Preparation of ultralight aramid aerogels with high resilience by bubble template method
In the process of liquid-phase assembly of nano materials,bubble templates play a vital role in reducing material density and regulating structure.However,in the liquid-phase assembly process of aromatic polyamide nano fibers,the poor stability of aromatic polyamide nano fibers in stabilizing bubbles makes it difficult to prepare lightweight aromatic polyamide nano fiber aerogels using bubble templates.Therefore,a novel aromatic polyamide nano fiber-based aerogel is introduced.This aerogel,using a small amount of graphene oxide added to the aromatic polyamide nano fiber aqueous dispersion,is prepared using a bubble template-cryogenic freeze-drying method.It exhibits characteristics of high resilience and low density.The addition of graphene oxide at a solid content of 0.126%significantly improves the stability of bubbles,suppressing bubble coalescence rate.The prepared aerogel can fully rebound at 50%compression strain,while the aerogel prepared without graphene oxide shows plastic deformation up to 28%and poor resilience.Additionally,the aromatic polyamide nano fiber-based aerogel has a low density of 9.8 mg/cm3 and demonstrates excellent high-temperature insulation performance.This lightweight,highly resilient aromatic polyamide nano fiber-based aerogel is expected to be applied in fields such as new energy vehicles,military equipments,and aerospace.
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维普
