Integrated manufacturing of REciclable multi-material COmposites for the TRANSport sector

PI aerogel composite was synthesized from 3,3?,4,4?? biphenylteracarboxylic dianhydride (BPDA), 4,4??Oxidianiline (ODA), and polyurethane fiber. The composite material was composed of PI aerogel as matrix and fiber as skeleton. The composite exhibited excellent thermal insulation, ultra?low shrinkage (3.52%), hydrophobic feature (water contact angle: 120°), and favorable thermal stability (Tmax: 517°C).AbstractPolyimide PI aerogels possess a rather potential in thermal protection material for aircraft, owing to their low thermal conductivity, high thermal stability, and low bulk density. However, the large shrinkage of pure PI aerogels is still a challenge in the complete preparation process. Herein, a kind of PI hybrid aerogel composite was prepared successfully by introducing polyurethane fiber as the reinforcing agent. The aerogel composite could realize the enhancement for the pure PI aerogels from a micro/macroscopic perspective, ultimately ensuring the ultralow shrinkage rate of 3.52%. Due to the inhibition of the shrinkage characteristic, the aerogel composite obtained achieved excellent thermal insulation, especially retaining a low temperature of 40.7°C despite the hot surface temperature reached up to 150°C. Besides, the lightweight low?density, exceptional flame resistance, and self?extinguishing properties were reflected from PI hybrid aerogel composite constructed, including the outstanding hydrophobic feature (water contact angle of 120°). The PI hybrid aerogel composite as prepared may be used for the thermal management of aircraft in a great measure, illustrating the feasible strategy of fabricating PI?based aerogel composites.

» Publication Date: 23/05/2024

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