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. 2020 Jul 7;12(7):1509. doi: 10.3390/polym12071509

Figure 4.

Figure 4

SEM images of M4, M5 and M6 membranes prepared with PVDF, PVP, PEG and TEP and exposed to humidity for 0, 2.5 and 5 min, respectively. Magnification: top surface 10,000×, cross section 1000×.