Figure 10

AFM-derived: (A) Force-distance curve and (B) Young’s surface modulus for PET2018, PET2009, and PET1993 before and after PNaSS grafting (NG: non-grafted and G: grafted). Measurement in air (25 °C), 256 points/line, n = 3, **p < 0.001, ***p < 0.05.