Table 2.
Young’s modulus and loading–unloading behavior of UV-cured PU and reinforced with modified CNF with PEG and rGO.
| Sample | Tensile Strength (MPa) | Elongation (mm) | Young’s Modulus (MPa) | Max Depth (nm) | Hardness (MPa) |
|---|---|---|---|---|---|
| PU | 21.24 ± 0.21 | 3.50 ± 0.21 | 9.79 ± 0.15 | 3008 ± 15 | 32.7 ± 0.2 |
| PU-PEG | 22.93 ± 0.20 | 3.26 ± 0.14 | 9.74 ± 0.12 | 2538 ± 3 | 40.2 ± 0.2 |
| PU-1%CNF/PEG | 24.34 ± 0.19 | 3.14 ± 0.15 | 10.15 ± 0.12 | 2229 ± 11 | 52.8 ± 0.1 |
| PU-3%CNF/PEG | 26.30 ± 0.23 | 2.94 ± 0.19 | 10.78 ± 0.14 | 2185 ± 7 | 59.6 ± 0.3 |
| PU-5%CNF/PEG | 9.14 ± 0.16 | 1.76 ± 0.23 | 6.18 ± 0.09 | 2707 ± 5 | 32.5 ± 0.1 |
| PU-rGO | 23.15 ± 0.19 | 3.35 ± 0.23 | 10.43 ± 0.13 | 2502 ± 8 | 46.9 ± 0.2 |
| PU-1%CNF/rGO | 27.07 ± 0.30 | 3.14 ± 0.15 | 10.88 ± 0.16 | 2000 ± 12 | 74.4 ± 0.3 |
| PU-3%CNF/rGO | 29.16 ± 0.26 | 2.97 ± 0.21 | 12.41 ± 0.18 | 1934 ± 8 | 75.0 ± 0.2 |
| PU-5%CNF/rGO | 24.21 ± 0.21 | 3.25 ± 0.24 | 9.93 ± 0.12 | 2018 ± 6 | 68.2 ± 0.3 |
| PU-10%CNF/rGO | 5.94 ± 0.12 | 1.64 ± 0.32 | 3.44 ± 0.09 | 3419 ± 7 | 26.4 ± 0.1 |