molecules take place forming linear chains in poorly cross-linked structures. Besides, both 8-membered cyclic siloxane formations and poorly cross-linked structures are formed and increase as the water and acid content are increased. On the other hand, highly connected cross-linked structures do not appear due to the steric hindrance of the non-hydrolysable aminopropyl group. The silanol band shows that hydrolysis is faster than condensation except for samples with the lowest H2O content.

Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • R. Peña-Alonso
    • 1
  • F. Rubio
    • 1
  • J. Rubio
    • 1
  • J. L. Oteo
    • 1
  1. 1.Instituto de Cerámica y Vidrio (C.S.I.C.)MadridSpain