▎ 摘　　要

In this paper, linear-structured polyimide (PI) nanocomposite aerogels were fabricated with incorporation of graphene oxide (GO) and nano-sized zirconium dioxide (ZrO2) via a freeze-drying route. SEM images indicate GO and ZrO2 dispersed well in PI network skeletons after imidization. GO and ZrO2 can improve physical properties not only separately but also synergistically, generating excellent performances of the nanocomposite aerogels with the density of 70 mg cm(-3), porosity of 95%, shrinkage of 19% and thermal conductivity of 0.0266 W m(-1) k(-1). This facile route using rational physical incorporation of nanofillers instead of expensive multi-functional monomers distinctly improves overall performances of the prepared PI nanocomposite aerogels.