Nobuko Oikawa

Near-Infrared Spectroscopic Study for the Sol-Gel Reaction Using Alkoxysilanes

Near-Infrared spectroscopic studies on varying water contents in the sol-gel system using methyltriethoxysilane and tetraethoxysilane were performed. Water and silanol were clearly distinguished from alcoholic OH groups in the spectra. The change of water and silanol contents in acetone or 2-butanone was larger than those in alcoholic solvents. 1H nuclear magnetic resonance spectroscopic measurement showed that hydrolysis and condensation reaction in methanol is faster than those in 2-butanone.