

Investigation of hydrolysis and condensation of methyltriethoxysilane in aqueous systems
Jan Kurjata (1,*)



(1) Center of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
(2) Center of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
(3) Center of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
(*) Corresponding Author
Received: 24 May 2013 | Revised: 26 Jun 2013 | Accepted: 26 Jun 2013 | Published: 31 Dec 2013 | Issue Date: December 2013
Abstract
An effective synthesis of methylethoxysilanes and emulsification of methyltriethoxysilane is described. Hydrolysis and condensation products of methyltriethoxysilane were identified and studied using 29Si NMR, mass spectrometry and infrared spectroscopy. The presented analyses are important from practical point of view, as the emulsion in question is used for hydrophobization of building materials and soil. The most striking finding is high stability of the low molecular products of hydrolysis - methylsilanetriol [MeSi(OH)3] and its dimer [(OH)2(Me)SiOSi(Me)(OH)2]. All of which were still present in the aqueous medium, after 40 days of storage at ambient conditions. This finding suggests that condensation processes leading to the formation of polymer network are slow in the emulsion and a large number of reactive hydroxyl groups are present in the system allowing for the effective hydrophobization of mineral material.

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European Journal of Chemistry
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DOI: 10.5155/eurjchem.4.4.343-349.835
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Funding information
National Centre for Science project (N N209 09044), Poland
Citations
[1]. Christoph Rücker, Klaus Kümmerer
Environmental Chemistry of Organosiloxanes
Chemical Reviews 115(1), 466, 2015
DOI: 10.1021/cr500319v

[2]. Tomasz Ganicz, Krystyna Rozga-Wijas
Siloxane-Starch-Based Hydrophobic Coating for Multiple Recyclable Cellulosic Materials
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[3]. Manish K. Mishra, Christian Schöttle, Antony Van Dyk, Kebede Beshah, James C. Bohling, John A. Roper, Clayton J. Radke, Alexander Katz
Wettability Reversal of Hydrophobic Pigment Particles Comprising Nanoscale Organosilane Shells: Concentrated Aqueous Dispersions and Corrosion-Resistant Waterborne Coatings
ACS Applied Materials & Interfaces 11(47), 44851, 2019
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DOI Link: https://doi.org/10.5155/eurjchem.4.4.343-349.835

















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