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.
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 MSUX 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.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2008年第8期1519-1523,共5页
Acta Physico-Chimica Sinica
基金
天津科技大学引进人才启动基金(20070444)
国家自然科学基金(50573006)资助项目
关键词
硅基介孔材料
酸诱导
介观相转变
表面改性
Mesoporous silica material
Acidity-induced
Mesostructure transformation
Surface modification
