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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 mixturewithdimethyldiethoxysilane, has given encouraging results. Diluting the monomer bearing the amino function could contributeto obtaining a flexible network interpenetrating the fibre network. Due to the complexity of the system, the work presentedhere 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 systemsof dimethyldiethoxysilane for 24 h, but in the presence of water, hydrolysis and exchange were observed, the rate constant ofthe former being higher than that of the latter by one order ofmagnitude. Inmethanol, in the presence of water, condensationleading to dimerization was observed within less than three days, with polycondensation requiring a much longer time. Fromthe rate constantmeasurements, inthepresence of water, it appears that thecondensation reaction is the slowest reaction. It canbe 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 ofaminoalkylalkoxysilane.
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Contributor : Olek Maciejak <>
Submitted on : Monday, June 17, 2019 - 4:39:35 PM
Last modification on : Thursday, February 4, 2021 - 3:29:52 AM

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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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