Zr-O-Si系アルコキシドの加水分解-重合反応

抄録

A Zr-O-Si alkoxide complex was synthesized and its hydrolysis-condensation reaction was studied using small angle X-ray scattering. Transparent and homogeneous Zr-O-Si alkoxide solutions were formed by reacting Zr(OC₃H₇)₄ with Si(OC₂H₅)₄ hydrolyzed with one mole of water per one mole of Si(OC₂H₅)₄ and HCl catalyst, whereas the solutions hydrolyzed with NH₄OH catalyst or without any catalyst resulted in precipitation of ZrO₂ crystals. Homogeneous Zr-O-Si alkoxide solutions were hydrolyzed with 0 to 8 moles of water to metal alkoxide, whose X-ray scattering curves were analyzed in both power law and Guinier law. The synthesized Zr-O-Si alkoxide consisted of chain like polymers, which were aggregated into three dimensional branched polymers with water content up to 4 moles per 1 mole metal alkoxide and their size increased up to 65Å in the Guinier radius. However, no further changes in size and shape of aggregated polymers were observed with more than 4 moles of water.