Study on Thermal Conductivities of Aromatic Polyimide Aerogels

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• 作者：Junzong Feng ; Xin Wang ; Yonggang Jiang ; Dongxuan Du ; Jian Feng
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：May 25, 2016
• 年：2016
• 卷：8
• 期：20
• 页码：12992-12996
• 全文大小：380K
• 年卷期：0
• ISSN：1944-8252

文摘

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 m² 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 °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 °C. The results indicate that polyimide aerogel is an ideal insulation material for aerospace and other applications.