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. 2023 Aug 8;15(16):3341. doi: 10.3390/polym15163341

Figure 3.

Figure 3

SEM images of porous PI thin films. (a) Sample PPI-M (template: Sample M), (b) Sample PPI-L (template: Sample L) and (c) Sample PPI-SL (template: the mixture of Sample S and Sample L, and the volume fraction of Sample S is 0.206). (d) Dielectric constants of various porous PI thin films. Red open circles: Sample PPI-SL; green open circles: Sample PPI-M; black open circles: Sample PPI-L; black closed circles: non-porous PI thin films. (e) Plots of dielectric constants vs. porosity. Red, green and black open circles are Sample PPI-SL, Sample PPI-M and Sample PPI-L, respectively. Reprinted with permission from Ref. [37].