作　　者： ; ; ; ;

机构地区： 华南理工大学化学与化工学院广东省绿色化学产品技术重点实验室

出　　处： 《化工学报》 2011年第1期248-254,共7页

摘　　要： 以正硅酸乙酯为原料,应用溶胶-凝胶两步催化,甲基丙烯酸基丙基三甲氧基硅烷作为改性剂,无水乙醇为溶剂,共聚法常压下制备疏水性SiO2气凝胶。运用原位红外在线监测反应历程,确定制备工艺步骤。运用N2吸附仪、扫描电镜、红外光谱、TG-DSC对SiO2气凝胶孔径分布、形貌、表面官能团及热稳定性进行分析。结果表明,经甲基丙烯酸基丙基三甲氧基硅烷改性的SiO2气凝胶疏水性能良好,疏水的耐温性可达到407℃,比表面积为877.17m2.g-1,由球形纳米颗粒堆积而成,颗粒尺寸范围在10～50nm,孔径集中分布在1.9～2.5nm,是典型的纳米介孔材料。 The hydrophobic silica aero-gels were prepared by copolymerization under ambient pressure,and sol-gel two-step catalysis.Tetraethoxysilane （TEOS） was used as precursor,methacrylic propenyl trimethoxy silane （KH-570） was used as modifier and ethanol （EtOH） was used as solvent.To establish the reaction mechanism and confirm the preparation process steps,in-situ IR was used to monitor the process on line.The pore size distribution,microstructure,surface functional groups and thermal stability were investigated with SEM,BET,FTIR and TG-DSC.The results showed that silica aero-gels modified with KH-570 exhibited good hydrophobic performance with surface area of 877.17 m^2·g^-1.This material was composed of accumulated spherical nano-particles.The particle size was in the range of 10—50 nm and the pore size was 1.9—2.5 nm.It was typical nano-mesoporous material.

关 键 词： 疏水性 二氧化硅 共聚法 常压干燥

领　　域： [化学工程]