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Studies on the Hydrolysis and Polycondensation Process of TEOS

Yu Xibing; Wu Hong (Department of Chem Eng. Hefei University of Technology Hefei 230009 China)  
The hydrolysis and polycondensation process of TEOS were studied by taking into measuring of ROH, HOR, Si-OR Si-OH with CC-9A Gas Chromatoraphy, and temperature, pH. The mechanism and reaction rate constants of hydrolysis and condensation on TEOS were first deduced. It was found that: 1)The hydrolyzing rate is quickened with acid as catalyst, but polycondensation rate slows down and polycondensation reaction is Si-OH+HO-S-St-O-St+H2O. 2) Polycondensation rate is quickened, hydrolying rate slows down with base as catalyst and polycondensation reaction is: St-OR+HO-Si-St-O-Si+ROH.
【Fund】: 机械部教育司基金
【CateGory Index】: TQ225.245
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