Abstract
The hydrolysis reactions of 8 different N-bearing alkoxy-silane coupling agents, namely: 3-cyanopropyl triethoxy silane (CPES), triethoxy-3-(2-imidazolin-1-yl) propyl silane (IZPES), and amino silanes, 3-aminopropyl triethoxy silane (APES), 3-aminopropyl trimethoxy silane (APMS), 3-(2-aminoethylamino)propyl trimethoxysilane (DAMS), 3-[2-(2-aminoethylamino)ethylamino] propyl trimethoxysilane (TAMS), 4-amino-3,3-dibutyl trimethoxy silane (ADBMS) and trimethoxy [3-(phenylamino)propyl] silane (PAPMS) were carried out in ethanol/water 80/20 (w/w) solutions in acidic media and followed in situ by 1H-, 13C- and 29Si-NMR spectroscopy. Acidic conditions were selected in order to enhance the formation of silanol and to slow down the self condensation reactions of the hydrolyzed functions. 29Si NMR spectroscopy revealed the formation of intermediate species, particularly the solvolysis of γ-amino silanes by reaction exchange with the alcoholic solvent.
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