Preparation and characterization of phenolic-melamine-formaldehyde composite aerogel

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·-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 ℃.