メチルエトキシシラン及びフエニルエトキシシランの加水分解・縮合反応に及ぼす化学改質金属アルコキシドの触媒的作用

概要

論文の詳細を見る
The catalytic effect of chemically modified metal alkoxides on the hydrolysis and condensation reactions of methylethoxysilanes and phenylethoxysilanes was investigated by 29Si nuclear magnetic resonance spectroscopy and gel permeation chromatography. Metal alkoxides such as Al(0-sec-C_4H_9)_3, Ti(O-iso-C_3H_7)_4 and Nb(OC_2H_5)_5 modified with ethyl acetoacetate accelerated not only the condensation reactions but also the hydrolysis reactions of methyl- and phenyl-alkoxysilanes. The catalytic effect of these metal alkoxides was found to be different between methyl- and phenyl-alkoxysilanes. The catalytic activity increases in the order of Nb< Al < Ti alkoxides in the case of methyl-ethoxysilanes, whereas in the case of phenyl-ethoxysilanes it increases in the order of Nb < Ti < Al alkoxides. The difference in catalytic activity was discussed on the basis of the partial charge of M in metal alkoxide, the difference in electronegativity between M and Si and the difference between the coordination number and valence of M.
社団法人日本セラミックス協会の論文
2003-10-01