Fig. 1: Synthetic route for IWSWN-SPE and structure characterizations.

a Designed route of the IWSWN-SPE. b, c The ¹⁹F and ³¹P ssNMR spectra of the IWSWN-SPE. d TGA curves of PVEC and IWSWN-SPE. e FTIR spectra of the VEC, HFBMA, TAP, and IWSWN-SPE. f AFM images showing the smoothness of the IWSWN-SPE film.