Condensation of alkoxysilanes in alcoholic media: I. Oligomerization of dimethyldiethoxysilane

Abstract : In the context of the preservation of cultural heritage, the treatment of paper by an aminoalkylalkoxysilane, or its mixturewith dimethyldiethoxysilane, has given encouraging results. Diluting the monomer bearing the amino function could contribute to obtaining a flexible network interpenetrating the fibre network. Due to the complexity of the system, the work presented here begins with a study of dimethyldiethoxysilane condensation under the conditions used for the paper deacidification (alcoholic medium, neutral condition, etc.). No detectable exchange reaction with ethanol was observed in anhydrous systems of dimethyldiethoxysilane for 24 h, but in the presence of water, hydrolysis and exchange were observed, the rate constant of the former being higher than that of the latter by one order ofmagnitude. Inmethanol, in the presence of water, condensation leading to dimerization was observed within less than three days, with polycondensation requiring a much longer time. From the rate constantmeasurements, inthepresence of water, it appears that thecondensation reaction is the slowest reaction. It can be concluded that with freshly prepared dimethyldiethoxysilane solutions in ethanol, thismonomer cannot homopolymerize. The next step will be to determine to what extent it can be integrated into the network formed by the polycondensation of aminoalkylalkoxysilane.
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Submitted on : Monday, June 17, 2019 - 4:39:35 PM
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Véronique Bennevault-Celton, Olek Maciejak, Bernard Desmazières, Hervé Cheradame. Condensation of alkoxysilanes in alcoholic media: I. Oligomerization of dimethyldiethoxysilane. Polymer International, Wiley, 2010, 59 (1), pp.43-54. ⟨10.1002/pi.2687⟩. ⟨hal-02158042⟩

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