摘要
以三聚氰胺和甲醛为原料制备MF气凝胶,在凝胶化过程中加入酚类化合物对MF体系进行改性,获得相应的湿凝胶,湿凝胶经超临界干燥,制备出密度为最低可达50 kg.m-3的酚改性MF气凝胶。采用高分辨透射电镜、场发射扫描电镜、红外吸收光谱和热重分析表征了酚改性MF气凝胶的组成、结构以及热性能。结果表明:酚类的引入,MF气凝胶体系由堆积型结构变成链球状多孔纳米结构,同时在较低的温度下(<300℃),体系的热稳定性有所提高。
Phenolic-doped melamine-formaldehyde（MF） aerogels were investigated by adding resorcin to MF sol before the formation of crosslink. The solvents in wet gel were then exchanged with ethanol. After CO2 supercritical drying process, the doped MF areogels were prepared with the lowest density of about 50 kg·m^-3. The samples were also characterized by HRTEM,FESEM, IR absorption spectroscopy and thermogravimetric analyses. The results indicates that the structures of the aerogels are different by changing the mole ratio of melamine to resorcin, and the thermal stability is improved under the temperature of 300℃.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2009年第12期1815-1818,共4页
High Power Laser and Particle Beams
基金
中国工程物理研究院重大基金项目(2008A0302014)
关键词
三聚氰胺-甲醛气凝胶
酚改性
超临界干燥
热稳定性
melamine-formaldehyde aerogel
phenolic doped
supercritical drying
thermal stability
