【摘要】 采用两步法以三嵌段共聚物P104(PEO27-PPO61-PEO27)为模板剂合成介孔材料,研究了介孔材料结构随体系pH值的变化,探讨了体系中介观相转变的机理.研究表明,随着pH的升高,发现体系中无机物种和模板剂所组成的介观相发生了转变,由P6mm的SBA-15(pH=1.51-2.67)2D六角孔道结构转变为3D蠕虫状孔道的MSU-X(pH=3.93-4.56)结构.对所得的两种不同种类的硅基材料以γ-胺丙基三乙氧基硅烷(APTES:NH2(CH2)3Si(C2H5O)3)进行表面烷基化改性结果表明,在同样的条件下,经过改性后MSU-X类介孔材料孔壁上接枝的烷基数目要远超过SBA-15类介孔材料.更多还原

【Abstract】 Highly ordered mesoporous silica materials were synthesized by templating with a nonionic triblock copolymer (Pluronic P104(PEO27-PPO61-PEO27)) via a two-step pathway in mildly acidic conditions. The mechanism of this transformation was also investigated. It was found that a mesostructure transformation could be induced by adjusting acidity from the SBA-15 type 2-dimentional hexagonal channel mesostructure (pH=1.51-2.67) to the MSU-X type with 3-dimentional worm-like mesostructure (pH=3.93-4.56) in the same synthetic system. After modified by γ-(aminopropyl) triethoxysilane (APTES) under the same condition, it was indicated that the MSU-X type was more easily modified by APTES than SBA-15 type.更多还原