常压干燥制备疏水性SiO_2~-玻璃纤维复合气凝胶及表征
Preparation and Characterization of Hydrophobic SiO_2~-glass Fibers Aerogels via Ambient Pressure Drying
查看参考文献21篇
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文摘
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以正硅酸乙酯(TEOS)和甲基三乙氧基硅烷(MTES)为复合硅源,玻璃纤维为增强体,采用溶胶-凝胶和常压干燥工艺制备出疏水性SiO_2~-玻璃纤维复合气凝胶。利用N_2吸附脱附、扫描电镜、高分辨透射电镜、红外光谱、接触角、热重-差热分析及力学测试等手段表征复合气凝胶,并分析预处理玻璃纤维时的盐酸浓度及浸泡时间对复合气凝胶密度的影响。结果表明:当玻璃纤维的预处理条件为2.5mol/L盐酸浸泡0.5h时,制备得到的SiO_2~-玻璃纤维复合气凝胶表观密度最低,为0.12g/cm~3,孔径主要分布在2~50nm,疏水角为142°,热稳定性温度高达500℃,抗压强度为0.05MPa,弹性模量为0.5MPa。 |
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其他语种文摘
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Hydrophobic SiO_2~-glass fibers aerogels were prepared by sol-gel process with tetraethoxysiliane(TEOS) and methyltriethoxysilane (MTES) as the silica source,glass fibers as reinforcement, followed by ambient pressure drying.The physical properties and microstructure of silica aerogels were characterized by nitrogen adsorption/desorption tests,Fourier transform infrared spectroscopy, thermogravimetric and differential thermal analysis,scanning electron microscopy,high resolution transmission electron microscopy,contact angle measurement and mechanical testing.The influences of acid concentration and soaking time during pretreatment of glass fibers on the densities of SiO_2~- glass fibers aerogels were investigated.The results show that when the pretreatment condition of glass fibers is soaking 0.5 hat 2.5 mol/L hydrochloric acid,the obtained monolithic SiO_2~ -glass fibers aerogels exhibit the lowest density of 0.12g·cm~(-3) and pore size is in the range of 2-50 nm,the water contact angle is 142°,the thermal stability temperature reaches 500℃,the compressive strength is 0.05 MPa,and the elastic modulus is 0.5 MPa. |
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来源
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材料工程
,2015,43(8):31-36 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2015.08.006
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关键词
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SiO_2气凝胶
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玻璃纤维
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常压干燥
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地址
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1.
厦门大学材料学院材料科学与工程系, 福建省特种先进材料重点实验室, 福建, 厦门, 361005
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厦门大学萨本栋微米纳米技术研究院, 福建, 厦门, 361005
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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物理学 |
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基金
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国家自然科学基金资助项目
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厦门大学中央高校基本科研业务费专项基金
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中国航空科学基金
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福建省高等学校新世纪优秀人才支持计划资助项目(2013)
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福建省自然科学基金
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福建省厦门市科技计划项目
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文献收藏号
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CSCD:5491253
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