| SiO2-PEG凝胶体系织构特性的研究 |
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| 引用本文： | 孙继红,巩雁军,范文浩,吴东,孙予罕.SiO2-PEG凝胶体系织构特性的研究[J].高等学校化学学报,2000,21(1):95-98. |
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| 作者姓名： | 孙继红 巩雁军 范文浩 吴东 孙予罕 |
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| 作者单位： | 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 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，29625307， |
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| 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.
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| 关 键 词： | SiO2-PEG 孔分布 可控结构 溶胶-凝胶 |
| 收稿时间： | 1998-11-27 |
Textural Characterization of SiO2-PEG Xerogels |
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| SUN Ji-Hong,GONG Yan-Jun,FAN Wen-Hao,WU Dong,SUN Yu-Han.Textural Characterization of SiO2-PEG Xerogels[J].Chemical Research In Chinese Universities,2000,21(1):95-98. |
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| Authors: | SUN Ji-Hong GONG Yan-Jun FAN Wen-Hao WU Dong SUN Yu-Han |
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| Institution: | State Key Laboratory of Coal Conversion, Shanxi Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China |
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| Abstract: | The porous SiO_2 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 SiO_2 xerogels. It has been found that the SiO_2 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. |
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| Keywords: | SiO_2-PEG Pore distribution Controlled structure Sol-Gel |
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