Article ID: 130758
Polyimide aerogels containing rigid-rod biphenyl, benzimidazole and triphenylpyridine moieties have been developed. The flexible PI aerogels exhibited excellent thermal stability with glass transition temperatures (Tg) higher than 350 oC. Initial porous structures in the PI aerogels could be maintained even after isothermal aging at 300 oC for 24 h in nitrogen. Furthermore, the weight losses of the aerogels after isothermal aging at 300 oC and 400 oC for 24 h in nitrogen were below 5 wt% and 10 wt%, respectively.
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