Fig. 2

(A) Representative stress–strain plots of electrospun TPU subjected to uniaxial tension under dry (blue) or wet (red) conditions. For wet conditions material was submerged in aqueous solution during testing. (B) Young’s moduli derived from stress–strain curves comparing dry to wet scaffolds. Each point represented a technical replicate. Statistical significance was determined by an unpaired two-tailed t test, n = 3. C-D. Elasticity of electrospun TPU plotted as the mean stress at 10% strain against the number of cycles equal to 1 h of cyclic tension. Scaffolds were stretched at the (C) human (0.2 Hz) or (D) mouse (1.3 Hz) breathing frequency resulting in 720 and 4700 cycles, respectively. Mean stress: 8.86 ± 0.15 MPa (human), 20.29 ± 2.12 MPa (mouse).