Table 3.
Contact angle and mechanical characterization of polyurethane-based coatings.
| Ref. | Coating Type |
Contact Angle (Water) |
Dolly-Pull Off Adhesion Test (MPa) | Hardness (GPa) | Modulus (GPa) | Tensile Strength (MPa) | Elongation at Fracture (%) |
|---|---|---|---|---|---|---|---|
| [36] 1 | polyurethane | 75-85 | 3.1 | - | - | - | - |
| [52,53] 2 | polyurethane | - | 7.2 | - | 0.07 | 11.63 | 65 |
| [54] 3 | polyurethane/ polydimethylsiloxane |
106 | - | - | - | - | - |
| [55] | polyurethane modified with hard//soft segment (PPG-TDI-BDO) | 94 | - | - | 0.26 | - | 14 |
| [56] | polythiourethane (PTU)/ZnO | 72.8 ± 3.3 | 0.64 ± 0.04 | 81.0 ± 1.6 | 0.952 ± 0.083 | 58.7 ± 1.4 | 12.1 ± 0.5 |
| [57] | polyurethane/ multiwalled carbon nanotubes |
- | 5B | 7H | - | - | - |
1 Cross cut adhesion: level 1–2. 2 Impact test: 4.9 J. 3 Modulus: 1.3 MPa, Tensile strength: 2.09 MPa, Elongation at fracture: 1315%, Surface roughness: 0.1 micron (Rz), 0.02 micron (Ra), contact angle in diiodomethane: 63°.