高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (1): 95.

• 论文 • 上一篇    下一篇

SiO2-PEG凝胶体系织构特性的研究

孙继红, 巩雁军, 范文浩, 吴东, 孙予罕   

  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
  • 收稿日期:1998-11-27 出版日期:2000-01-24 发布日期:2000-01-24
  • 通讯作者: 孙予罕(1962年出生),男,博士,研究员,从事催化化学研究.
  • 基金资助:

    国家杰出青年科学基金(批准号:29625307)资助

Textural Characterization of SiO2-PEG Xerogels

SUN Ji-Hong, GONG Yan-Jun, FAN Wen-Hao, WU Dong, SUN Yu-Han   

  1. State Key Laboratory of Coal Conversion, Shanxi Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
  • Received:1998-11-27 Online:2000-01-24 Published:2000-01-24

摘要: 采用溶胶-凝胶法,以正硅酸乙酯(TEOS)为前驱体,以不同分子量的聚乙二醇(PEG)为改性剂,制备结构可控的多孔SiO2干凝胶.结果表明:PEG限制了TEOS的水解反应,进而对溶胶粒子的表面进行修饰,形成“粒子团-PEG”聚集体及短程有序的环状网络结构,由此对SiO2干凝胶的结构性质进行调控.经真空热处理后,PEG等有机残留物被脱除的同时,SiO2-PEG干凝胶柔性骨架得到加强,孔分布更趋集中,干凝胶结构的热稳定性得到进一步提高.

关键词: SiO2-PEG, 孔分布, 可控结构, 溶胶-凝胶

Abstract: The porous SiO2 xerogels with controlled structure were obtained from TEOS in the presence of PEG by sol-gel method. The results showed that PEG restrained the hydrolysis reaction of TEOS, and then modified the surface of sol particle to form the PEG-clusters (i.e. the ring-like networks in short order). As a result, the addition of PEG could adjust the texture properties of SiO2 xerogels. It has been found that the SiO2 xerogel has a stronger flexible skeleton, narrower pore distribution, and higher thermal stability with the removal of the residue organic(such as PEG and so on) by vacuum heat-treatment.

Key words: SiO2-PEG, Pore distribution, Controlled structure, Sol-Gel

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