We report the design of a new precursor having three branching disiloxane units capable of forming 3D mesostructures with a cubic Pm-3n and its orthorhombic and tetragonal variants Cmmm and P4(2)/mnm, in addition to a conventional 2D hexagonal (p6mm) mesostructure, thus creating a novel research area of mesostructural design in silica-organic nanohybrid materials.
Hydrolysis of higher dialkyldichlorosilanes
作者:K. A. Andrianov、B. A. Izmailov
DOI:10.1007/bf01176029
日期:1967.5
Self-Assembly of Designed Oligomeric Siloxanes with Alkyl Chains into Silica-Based Hybrid Mesostructures
route to ordered silica-organic hybrids using well-defined siloxane oligomers with alkoxy functionality and covalently attached alkyl chains has been investigated. Various hybrid mesostructures were obtained by hydrolysis and polycondensation without the use of any structure-directing agents. The oligomers 1(Cn), having an alkylsilane core and three branched trimethoxysilyl groups, formed highly ordered
已经研究了使用具有烷氧基官能团和共价连接的烷基链的明确定义的硅氧烷低聚物来制备有序二氧化硅-有机杂化物的新型自组装途径。在不使用任何结构导向剂的情况下,通过水解和缩聚获得了各种混合介观结构。具有烷基硅烷核和三个支链三甲氧基甲硅烷基的低聚物 1(Cn) 在 n = 14-18 时形成高度有序的层状相,而那些具有较短烷基链的低聚物形成圆柱形组件,略微扭曲的二维 (2D) 六边形结构( n = 6-10),以及一种新颖的二维单斜结构(n = 12)。此外,具有不同链长的 1(Cn) 的混合物产生了有序的二维六方相,这可能是由于前体更好的堆积。在煅烧以去除有机基团时,由圆柱形组件组成的杂化物被转化为具有可调孔径的有序多孔二氧化硅。1(Cn) 的水解和缩聚过程的液态 29Si NMR 分析揭示了一种独特的分子内反应,主要产生具有四硅氧烷环的低聚物,这是一类具有自组装能力和高交联性的新型两亲分子能力。