SiO_2-C复合气凝胶的制备及其结构  

Preparation and Structural Investigation of SiO_2-C Composite Aerogel

作　　者：叶丽[1] 陈于蓝[1] 韩伟健[1] 冀志宏[1] 赵彤[1] 

机构地区：[1]中国科学院化学研究所,北京100190

出　　处：《宇航材料工艺》2009年第6期19-22,共4页Aerospace Materials & Technology

摘　　要：以间苯二酚(R)和甲醛(F)为碳源,以3-胺丙基三乙氧基硅烷(APTES)为硅源,一步溶胶-凝胶法简单快捷地合成了SiO2-RF复合气凝胶,高温碳化后得到SiO2-C复合气凝胶,并用扫描电镜、比表面分析仪对所得样品的结构进行了研究,并讨论了不同投料比对气凝胶结构的影响。结果表明碳化前,投料比APTES/R=1时,所得气凝胶具有最大的比表面积(SBET=606.1m2/g),碳化后,由于体积收缩和酚醛热解产生新孔隙双重因素的影响,投料比APTES/R=1/2时样品的比表面积达到最大(SBET=704.2m2/g)。SiO2 -RF composite aerogels were prepared by one-step sol-gel method by using resorcinol （R）, formaldehyde （F） and 3-aminopropyhriethoxytsilane （APTES） as starting materials. After carbonization, SiO2 - C composite aerogels were obtained. The structure of the aerogels was characterized by scanning electron microscopy and nitrogen adsorption/desorption analysis. The structure of SiO2 - RF snd SiO2 - C composite aerogels are strongly dependent on the APTES/R molar ratio. When APTES/R = 1, SiO2 - RF composite aerogel has the highest specific surface area SRET （606.1 m2/g）. However, the highest specific surface area SBET （704. 2 m2/g） is obtained when APTES/ R = 1/2 after carbonization for two reason：volume shrinkage and new pore come into being.

关 键 词：SIO2 酚醛 复合气凝胶 

分 类 号：TQ264.12[化学工程—有机化工] TN6[电子电信—电路与系统]