Figure 2.

The samples of pure PHB at different scales were collected on the aluminum foil with the following polymer concentrations, die diameter, applied voltages, CF/DMF ratios, flow rate, and distance between the needle and target: 20 wt %, 1.3 mm, 20 kV, 90:10, 0.185 µm·h⁻¹, and 20 cm, respectively. (a,c) at a fixed target (random) with different scales, and (b,d) at a rotating drum with a speed of 1100 rpm.