Figure 3.

Self-healing magnetic polymer composites (2/3). (a) Magnetic self-healing polysaccharide hydrogel based on dynamic enamine bond. Preparation and self-healing process remotely guided by a NdFeB magnet (reproduced with permission from Chinese Journal of Chemistry, Wiley) [22]. (b) Carboxyethyl chitosan (CEC) and oxidized alginate (OAlg) hydrogel integrated with magnetic gelatin microspheres (MGMs) containing 5-fluorouracil (5-Fu) synthesized via Schiff-base reaction. Preparation and self-healing process (reproduced with permission from Materials Science and Engineering, Wiley) [23]. (c) Nanocomposite combining the shape-memory-assisted self-healing capability of “mussel-inspired” dopamine-functionalized polyurethane (PU) with synergistic electromagnetic interference-shielding capabilities from multiwalled carbon nanotubes (MWCNTs) and ferrite doped with MoS2 (Fe₃O₄@MoS₂). Schematic representation of the synthesis of PU–Dopa (left) and synthesis of Fe₃O₄@MoS₂ (right). The self-healing polymer was prepared by solution casting method, mixing the PU–Dopa polymer matrix with 5 wt% of Fe₃O₄@MoS₂ nanoparticles and 3 wt% of carbon nanotubes MWCNTs (reproduced with permission from Applied Polymer Materials, ACS) [24]. (d) Carboxymethyl hydroxypropyl (CMHPG)/borate and cobalt ferrite nanoparticle self-healing composite (reproduced from Nanomaterials, Open Access) [25]. (e) Self-healing composite based on polypyrrole (PPy), ZnFe₂O₄, and multi-walled carbon nanotubes (MWCNTs) embedded in a PVA hydrogel (reproduced with permission from Journal of Alloys and Compounds, ScienceDirect) [26].