柔性SiO2气凝胶的制备

宇航材料工艺 , 2013, 43(4): 113-117.

柔性SiO2气凝胶的制备

吴文军 ^1, , 熊刚 ^2, , 王钦 ^3, , 陈晓红 ^4, , 胡子君 ^5,

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

3.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

4.北京化工大学化工资源有效利用国家重点实验室,北京100029

5.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

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 ^1, , Xiong Gang ^2, , Wang Qin ^3, , Chen Xiaohong ^4, , Hu Zijun ^5,

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

3.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

4.北京化工大学化工资源有效利用国家重点实验室,北京100029

5.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

Keywords： Flexible aerogel , Chemical constitution , Microstructure , Thermal stability

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.

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