“…Meanwhile, the signal near 170 ppm can be attributed to carbonyl groups on the polyimide backbone 39 and the chemical shift observe at 109.8 ppm are arise from the carbon on C-F units. 42 , 43 In addition, the wide peak at 19–64 ppm belongs to the carbon atom of methylene on the crosslinker which further verify the crosslinking between the polymer chain to form the totally insoluble HCPs solid. In order to better applied in practice, stability of the PIHCPs in acidic, alkaline and organic reagents have also been evaluated.…”