疏水改性对SiO2气凝胶薄膜性能与结构的影响

材料导报, 2011, 25(10): 92-109.

疏水改性对SiO2气凝胶薄膜性能与结构的影响

曹旗 ^1, , 吴清仁 ^2, , 吴启坚 ^3, , 叶春瑜 ^4, , 赵韵 ^5, , 黄文峰 ^6, , 陈嘉 ^7,

1.华南理工大学材料科学与工程学院,广州510640

2.华南理工大学材料科学与工程学院,广州510640;华南理工大学特种功能材料教育部重点实验室,广州510640

3.华南理工大学材料科学与工程学院,广州510640

4.华南理工大学材料科学与工程学院,广州510640

5.华南理工大学材料科学与工程学院,广州510640

6.华南理工大学材料科学与工程学院,广州510640

7.华南理工大学材料科学与工程学院,广州510640

基金项目: 广东省自然科学基金(011552) 国家自然科学基金(59576027)

关键词： SiO2气凝胶薄膜 , 六甲基二硅胺烷 , 疏水改性 , 物理性能 , 微观结构

Effect of Hydrophobic Modifying on the Properties and Structure of Silica Aerogel Films

以正硅酸乙酯(TEOS)为前驱体,采用溶胶-凝胶法制备SiO2气凝胶薄膜,并以不同体积分数的六甲基二硅胺烷(HMDZ)对SiO2气凝胶薄膜进行了疏水改性研究,采用椭偏仪、FITR、接触角测试仪、SEM和光谱仪等对薄膜的疏水性、微观结构及透光性进行了表征,研究了HMDZ疏水改性对SiO2气凝胶薄膜性能与结构的影响.结果表明,疏水改性后,SiO2胶粒表面的大部分亲水性-OH被疏水基团-CH3所取代,其与水的接触角达159°,疏水性好;SiO2气凝胶薄膜在可见光范围内透光率接近90%,透光性高;其孔隙率为78.8%,密度为0.464g/cm3,骨架颗粒尺寸小于40nm,具有纳米多孔网络结构特性.

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