无机材料学报

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三嵌段共聚物合成SiO2中孔材料的制备化学

孙继红1; 范文浩1; 章斌1; 吴东1; 孙予罕1; 杨年华2; 周建伟2; 岳勇2   

  1. 中国科学院山西煤炭化学研究所煤转化国家重点实验室, 太原 030001; 2. 中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室, 武汉 430019
  • 收稿日期:1999-03-12 修回日期:1999-05-10 出版日期:2000-02-20 网络出版日期:2000-02-20

Preparation of Mesoporous SiO2 via of Triblock Copolymer

SUN Ji-Hong1; FAN Wen-Hao1; ZHANG Bin1; WU Dong1; SUN Yu-han1; YANG Nian-Hua2; ZHOU Jian-Wei2; YUE Yong2   

  1. 1. State Key Laboratory of Coal Conversion; Institute of Coal Chemistry; Chinese Academy of Sciences; Taiyuan 030001; China; 2. State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Wuhan Insitute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430019, China
  • Received:1999-03-12 Revised:1999-05-10 Published:2000-02-20 Online:2000-02-20

摘要: 采用溶胶一凝胶法,以正硅酸乙酯(TEOS)为前驱体,添加聚氧乙烯醚(PEO)一聚氧丙烯醚(PPO)一聚氧乙烯醚(PEO)共聚物为模板剂制备结构可控的SiO中孔材料,通过BET、TG/DTA、FT-IR、29SiNMR等分析手段,考察了不同条件下溶胶一凝胶制备化学及其热处理对SiO中孔材料结构性质的影响规律和内在本质.结果表明:通过调节聚合度和添加量以及溶胶老化时间,可以对SiO中孔材料织构性质进行有效的调控;同时由于该共聚物在不同气氛温度下的脱除机理不同,从而对材料的结构性质影响也有所不同;经真空热处理后,SiO中孔材料柔性骨架得到加强,孔分布更趋集中.

关键词: SiO2中孔材料, 孔分布, 溶胶-凝胶, 热处理

Abstract: 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.

Key words: mesoporous SiO2, pore distribution, sol-gel, heat-treatment

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