双网络疏水SiO_(2)气凝胶的结构调控及隔热性能  

Structural modulation and thermal insulation properties of double network hydrophobic SiO_(2) aerogels

作　　者：孙慧君 刘敬肖 史非[1,2] 肖健彬 SUN Huijun;LIU Jingxiao;SHI Fei;XIAO Jianbin(School of Textile and Material Engineering,Dalian Polytechnic University,Dalian 116034,China;Liaoning Key Laboratory of New Materials and Material Modification,Dalian Polytechnic University,Dalian 116034,China)

机构地区：[1]大连工业大学纺织与材料工程学院,辽宁大连116034 [2]大连工业大学辽宁省新材料与材料改性重点实验室,辽宁大连116034

出　　处：《大连工业大学学报》2025年第2期150-156,共7页Journal of Dalian Polytechnic University

基　　金：国家自然科学基金项目(51778098);辽宁省教育厅基本科研项目(LJKZZ20220067)。

摘　　要：为了提升以正硅酸乙酯(TEOS)为硅源制备的SiO_(2)气凝胶的隔热性能,以TEOS和甲基三乙氧基硅烷(MTES)作为双硅源制备了双网络SiO_(2)气凝胶。通过改变MTES与TEOS摩尔比实现了对双网络结构SiO_(2)气凝胶的骨架结构和孔径的调控,经过结构调控后的SiO_(2)气凝胶的比表面积最高可达876.66m^(2)/g,平均孔径为9.06nm。随着MTES与TEOS摩尔比的增大,双网络SiO_(2)气凝胶的力学性能逐渐增强,其隔热能力先减小后增大,其导热系数最低可达0.026 W/(m·K),并且在红外灯照射下的自制隔热模型的最大温差可以达到35℃。MTES硅源的加入使得双网络SiO_(2)气凝胶的疏水性提高,与水的接触角可达130°。这种兼具优异力学性能和隔热性能的疏水性SiO_(2)气凝胶材料在保温隔热领域具有广泛的应用前景。To improve the thermal insulation properties of SiO_(2)aerogels which prepared using tetraethyl orthosilicate(TEOS)as silicon source,dual-network SiO_(2)aerogels were prepared using TEOS and methyltriethoxysilane(MTES)as dual silicon sources.The skeletal structure and pore size of the SiO_(2)aerogels were modulated by changing the molar ratio of MTES/TEOS.The structure-regulated SiO_(2)aerogel had a specific surface area of up to 876.66 m^(2)/g with an average pore diameter of 9.06 nm,its mechanical properties were gradually enhanced,its thermal insulation ability followed the law of first decreasing and later increasing with the increase of MTES/TEOS molar ratio,and its thermal conductivity could be as low as 0.026 W/(m·K).The maximum temperature difference of the homemade thermal insulation model under the irradiation of infrared lamps could be up to 35℃.The hydrophobicity of the dual network SiO_(2)aerogel was improved by adding MTES silicon source,and the contact angle with water could reach up to 130°.This hydrophobic SiO_(2)aerogel material with excellent mechanical and thermal insulation properties have broad applications in the field of thermal insulation.

关 键 词：SiO_(2)气凝胶 双网络 力学性能 隔热性能 

分 类 号：O613.72[理学—无机化学]