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SEM images of KH550-CNC/WPU/PVAL composite fibers prepared at different advancing speeds: (a) 0.0001 mm/s; (b) 0.0002 mm/s; (c) 0.0003 mm/s; and (d) 0.0004 mm/s. The composite fiber diameter distribution was measured using Nano Measurer software at different advancing speeds: (a′) 0.0001 mm/s; (b′) 0.0002 mm/s; (c′) 0.0003 mm/s; and (d′) 0.0004 mm/s.
