Review Article
Self-Healing Polymers Designed for Underwater Applications
Table 1
Metal–ligand coordination characterization methods.
| Polymer | Metal | Ligand | Characterization methods | Ref | FTIR | Raman | UV–Vis |
| Poly(ethylene glycol) diglycidyl ether (PEG-DE) | Fe3+ | Catechol | — | 512–627 cm−1 (catechol–Fe3+ bond vibrations) | — | [58] | Polyethylene glycol (PEG) | Fe3+ | Dopa | — | 500–650 cm−1 (chelation of the Fe3+ by catechol) | — | [56] | Methyl vinyl silicone rubber | Fe3+ | Dopa | — | 500–600 cm−1 (coordination between DOPA and Fe3+) | 500–600 nm (coordination between Fe3+ and catechol groups) | [5] | Nitrile butadiene rubber (NBR) | Zn2+ | Acrylonitrile | 2,280 cm−1 (restricted −CN in Zn2+−CN coordination) - | — | — | [57] | – | Zn2+ | Terpyridine | — | — | 392 nm (Zn2+-terpyridine complex) | [59] | Hexamethylene diisocyanate (HDI) and polydimethylsiloxane (PDMS) | Ln3+ | Terpyridine | 1,587, 1,571, and 1,562 cm−1 (terpyridine C = N, linked to terpyridine and Ln3+ complexation) | — | 292 nm (π–pyridine ring transition) and red-shifted to 324 nm | [60] | Polyethylene glycol (PEG) | Ni2+ | Histidine | — | 1,596 cm−1 (coordination between Histidine and Ni2+) | — | [61] |
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