Table 3.
Melting points (Tm1 and Tm2), glass transition temperature (Tg), cold crystallization temperature (Tcc), heat of fusion (ΔHm) and degree of crystallinity (Xc) of PLA during hydrolysis study.
| Sample | Tm1 (°C) | Tm2 (°C) | Tg* (°C) | Tcc* (°C) | ΔHm(J/g) | Xc(%) |
|---|---|---|---|---|---|---|
| PLA | 172.5 | 178.5 | 61.5 | 116.4 | 52.5 | 56.45 |
| PLA 20 days | 173.4 | 179.2 | 62.2 | 113.0 | 55.3 | 59.46 |
| PLA 40 days | 174.3 | 180.5 | 62.1 | 111.6 | 59.6 | 64.08 |
| PLA 60 days | 172.2 | 178.8 | 61.1 | 106.4 | 61.2 | 65.80 |
| PLA 120 days | 172.0 | 178.2 | 61.0 | 102.5 | 60.7 | 65.26 |
*
These data were taken from the second scan after melt quenching of the samples.