Multi-stimuli responsive supramolecular hydrogels based on Fe³⁺ and diblock copolymer micelle complexation

Abstract

We report a multi-stimuli responsive supramolecular hydrogel with great potential for biomedical application, which was composed of the micelle-forming diblock copolymer and physically cross-linked by complexation between ferric ions and carboxylic acid groups, exhibiting gel–sol transition caused by UV irradiation, multidentate ligands (EDTA) and redox agents (Na2S2O4).

Recent Advances in Metal‐Containing Polymer Hydrogels

“…[12] The obtained hydrogels exhibited sol-gel transition behaviors by UV irradiation, multidentate ligand (EDTA), and redox agent (Na 2 S 2 O 4 ).…”

Supra‐dendron Gelator Based on Azobenzene–Cyclodextrin Host–Guest Interactions: Photoswitched Optical and Chiroptical Reversibility

“…[1][2][3][4][5] Numerous soft, smartm aterials have been fabricated based on such responsive gels, which find many applications in various fields, such as biological substance release, [6][7][8] mechanical shape memory, [9,10] environmental remediation, [11][12][13][14] and so forth. [1][2][3][4][5] Numerous soft, smartm aterials have been fabricated based on such responsive gels, which find many applications in various fields, such as biological substance release, [6][7][8] mechanical shape memory, [9,10] environmental remediation, [11][12][13][14] and so forth.…”

Characterization of slow‐release collagen‐g‐poly(acrylic acid‐co‐2‐acrylamido‐2‐methyl‐1‐propane sulfonic acid)–iron(III) superabsorbent polymer containing fertilizer

“…Nevertheless, it is worthwhile to highlight that the weight loss of the collagen‐ g ‐p(AA‐ co ‐AMPS)–Fe(III) polymer was lower than that of the collagen‐ g ‐p(AA‐ co ‐AMPS) polymer, and the former was more difficult to decompose between 25 and 700 °C. This could be explained by the fact that the stability of the complex of ferric iron was relatively high and the collagen‐ g ‐p(AA‐ co ‐AMPS)–Fe(III) polymers had better thermal stability because of the complicated Fe 3+ complex structure formed by the coordination of ferric ions with various functional groups . These results seem to further support the existence of a crosslinked structure with enhanced thermal stability …”

“…The three‐dimensional crosslinked structure of the copolymers, which was formed because of the presence of the crosslinker, rendered the copolymer stable in solution and able to hold large quantities of water . Subsequently, the carboxyl groups on the collagen‐ g ‐p(AA‐ co ‐AMPS) polymer chain complexed rapidly with Fe 3+ to form stable ligand–metal compounds . Urea acted as a pore maker because of its decomposition into gas during the heating of microwave radiation, so the polymer had a more uniform, porous, three‐dimensional network structure.…”