Zr-O-Si系アルコキシドの加水分解-重合反応

概要

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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(OC_3H_7)_4 with Si( OC_2H_5)_4 hydrolyzed with one mole of water per one mole of Si(OC_2H_5)_4 and HCl catalyst, whereas the solutions hydrolyzed with NH_4 OH catalyst or without any catalyst resulted in precipitation of ZrO_2 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 I mole metal alkoxide and their size increased up to 65 Å in the Guinier radius. However, no further changes in size and shape of aggregated polymers were observed with more than 4 moles of water.
社団法人日本セラミックス協会の論文
1988-09-01