Study on Thermal Conductivities of Aromatic Polyimide Aerogels

• DOI: 10.1021/acsami.6b02183
• Publication Date: 2016-05-05T18:26:15Z
• Authors: Junzong Feng; Xin Wang; Yonggang Jiang; Dongxuan Du; Jian Feng
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Polyimide aerogels for low density thermal insulation materials were produced by 4,4'-diaminodiphenyl ether and 3,3',4,4'-biphenyltetracarboxylic dianhydride, cross-linked with 1,3,5-triaminophenoxybenzene. The densities of obtained polyimide are between 0.081 0.141 g cm(-3), the specific surface areas 288 322 m(2) g(-1). conductivities measured a Hot Disk constant analyzer. value conductivity under carbon dioxide atmosphere is lower than that nitrogen atmosphere. Under pressure 5 Pa at -130 °C, lowest, which 8.42 mW (m K)(-1). have [30.80 K)(-1)], compared to other organic foams (polyurethane foam, phenolic polystyrene foam) similar apparent ambient 25 °C. results indicate aerogel an ideal material aerospace applications.