File Name : fig. s1.tif

Caption : fig. s1. ftir spectra of thermal imidization of paa

File Name : fig. s2.tif

Caption : fig. s2. (a) reflection loss (rl)-frequency curves of ppc-700 in the range of 2–18 ghz with absorber thicknesses from 1.8 to 5.5 mm and an absorber content of 30%.
        (b) reflection loss (rl)-frequency curves of ppc -800 in the range of 2–18 ghz with absorber thicknesses from 1.8 to 5.8 mm and an absorber content of 30%.


File Name : fig. s3.tif

Caption : fig. s3. (a)xrd pattern, (b)raman spectrum, (c)complex permittivity and complex permeability, (d)sem image of ppc-800.

File Name : fig.s4.tif

Caption : fig. s4. pore size distribution plots for ppc-700.

File Name : fig. s5.tif

Caption : fig. s5. sem image of ppc-700 membrane’s cross section.