Table 3.
Glass transition temperature (Tg), width of the glass transition (∆Tg), heat capacity increment at the glass transition (∆Cp), crystallization (Tc) and melting (Tm) temperature, enthalpy of fusion (ΔHf), degree of crystallinity PHBV (Xc PHBV) and PVA (Xc PVA) and 50% weight loss decomposition temperature (Td-50%) for neat PHBV and PVA, crosslinked PVA, PHBV/PVA blend and semi-IPN PHBV/PVA.
| Sample |
Tg (°C) |
ΔTg
(°C) |
ΔCp
(J/g °C) |
Tc (°C) |
Tm (°C) |
ΔHf (J/g) |
Xc PHBV |
Xc PVA |
Td-50% (°C) |
|---|---|---|---|---|---|---|---|---|---|
| PHBV | 0.77 | 3.67 | 0.5 | 46.7(*) | 160.5 | 73.5 | 0.56 | - | 276.1 |
| PVA | 69.2 | 13.2 | 0.55 | 183.5 | 217.5 | 64.4 | - | 0.44 | 286.8 |
| PVA E | 74 | 36 | 2.05 | - | - | - | - | - | 386.9 |
| PHBV/PVA | 32.8 | 33.3 | 0.54 | 154 | 192.4 | 17.32 | - | 0.16 | 315.8 |
| PHBV/PVA E | 49.2(**) | - | - | 151.5 | 188.2 | 11.2 | - | 0.09 | 359.2 |
(*) Cold crystallization. (**) Obtained from the derivative curve (dcp/dT vs. T).