Table 2.
The selected characterization results for lignin-based macroinitiators (LnMIs) with different modification degrees.
| Lignin-Based Macroinitiators 1 |
MD (%) 2 | Number of -Br per LnMI 3 | Mn (Da) 4 | EA Results (%) | Yield (%) | ||
|---|---|---|---|---|---|---|---|
| C | N | H | |||||
| LnMI-a | 3.0 | 1.1 | 5166 | 56.09 | 0.73 | 5.02 | 45.4 |
| LnMI-b | 5.2 | 1.9 | 5286 | 63.03 | 0.28 | 5.48 | 46.1 |
| LnMI-c | 20.2 | 7.5 | 6115 | 57.69 | 0.59 | 5.16 | 50.1 |
| LnMI-d | 27.6 | 10.2 | 6523 | 55.30 | 0.40 | 4.40 | 47.8 |
| LnMI-e | 36.7 | 13.6 | 7025 | 54.89 | 0.49 | 4.96 | 53.4 |
| LnMI-f | 44.4 | 16.5 | 7451 | 53.46 | 0.51 | 4.83 | 63.8 |
| LnMI-g | 70.8 | 26.2 | 8908 | 52.04 | 0.94 | 4.96 | 63.5 |
| LnMI-h | 100 | 37.1 | 10,519 | 49.91 | 0.85 | 4.75 | 84.8 |
1 Data for LnMI-f and LnMI-h were reported previously [18]. 2 Calculated according to 1H NMR by comparing the integration of the proton signals due to initiation site to those of 100% modified macroinitiator, LnMI-h. 3 Calculated according to MD and the total hydroxyl amount (37.05 mmol) per mmol of starting lignin. It means the number of initiation site, -OCO-C(CH3)2Br, per LnMI macromolecule on average after modification. 4 Calculated according to MD and the average Mn of starting lignin (5000 Da).