Abstract
A hydrolysis-condensation reaction of Al-O-Si alkoxide complex was analyzed by in both the mass fractal dimension and the Guinier radius in small angle X-ray scattering curves. The Al-O-Si alkoxide which was synthesized by reacting Al(OC4H9)3 with hydrolyzed Si(OC2H5)4 consisted of chain-like polymers. When metal alkoxide was hydrolyzed with 0.0082mol of HCl or NH4OH per 1mol metal alkoxide, both the mass fractal dimension and the Guinier radius increased in proportion to an increase in the water content, and reached 2.5 and 80Å, respectively, at 4mol water per 1mol metal alkoxide. Under the HCl catalyst, both the mass fractal dimension and the Guinier radius decreased up to 1.8 and 20Å, respectively, with increasing HCl concentration, indicating that the three-dimensional branched polymers disaggregated into the chain-like polymers. On the other hand, under the NH4OH catalyst, both the mass fractal dimension and the Guinier radius showed the fixed values of 2.5 and 80Å, respectively, irrespective of NH4OH concentration.
