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柔性SiO2 气凝胶的制备
引用本文:吴文军.柔性SiO2 气凝胶的制备[J].宇航材料工艺,2013,43(4).
作者姓名:吴文军
作者单位:1. 航天材料及工艺研究所,先进功能复合材料技术重点实验室,北京100076
2. 北京化工大学化工资源有效利用国家重点实验室,北京,100029
摘    要:以甲基三乙氧基硅烷为前驱体,通过溶胶-凝胶法和超临界干燥制备块状柔性SiO2气凝胶.研究了前驱体浓度对材料化学组成、微观结构及柔韧性、热稳定性的影响.结果表明,甲基的存在降低了分子网络的交联密度,赋予了材料柔韧性.随着前驱体浓度降低,微观结构中颗粒堆积紧密程度下降,材料的柔韧性增强;同时分子中硅羟基增多,热稳定性提高.

关 键 词:柔性气凝胶  化学组成  微观结构  热稳定性

Preparation of Flexible SiO2 Aerogel
Wu Wenjun , Xiong Gang , Wang Qin , Chen Xiaohong , Hu Zijun.Preparation of Flexible SiO2 Aerogel[J].Aerospace Materials & Technology,2013,43(4).
Authors:Wu Wenjun  Xiong Gang  Wang Qin  Chen Xiaohong  Hu Zijun
Institution:Science and Technology on Advanced Functional Composites Laboratory, Aerospace Research Institute
Abstract:The flexible aerogel monoliths were prepared by the hydrolysis and condensation of methyltriethoxysilane
(MTES),followed by supercritical drying. The influence of concentration of precursor on the chemical composition,
microstructure,flexibility and thermal stability of aerogel were investigated. It is shown that the degree of cross
linking of aerogel molecule, which was prepared by the precursor of MTES and showed excellent flexibility was declined
because of the existence of methyl groups. With the reduction of concentration of precursor, the degree of compactness
of aerogel particles declined, which is responsible for the enhancement in the flexibility of the aerogels, the
number of Si-OH increased and the thermal stability of aerogel exhibited the same tendency.
Keywords:Flexible aerogel  Chemical constitution  Microstructure  Thermal stability
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