Table 1:
Composition and molecular weight characteristics of PEG macroinitiators and PEG-b-PCL block copolymers.
| Polymer | PEG Mn (kDa) |
PCL Mn (kDa)a |
Copolymer Mn (kDa)a |
Ð
Mw/Mn b |
DP PEG; PCL |
Mass fraction |
|
|---|---|---|---|---|---|---|---|
| f PEG | f PCL | ||||||
| PEG2PCL0.4 | 2.0 | 0.4 | 2.4 | 1.03 | 45; 4 | 0.83 | 0.17 |
| PEG2PCL1.1 | 2.0 | 1.1 | 3.1 | 1.02 | 45; 10 | 0.65 | 0.35 |
| PEG2PCL1.8 | 2.0 | 1.8 | 3.8 | 1.02 | 45; 16 | 0.53 | 0.47 |
| PEG2PCL4.0 | 2.0 | 4.0 | 6.0 | 1.03 | 45; 35 | 0.33 | 0.67 |
|
| |||||||
| PEG5PCL0.6 | 5.0 | 0.6 | 5.6 | 1.01 | 114; 5 | 0.89 | 0.11 |
| PEG5PCL1.3 | 5.0 | 1.3 | 6.3 | 1.02 | 114; 11 | 0.79 | 0.21 |
| PEG5PCL2.4 | 5.0 | 2.4 | 7.4 | 1.02 | 114; 21 | 0.68 | 0.32 |
| PEG5PCL4.2 | 5.0 | 4.2 | 9.2 | 1.03 | 114; 37 | 0.54 | 0.46 |
| PEG5PCL9.5 | 5.0 | 9.5 | 14.5 | 1.09 | 114; 83 | 0.34 | 0.66 |
|
| |||||||
| PEG10PCL3.2 | 10.0 | 3.2 | 13.2 | 1.02 | 227; 28 | 0.76 | 0.24 |
| PEG10PCL7.9 | 10.0 | 7.9 | 17.9 | 1.04 | 227; 69 | 0.56 | 0.44 |
| PEG10PCL10.7 | 10.0 | 10.7 | 20.7 | 1.04 | 227; 94 | 0.48 | 0.52 |
| PEG10PCL14.9 | 10.0 | 14.9 | 24.9 | 1.12 | 227; 131 | 0.40 | 0.60 |
a
Mn calculated from 1H NMR spectroscopy.
b
Mn and Ð calculated by GPC with reference to a conventional column calibration with narrow molecular weight PEG standards.