Table 2.
Effect of some (thermo)mechanical treatments and processing on the thermal and mechanical properties of PLA.
| Material | Tg(°C) | Tm(°C) | ΔHcc(J/g) | ΔHm(J/g) | Xc(%) | Yield stress σ y (MPa) | Young's modulus E (GPa) | Elongation at break εb (%) | Charpy (KJ/m2) | Izod impact (KJ/m2) | References |
|---|---|---|---|---|---|---|---|---|---|---|---|
| PLA-96 | 60 | 148 | – | 1 | 1 | 56.2 ± 0.7 | 4.0 ± 0.2 | 24 ± 5 | Gamez-Perez, 2010 | ||
| PLA-98 | 61 | 164 | 29 | 31 | 2 | 58.4 ± 0.5 | 4.3 ± 0.1 | 17 ± 4 | |||
| PLA-96T | 56 | 148 | – | 1 | 1 | 47.3 ± 1.1 | 3.3 ± 0.2 | 456 ± 100 | |||
| PLA-98T | 57 | 165 | 31 | 34 | 3 | 53.4 ± 0.6 | 3.5 ± 0.3 | 422 ± 50 | |||
| Un-oriented | 47.0 | 3.65 | 1.5 | 12.5 | 1.6 | Grijpma et al., 2002 | |||||
| Oriented (λ = 2.5) | 73.3 | 4.49 | 48.2 | 35.9 | 5.9 | ||||||
| Oriented (λ = 3.4) | 66.3 | 3.74 | 21.8 | No break | 52.0 | ||||||
| PLA-I | 65.6 ± 1.3 | 3.7 ± 0.1 | 4.0 ± 0.8 | Carrasco et al., 2010 | |||||||
| PLA-EI | 65.2 ± 0.9 | 3.9 ± 0.1 | 5.4 ± 0.6 | ||||||||
| PLA-IA | 75.4 ± 0.9 | 4.1 ± 0.1 | 2.5 ± 0.2 | ||||||||
| PLA-EIA | 77.0 ± 1.1 | 4.1 ± 0.1 | 3.3 ± 0.3 |
I, Injected; IA, Injected then Annealed; EI, Extruded then Annealed; EIA, Extruded then Injected then Annealed.