Fig. 2. Morphology and properties of electrospun WPU/PAM-3 nanofibers under different voltages. (a) SEM image of WPU/PAM-3 nanofibers at 18 kV, showing thicker fibers with less defined pore structure. (b) SEM image of WPU/PAM-3 nanofibers at 20 kV, showing finer, more uniform fibers and a more organized fibrous network. (c) SEM image of WPU/PAM-3 nanofibers at 22 kV. (d) Pore size distribution of WPU/PAM-3 at different voltages. (e) Pore size distribution of WPU/PAM-6 at different voltages. (f) Comparison of porosity for WPU/PAM-3 and WPU/PAM-6 under different voltages. (g) Fiber diameter distribution of WPU/PAM-3 and WPU/PAM-6 at different voltages. (h) Air permeability test results for WPU/PAM-3 and WPU/PAM-6. (i) Stress–strain curves of WPU/PAM-3, WPU/PAM-6, and traditional WPU/PVA electrospun fibers.
