Abstract
1H and 29Si NMR were used to measure the concentrations of the various functional groups (alkoxy, silanol and SiOSi bond) in an acid-catalyzed Si(OCH 3) 4(TMOS):CH 3OH:H 2O sol-gel solution. There are three kinds of functional group reactions: hydrolysis, water producing condensation and alcohol producing condensation. The hydrolysis rate constant was found to be greater than 0.2 1/(mol min). The water-producing condensation and alcohol-producing condensation rate constants are 0.006 and 0.001 1/(mol min), respectively. The rate of hydrolysis is much faster than either rate of condensation. Both condensation pathways are significant for typical sol-gel reaction conditions.
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