Fig. 5. (a) Stress–strain curves of P, S15, C5, C15, and C25. The inset shows the slope line of each curve; (b) tensile strength and Young's modulus of the as-prepared nanofiber membranes. Data are presented as means ± SD (n = 5). The significant difference compared to the control and S15 is marked with the symbol (*) and (#), respectively. (*) and (#) mean p < 0.05, while (**) and (##) mean p < 0.01.
