Table 1.
Molecular weight and feed ratios of the poly(ether-ester) (PECL).
| PECLs | ε-CL/g | PEG/g | M theo | M n | Ð M | M NMR | |||
|---|---|---|---|---|---|---|---|---|---|
| −400 | −600 | −1000 | −2000 | ||||||
| -I | 36 | 4.0 | - | - | - | 4000 | 3890 | 1.11 | 3990 |
| -II | 34 | - | 6.0 | - | - | 4000 | 3920 | 1.08 | 4020 |
| -III | 30 | - | - | 10.0 | - | 4000 | 3880 | 1.10 | 3970 |
| -IV | 20 | - | - | - | 20.0 | 4000 | 3940 | 1.12 | 4040 |
Note: Mtheo., theoretical molecular weight calculated from the molar ratio of CL/PEG; Mn and ÐM, number average molecular weight and molecular weight dispersity obtained from GPC; MNMR, molecular weight calculated from the peak integration in 1H NMR.