FIG 8(a). SEM image of fiber structure by electrospinning a soft TPU solution at 15% concentration. [H.-Y. Mi, X. Jing, B.R. Jacques, L.-S. Turng, and X.-F. Peng: Characterization and properties of electrospun thermoplastic polyurethane blend fibers: Effect of solution rheological properties on fiber formation. p. 2339.]