HYDROLYSIS AND CONDENSATION OF SILICATES - EFFECTS ON STRUCTURE
HYDROLYSIS AND CONDENSATION OF SILICATES - EFFECTS ON STRUCTURE
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DOI：
10.1016/0022-3093(88)90005-1
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发表时间：
1988-03-01
影响因子：
3.5
通讯作者：
BRINKER, CJ
中科院分区：
文献类型：
--
作者：
BRINKER, CJ
综述了溶胶凝胶法中单体烷氧基硅烷和有机烷氧基硅烷的水解和缩合反应。这两个反应都通过酸或碱催化的双分子置换反应进行。在酸催化机理之前，氢氧基或或取代基质子化连接在硅上，而在碱性条件下，羟基或硅烷酸酯阴离子直接攻击硅。许多观察到的结构趋势是根据pH和[H2O]对水解、缩合和溶解反应的依赖来理解的。
The hydrolysis and condensation reactions of monomeric alkoxysilanes and organylalkoxysilanes utilized in sol-gel processing are reviewed. Both reactions occur by acid or base-catalyzed bimolecular displacement reactions. The acid-catalyzed mechanisms are preceded by protonation of OH or OR substituents attached to Si, whereas under basic conditions hydroxyl or silanolate anions attack Si directly. Many of the observed structural trends are understood on the basis of the pH and [H2O] dependence of the hydrolysis, condensation,anddissolution reactions.