Table 3.
Results of the DSC tests on neat PLA, neat PBAT and PLA/PBAT blends (first and second heating scans).
| Sample | TgPBAT
(°C) |
TgPLA
(°C) |
TccPLA
(°C) |
ΔHccPLA
(J/g) |
TmPBAT
(°C) |
ΔHmPBAT (J/g) | TmPLA
(°C) |
ΔHmPLA (J/g) | χPLA
(%) |
χPBAT
(%) |
|---|---|---|---|---|---|---|---|---|---|---|
| 1st heating | ||||||||||
| PLA | - | 57.6 | - | - | 178.0 | 58.3 | 62.2 | - | ||
| PLA_PBAT_15 | 58.9 | 93.3 | 20.3 | 48.6 | 35.8 | |||||
| PLA_PBAT_30 | −36.9 | 56.5 | 93.0 | 15.2 | 177.1 | 39.8 | 37.7 | |||
| PLA_PBAT_45 | −39.1 | 57.3 | - | - | 114.1 | 2.7 | 178.5 | 32.1 | 62.7 | 6.3 |
| PLA_PBAT_60 | −39.6 | 56.5 | 93.8 | 6.9 | 115.2 | 3.3 | 176.5 | 22.2 | 41.2 | 4.9 |
| PLA_PBAT_75 | −39.1 | 58.5 | 93.7 | 1.8 | 114.7 | 5.9 | 176.1 | 13.0 | 47.9 | 6.9 |
| PBAT | −39.7 | - | - | - | 113.7 | 11.9 | - | - | - | 10.4 |
| 2nd heating | ||||||||||
| PLA | - | 62.4 | - | - | - | - | 179.1 | 54.5 | 58.6 | - |
| PLA_PBAT_15 | −44.1 | 61.4 | - | - | 178.0 | 43.0 | 54.4 | |||
| PLA_PBAT_30 | −41.9 | 61.2 | - | - | 177.3 | 38.6 | 59.3 | |||
| PLA_PBAT_45 | −39.5 | 59.2 | - | - | 114.0 | 3.2 | 177.6 | 31.4 | 61.5 | 6.3 |
| PLA_PBAT_60 | −39.9 | 59.0 | - | - | 114.0 | 4.7 | 177.4 | 22.1 | 59.4 | 6.9 |
| PLA_PBAT_75 | −38.5 | 59.1 | - | - | 113.4 | 6.3 | 176.5 | 14.0 | 56.6 | 7.5 |
| PBAT | −39.0 | - | - | - | 114.2 | 11.2 | - | - | - | 9.8 |
TgPBAT = glass transition temperature of PBAT; TgPLA = glass transition temperature of PLA; TccPLA = cold crystallization temperature of PLA; TmPBAT: melting temperature of PBAT; ΔHmPBAT = melting enthalpy of PBAT; TmPLA: melting temperature of PLA; ΔHmPLA = melting enthalpy of PLA; χPLA= crystallinity degree of PLA; χPBAT= crystallinity degree of PBAT.