氨水浓度对常压制备硅气凝胶片性能的影响  

Effect of Ammonia Hydroxide on the Properties of Monolithic Silica Aerogels Via Ambient Pressure Drying

作　　者：龚惠青[1] 刘跃军[1] 陈洪[2] 刘建国[1] 曾广胜[1] 

机构地区：[1]湖南工业大学包装新材料与技术重点实验室,湖南株洲412007 [2]中南林业科技大学,湖南长沙410004

出　　处：《湖南工业大学学报》2009年第2期28-31,共4页Journal of Hunan University of Technology

基　　金：湖南省环境科技发展基金资助项目(湘材建指[2006]127号)

摘　　要：以甲基三甲氧基硅烷(MTMS)为前驱体,通过溶胶-凝胶法在常压下制备出密度在0.16～0.33g/cm3间的白色疏水型硅气凝胶片。通过傅立叶变换红外光谱(FT-IR)、扫描电镜(SEM)、接触角(OCA)\比表面分析仪(BET)、热重(TG)等对硅气凝胶片的性能和结构进行表征和初步研究。结果表明:在保持MTMS、甲醇与水的物质的量之比一定的情况下,氨水浓度变化对凝胶时间、所得硅气凝胶密度、收缩率和硅气凝胶片的完整性等影响较大。Nano-porous silica aerogel monolithics were prepared by sol-gel process from methyltrimethoxysilane （MTMS） precursor through drying under ambient pressure and temperature, and the densities of the aerogels were between 0.16-0.33 g/ cm^3. The resulting aerogels were characterized by means of FT-IR, SEM, TG and BET. The results show that when keep the molar ratio of MTMS：MeOH：H2O constant, the change of the concentration of ammonia has distinct effect on the properties of silica aerogels, such as gelation time, bulk density, volume shrinkage and monolithicity.

关 键 词：硅气凝胶片 常压干燥 溶胶-凝胶法 氨水 

分 类 号：TQ584.1[化学工程—精细化工]