块状纤维素-SiO_2复合气凝胶的常压制备及其表征  

Preparation and Characterization of Bulk Cellulose-SiO_2 Composite Aerogel Dried under Ambient Pressure

作　　者：石建军[1] 卢凌彬[1] 郭万涛[1] 张良伟[1] 

机构地区：[1]海南大学材料与化工学院热带岛屿资源先进材料教育部重点实验室,海南海口570228

出　　处：《广东化工》2013年第8期5-7,共3页Guangdong Chemical Industry

基　　金：海南省重大科技研发专项(NO:ZDZX20100009);海南大学青年基金(NO:Qnjj1235);海南省自然科学基金项目(NO:512113)

摘　　要：利用NaOH/硫脲/H2O体系作为溶剂,通过对正硅酸乙酯(TEOS)水解-缩聚反应速率的调控,采用浸泡法获得了纤维素-SiO2复合水凝胶。在水凝胶的干燥过程中,采用乙醇溶剂替换和TEOS溶液浸泡、陈化的方法,制备了纤维素-SiO2复合气凝胶。TEOS水解pH=3、缩聚反应氨水用量为8 mL时,SiO2复合效率最高。在复合气凝胶的结构中,TEOS以SiO2球状颗粒及硅凝胶层的形式与纤维素气凝胶复合。研究为块状纤维素-SiO2复合气凝胶提供了一种有效、简单的制备方法。Cellulose-SiO2 composite hydrogel was prepared by combining the NaOH/thiourea/H20 solvent system, and the immersion method with controlling the hydrolysis-fasculation reaction speed of tetraethyl orthosilicate （TEOS）. Cellulose-SiO2 composite aerogel was prepared by using the method of solvent displacement with alcohol and immersing with TEOS in the process of drying. When the hydrolysis pH was 3 and the volume of ammonia liquor was 8 mL, the composited efficiency of SiO2 was the highest. After composite of SiO2, the hydrophilicity of cellulose aerogel was reduced. In the structure of composite aerogel, TEOS was composited with cellulose in the shape of SiO2 spherical particle and silica aerogel layer. This work provided a effective and simple preparation method for bulk cellulose-SiO2 composite aerogel.

关 键 词：SIO2 纤维素气凝胶 复合材料 溶剂置换 酸碱催化剂 

分 类 号：TB324[一般工业技术—材料科学与工程]