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

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Abstract

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.

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Acknowledgement

The authors are grateful to the Comisión Interministerial de Ciencia y Tecnología (CICYT) of Spain for financial support of this work under project MAT2002-03891.

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  1. Instituto de Cerámica y Vidrio (C.S.I.C.), C/ Kelsen, s/n. Campus Cantoblanco, Madrid, 28049, Spain

    R. Peña-Alonso, F. Rubio, J. Rubio & J. L. Oteo

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  1. R. Peña-Alonso
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  2. F. Rubio
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  3. J. Rubio
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  4. J. L. Oteo
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Correspondence to R. Peña-Alonso.

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Peña-Alonso, R., Rubio, F., Rubio, J. et al. Study of the hydrolysis and condensation of γ-Aminopropyltriethoxysilane by FT-IR spectroscopy. J Mater Sci 42, 595–603 (2007). https://doi.org/10.1007/s10853-006-1138-9

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