Table 3.
Thermal properties of polyurethanes and their blends with PDLLA before and after incubation in hydrolytic (PBS) and oxidative (OX) solutions
| Sample | Incubation time (weeks) | T m1 (°C) | ΔH 1 (J/g) | T m2 (°C) | ΔH 2 (J/g) | T m3 (°C) | ΔH 3 (J/g) |
|---|---|---|---|---|---|---|---|
| PUR 10 | 0* | 54.2 | 9.1 | 88.1 | 1.8 | 121.4 | 0.60 |
| PUR 10 (PBS) | 12 | 57.6 | 7.5 | 97.4 | 5.9 | – | – |
| 36* | 60.6 | 12.3 | 99.0 | 5.3 | – | – | |
| PUR 10 (OX) | 12 | 59.3 | 15.5 | – | – | 120.2 | 0.20 |
| 16* | 56.9 | 14.5 | – | – | – | – | |
| PUR 10/PDLLA | 0 | 51.9 | 18.6 | – | – | 121.9 | 0.01 |
| PUR 10/PDLLA (PBS) | 12 | 61.5 | 15.4 | – | – | 120.1 | 0.20 |
| 36 | 58.1 | 18.7 | – | – | 124.7 | 0.01 | |
| PUR 10/PDLLA (OX) | 12 | 72.5 | 23.0 | – | – | 120.2 | 0.07 |
| 16 | 58.5 | 12.6 | – | – | 125.0 | 0.03 | |
| PUR 30 | 0* | 54.1 | 15.9 | 94.8 | 0.7 | – | – |
| PUR 30 (PBS) | 12 | 58.8 | 10.9 | 105.4 | 3.8 | – | – |
| 36* | 56.1 | 15.6 | 105.7 | 8.0 | – | – | |
| PUR 30 (OX) | 12 | 61.3 | 12.9 | – | – | 119.9 | 0.30 |
| 16* | 57.7 | 11.2 | – | – | 120.6 | 0.20 | |
| PUR 30/PDLLA | 0 | 54.7 | 19.2 | – | – | 125.2 | 0.02 |
| PUR 30/PDLLA (PBS) | 12 | 64.0 | 11.7 | – | – | 120.5 | 0.10 |
| 36 | 54.1 | 18.9 | – | – | 124.4 | 0.10 | |
| PUR 30/PDLLA (OX) | 12 | 61.7 | 9.0 | – | – | 120.2 | 0.06 |
| 16 | 58.8 | 16.8 | – | – | – | – |
* Data presented in (Brzeska et al. 2017)