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Fraction of the carbon functional groups indicated by high-resolution C1s X-ray photoelectron spectroscopy peaks
| Membrane | C–C ~286.6 eV (%) | C–O ~288.1 eV (%) | O=C–O ~290.6 eV (%) | NH–C=O ~289.3 eV (%) |
|---|---|---|---|---|
| PCL | 73.54 | 19.51 | 6.95 | 0 |
| PCL-NH2 | 73.31 | 8.50 | 10.42 | 7.77 |
| PCL-g-HA | 55.68 | 21.57 | 11.55 | 11.20 |
Abbreviations: PCL-g-HA, hyaluronic acid-grafted poly(caprolactone); PCL-NH2, aminolyzed PCL; PCL, poly(caprolactone).
