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化工学报  2015 

通过控制醇凝胶强度常压制备低密度疏水SiO2气凝胶

DOI: 10.11949/j.issn.0438-1157.20150057, PP. 4281-4287

Keywords: 气凝胶,压缩模量,常压干燥,二氧化硅,纳米材料

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Abstract:

常压干燥制备低密度气凝胶是促进高性能气凝胶发展应用的重要途径。以正硅酸乙酯为硅源,采用溶胶-凝胶和常压干燥工艺制备出低密度(<100kg·m-3)的疏水SiO2气凝胶,通过工艺参数的控制制备出不同压缩模量的醇凝胶,探讨了反应物配比对醇凝胶压缩模量和气凝胶密度间的影响关系,获得了通过控制醇凝胶压缩模量制备低密度疏水SiO2气凝胶的方法;发现将醇凝胶压缩模量控制在0.25~2.5kPa范围内,可制备出密度小于100kg·m-3的疏水SiO2气凝胶,该研究可以为低密度疏水SiO2气凝胶的低成本常压制备及其控制方法提供指导。

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