Abstract
The hydrolysis-condensation reaction of ZrOSi alkoxide complexes was studied using small angle X-ray scattering measurements.ZrOSi alkoxide complexes containing up to 30 mol% ZrO 2 were synthesized by reacting Zr(OC 3H 7) 4 with Si(OC 2H 5) 4 hydrolyzed with 1 mol H 2O per 1 mol Si(OC 2H 5) 4 and HCl catalyst. The synthesized ZrOSi alkoxides comprised chainlike polymers, in which the Zr atom was bonded with two siloxane polymers. The mass fractal dimension increased proportionally to an increase in the H 2O/metal alkoxide molar ratio, indicating the alkoxides form aggregates of three-dimensional branched polymers. The Guinier increased to 80 Å with an increase in both water and Zr(OC 3H 7) 4. No difference of condensation mechanism was observed from the acidity or basicity of the catalyst.
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