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- W2993030672 abstract "ABSTRACT Polyimide (PI) aerogels with highly aligned tube‐like pores were fabricated by unidirectional ice crystal‐induced self‐assembly method. During this process, the mold bottom contacted with the freezing medium, the aqueous solution of poly(amic acid) (PAA) ammonium salt in the mold was unidirectionally frozen, the ice crystals grew from the bottom to top of PAA ammonium salt (PAS) solution along the freezing direction, which endowed PI aerogels with aligned tube‐like pores after sublimation of ice crystals and thermal imidization of PAS. The obtained aerogels had low densities (0.077–0.222 g cm −3 ) and high porosities (83.8–94.2%) and exhibited anisotropic morphology and properties. Their compression strength in vertical direction (parallel to freezing direction) was higher than that in horizontal direction (perpendicular to freezing direction). Their heat transport in horizontal direction was much slower than that in vertical direction; the aerogels had better thermal insulating property in horizontal direction. This facile approach contributed to prepare new type of PI aerogel materials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48769." @default.
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- W2993030672 date "2019-12-02" @default.
- W2993030672 modified "2023-10-12" @default.
- W2993030672 title "Fabrication and properties of anisotropic polyimide aerogels with aligned tube‐like pore structure" @default.
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- W2993030672 doi "https://doi.org/10.1002/app.48769" @default.
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