Condensation behavior of a sulane coupling agent in the presence of colloidal silica studied by 29Si and 13C NMR
Condensation behavior of a sulane coupling agent in the presence of colloidal silica studied by 29Si and 13C NMR
复制标题
通过 29Si 和 13C NMR 研究胶体二氧化硅存在下苏烷偶联剂的缩合行为
DOI：
10.1016/0021-9797(88)90319-0
复制
发表时间：
1988
影响因子：
9.9
通讯作者：
K. Horie
中科院分区：
文献类型：
--
作者：
N. Nishiyama;T. Asakura;K. Horie
本文用~（29）Si和~（13）C NMR研究了硅溶胶存在下硅烷偶联剂的水解和缩合反应机理。胶体二氧化硅对反应的影响是加速硅烷偶联剂的甲氧基的水解，并且相反地，减速水解物质的缩合。56天后，在胶体二氧化硅存在下，主要产物是低聚物，尽管当不存在胶体二氧化硅时主要产生聚合物。这些结果可能来自于胶体二氧化硅的酸性特征。
The hydrolysis and condensation mechanisms of a silane coupling agent in the presence of colloidal silica were investigated with29Si and13C NMR. The influence of colloidal silica on the reaction is acceleration of the hydrolysis of the methoxy group of the silane coupling agent and, conversely, deceleration of the condensation of the hydrolyzed species. After 56 days, the main products are oligomeric species in the presence of colloidal silica, although mainly polymeric species are produced when the colloidal silica is absent. These results may derive from the acidic character of the colloidal silica.