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Characterization of C:O:N ratio on PCL-PNIPAAm by XPS with various amounts of PNIPAAm-NH2.
| PCL-COO− (g/20 ml of MES) | PNIPAAm-NH2 (g/20 ml of MES) | EDC (g/20 ml of MES) | NHS (g/20 ml of MES) | C:O:N ratio |
|---|---|---|---|---|
| 3.0 | 0 | 0.46 | 0.14 | 6.0:2.0:0 |
| 0.2 | 6.7:2.0:0 | |||
| 0.5 | 6.4:2.4:0 | |||
| 1.0 | 6.8:2.7:0.7 | |||
| 2.0 | 7.0:2.0:1.0 | |||
| 3.0 | 7.3:2.2:1.0 | |||
| 4.0 | 7.2:2.5:1.0 |
