Table 1.
Characteristics of triblock copolymers PCL-PLA-PCL synthesised with the use of different protective substances.
| N | Protective additive | Mn (SEC), Da, (Mn/Mw) | Crystallinity (%) and (melting temperature (°C)) | PCL/PLA segment length, monomer units | |
|---|---|---|---|---|---|
| PCL | PLA | ||||
| 1 | α-Methyl styrene | 73,175 (1.51) | 43.8 (52.4) | 52.6 (165.3) | 36.2/49.3 |
| 2 | Styrene | 71,435 (1.56) | 26.5 (49.4) | 42.7 (164.9) | 17.5/51.1 |
| 3 | Ethyl benzoate | 58,310 (1.71) | — | 30.0 (154.8) | 13.0/21.1 |
| 4 | Diethyl hexyl phthalate | 43,910 (1.60) | — | 19.1 (127.4) | 7.0/11.9 |
| 5 | Dioctyl phthalate | 45,275 (1.61) | — | 21.9 (140.1) | 6.7/14.0 |
| 6 | Diallyl phthalate | 60,530 (1.61) | — | 17.5 (135.8) | 6.1/10.9 |
| 7 | No additive | 45,060 (1.72) | — | — | 5.8/7.8 |