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Hydrolysis and Condensation of Hydrophilic Alkoxysilanes Under Acidic Conditions

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Abstract

A hydrophilic silane was obtained from the reaction of ethylene carbonate and 3-aminopropyldiethoxymethylsilane. This silane undergoes rearrangement to yield an AB2-type hyperbranched polymer under anhydrous conditions but hydrolyzes and condenses to produce linear siloxanes under acid hydrolysis. The hydrolysis and condensation reactions as a function of time, HCl concentration and water content were studied by 29Si NMR. The compositions of the silanol containing hydrolysis intermediates and the siloxanes condensation products were identified under different conditions. The instantaneous composition was found to depend on the specific combination of the acid and the water. Under certain conditions the intermediate silane-diols were stable and did not condense even under mild acidic conditions.

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Authors and Affiliations

  1. Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI, 48824, USA

    Xiangke Shi, Daniel Graiver & Ramani Narayan

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  1. Xiangke Shi
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  2. Daniel Graiver
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  3. Ramani Narayan
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Correspondence to Ramani Narayan.

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Shi, X., Graiver, D. & Narayan, R. Hydrolysis and Condensation of Hydrophilic Alkoxysilanes Under Acidic Conditions. Silicon 4, 109–119 (2012). https://doi.org/10.1007/s12633-012-9108-0

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  • DOI: https://doi.org/10.1007/s12633-012-9108-0

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