三嵌段共聚物合成SiO2中孔材料的制备化学

采用溶胶－凝胶法，以正硅酸乙酯（ＴＥＯＳ）为前驱体，添加聚氧乙烯醚（ＰＥＯ）－聚氧丙烯醚（ＰＰＯ）－聚氧乙烯醚（ＰＥＯ）共聚物为模板剂制备结构可控的ＳｉＯ２中孔材料，通过ＢＥＴ、ＴＧ／ＤＴＡ、ＦＴ－ＩＲ、＾２９ＳｉＮＭＲ等分析手段，

Preparation of Mesoporous SiO2 via of Triblock Copolymer

The mesoporous SiO₂ xerogels with controlled texture were obtained using TEOS as precursor in the presence of Polyethylene Oxide (PEO)- Polypropylene Oxide (PPO)- Polyethylene Oxide (PEO) by sol-gel method. By means of BET, TG/DTA, FT--IR and ²⁹Si NMR analysis, the sol-gel chemistry was investigated and the effects of heat treatment in different conditions were also discussed. The results show that the triblock copolymer molecular chain, additive amount and ageing time of SiO₂ sol can adjust available the texture properties of mesoporous SiO₂, and in different atmospheres, the removed mechanism of such copolymer is different, which results in the different effects on the mesoporous SiO₂. As a result, the mesoporous SiO₂ has stronger flexible skeleton, narrower pore distibution, and higher thermal stability by vacuum heat-treatment.