以正硅酸乙酯为硅源,乙醇和水为溶剂,芳纶纤维为增强相,通过溶胶凝胶及常压干燥等步骤,实现了芳纶增韧SiO_2气凝胶复合材料的非超临界制备.采用扫描电镜、吸附-脱附等分析手段及热导率测试对所得气凝胶样品进行结构分析和性质表征.结果表明,调节反应体系的各反应参数可以获得具有不同外形、密度及热导率的复合材料;所得气凝胶平均孔径约为10～20 nm,比表面积可达1000 m~2/g,可望在隔热材料等领域得到应用.
A high malleable silica aerogel composite was prepared by acid/base two step sol-gel process in alcohol-water mixed solvents with tetraethoxysilane (TEOS) as precursor, aramid fiber as reinforcement, followed by ambient-dried method. The microstructure and properties were characterized by FESEM, BET and so on. The results indicated that the composites with different density, contour and thermal conductivity can be prepared by changing the reaction parameters. The average pore size of aerogel is 10～20 nm, specific surface area is more than 1000 m~2/g, which is hopeful to be applied in heat insulation field.
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