期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 20, 页码 12992-12996出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b02183
关键词
polyimide aerogels; cross-link; thermal conductivity; supercritical drying; low temperature
资金
- National Natural Science Foundation of China [51172279, 51302317]
- Natural Science Foundation of Hunan Province China [14JJ3008]
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 aerogels are between 0.081 and 0.141 g cm(-3), and the specific surface areas are between 288 and 322 m(2) g(-1). The thermal conductivities were measured by a Hot Disk thermal constant analyzer. The value of the measured thermal conductivity under carbon dioxide atmosphere is lower than that under nitrogen atmosphere. Under pressure of 5 Pa at -130 degrees C, the thermal conductivity is the lowest, which is 8.42 mW (m K)(-1). The polyimide aerogels have lower conductivity [30.80 mW (m K)(-1)], compared to the value for other organic foams (polyurethane foam, phenolic foam, and polystyrene foam) with similar apparent densities under ambient pressure at 25 degrees C. The results indicate that polyimide aerogel is an ideal insulation material for aerospace and other applications.
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