Table 1.
Synthesis of CL, rac-LA and PEG copolymers.
| Sample | Molar Ratio a | Yield [%] |
Mnb [g/mol] |
Đ b | % mol CL or LA c |
% mol PEG c |
|---|---|---|---|---|---|---|
| PLA-PEG-1 | 20:1 | 77 | 3200 | 1.69 | 79.7 | 20.3 |
| PLA-PEG-2 | 25:1 | 72 | 3400 | 1.57 | 84.9 | 15.1 |
| PLA-PEG-3 | 30:1 | 69 | 3500 | 1.62 | 88.3 | 11.7 |
| PCL-PEG-1 | 30:1 | 88 | 3400 | 1.48 | 80.4 | 19.6 |
| PCL-PEG-2 | 35:1 | 80 | 3500 | 1.43 | 84.3 | 15.7 |
| PCL-PEG-3 | 40:1 | 76 | 3700 | 1.52 | 88.9 | 11.1 |
arac-LA (or CL): PEG 400 molar ratio; b average molar mass and dispersity determined by the GPC method; c percent of mers molar content in the chain (determined by 1H NMR);Reaction conditions: temp. 80 °C, time—7days, medium—toluene, CALB (400 mg).