Table 3.
Activation energy values (Ea) and their respective conversion levels for PVDF in stages unaged, aged in bioethanol for 30 and 90 days and annealed for 90 days.
| Conversion degree, α (%) | Unaged PVDF (kJ mol─1) |
Aged 30 days in bioethanol (kJ mol─1) |
Aged 90 days in bioethanol (kJ mol─1) |
Annealed 90 days (sample 1) (kJ mol─1) |
Annealed 90 days (sample 2) (kJ mol─1) |
|---|---|---|---|---|---|
| 5 | 189.0 | 156.6 | 123.2 | 204.7 | 186.7 |
| 10 | 183.7 | 163.5 | 129.3 | 193.7 | 188.4 |
| 15 | 182.9 | 164.9 | 132.2 | 188.3 | 185.0 |
| 20 | 182.3 | 165.8 | 135.7 | 184.2 | 184.5 |
| 25 | 182.8 | 166.2 | 140.0 | 181.8 | 183.5 |
| 30 | 183.5 | 165.9 | 143.6 | 181.5 | 183.4 |
| 35 | 184.6 | 165.6 | 147.4 | 182.6 | 183.4 |
| 40 | 186.4 | 166.1 | 150.1 | 184.1 | 184.5 |
| 45 | 187.5 | 166.3 | 152.2 | 188.6 | 187.9 |
| 50 | 189.8 | 166.5 | 155.4 | 193.2 | 193.4 |
| Average | 185.3 ± 2.7 | 164.7 ± 3.0 | 140.9 ± 10.7 | 188.3 ± 7.3 | 186.1 ± 3.1 |