Table 2.
DSC results for PBS, PBAT and their blend during the second heating. The values of melting enthalpy in parentheses are normalized with respect to the weight fraction of the polymer in the blends.
| Sample | T0.1% (°C) | T99% (°C) | Tm PBAT (°C) | Tm PBS (°C) | ΔHm PBAT (J/g) | ΔHm PBS (J/g) | ΔXPBAT (%) | ΔXPBS (%) |
|---|---|---|---|---|---|---|---|---|
| PBAT | 84.3 | 140.2 | 120.9 | - | 22.2 | - | 19.5 | - |
| PBS25/PBAT75 | 89.7 | 143.6 | 122.5 | 114.0 | 8.3 (11.1) | 16.7 (66.8) | 9.7 | 60.7 |
| PBS50/PBAT50 | 90.8 | 133.8 | 122.8 | 101.1 (Tm1), 113.1 (Tm2) | 3.9 (7.8) | 28.4 (56.8) | 6.8 | 51.6 |
| PBS75/PBAT25 | 105.4 | 120.3 | N.D. | 101.2 (Tm1), 113.0 (Tm2) | 1.9 (7.6) | 54.1 (72.1) | 6.7 | 65.6 |
| PBS | 106.0 | 119.4 | - | 101.8 (Tm1), 113.6 (Tm2) | - | 72.2 | - | 65.6 |
T0.1% and T99.9% are the temperatures required to achieve 0.1% and 99.9% molten fraction or relative crystallinity, Tm is the melting peak temperature, ΔHm is the melting enthalpy, and ΔX is the change in crystallinity during the event.