不同改性剂对SiO_(2)气凝胶性能的影响  

Effects of different modifiers on the properties of SiO_(2) aerogels

作　　者：温立玉 张忠伦 侯建业 王明铭 刘振森 Wen Liyu;Zhang Zhonglun;Hou Jianye;Wang Mingming;Liu Zhensen(CNBM Technology Innovation Academy(Shandong)Co.,Ltd.,Zaozhuang 277100;Shandong Key Laboratory of Inorganic Functional Materials and Intelligent Manufacture,Zaozhuang 277000;China Building Materials Academy Co.,Ltd.,Beijing 100024)

机构地区：[1]中建材科创新技术研究院(山东)有限公司,枣庄277100 [2]山东省无机功能材料与智能制造重点实验室,枣庄277000 [3]中国建筑材料科学研究总院有限公司,北京100024

出　　处：《化工新型材料》2024年第S01期358-362,370,共6页New Chemical Materials

基　　金：国家“十四五”重点研发计划项目(2023YFB3812300)。

摘　　要：以正硅酸乙酯(TEOS-28)为硅源,以5种不同的改性剂(甲基三乙氧基硅烷MTES、二甲基二乙氧基硅烷DMDES、三甲基乙氧基硅烷ETMS、三甲基氯硅烷TMCS、六甲基二硅氮烷HMDZ),使用溶胶-凝胶法,通过超临界干燥工艺制备疏水SiO_(2)气凝胶。通过比表面积分析仪、扫描电镜、热重分析仪等多种表征方法,全面揭示了SiO_(2)气凝胶的孔结构、微观形貌和热稳定性等性能。结果表明:改性后的SiO_(2)气凝胶比表面积900~1024m^(2)/g,密度0.092~0.128g/cm^(3),平均孔直径14.67~18.3nm,均显著优于未改性;SEM结果显示孔结构更加均匀,孔隙率更大;疏水性TMCS>HMDZ>ETMS>DMDES>MTES;改性后的SiO_(2)气凝胶的热稳定性更好,其中TMCS和HMDZ改性的热稳定性最好。Using TEOS-28 as the silicon source,five different modifiers(MTES,DMDES,ETMS,HMDZ,TMCS)were used to prepare hydrophobic SiO_(2) aerogels by the supercritical drying process using the solgel method.The pore structure,micro morphology and thermal stability of SiO_(2) aerogels were comprehensively revealed by various characterization methods such as specific surface area analyzer,scanning electron microscope and thermogravimetric analyzer.The results showed that the specific surface area of the modified SiO_(2) aerogel was 900~1024m^(2)/g,the density was 0.092~0.128g/cm^(3) and the average pore diameter was 14.67~18.3nm,which were significantly better than those of the unmodified SiO_(2) aerogels.SEM results indicated that the pore structure was more uniform and the porosity was larger.The hydrophobicity of the aerogels followed the order of TMCS>HMDZ>ETMS>DMDES>MTES.The thermal stability of modified SiO_(2) aerogels was better,among which the thermal stability of TMCS and HMDZ was the best.

关 键 词：SIO 2气凝胶 溶胶-凝胶 疏水性 超临界干燥 

分 类 号：TQ152[化学工程—电化学工业] TM53[电气工程—电器]