Abstract
Polyimide (PI) aerogels cross-linked with a three amino compound tri(3-aminophenyl)phosphine oxide (TAPO) were synthesised by 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), pyromellitic dianhydride (PMDA) and 4,4′-diaminodiphenyl ether (4,4′-ODA) through chemical imidization method. Supercritical CO2 was used for drying the PI gels to fabricate nanoporous aerogels with tunable densities ranging from 0.09 to 0.32 g/cm3, and the specific surface areas between 198 and 340 m2/g. To enhance the thermal stability of the BPDA-ODA-based PI aerogels, PMDA was introduced into the formulating oligomer chain. The results showed that with the increase of PMDA concentration, the 5 wt% thermal degradation temperature of PI aerogels could rise to around 600 °C and the glass transition temperature could increase from 269 to 306 °C, which makes them ideal insulation materials for aerospace and other applications.
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Acknowledgements
This research was financially supported by the National Natural Science Foundation of China (51673005). Also, the authors would like to thank the Key Laboratory of Aerospace Materials and Performance, Beihang University.
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Jiang, Y., Zhang, T., Wang, K. et al. Synthesis and characterization of rigid and thermostable polyimide aerogel crosslinked with tri(3-aminophenyl)phosphine oxide. J Porous Mater 24, 1353–1362 (2017). https://doi.org/10.1007/s10934-017-0377-2
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DOI: https://doi.org/10.1007/s10934-017-0377-2