Tough supramolecular hydrogels with excellent self-recovery behavior mediated by metal-coordination interaction

Based on the strategy of dynamic metal-coordination for improving mechanical properties, a further ideal was taken to prepare the tough hydrogels with the combination of self-crosslinking monomer and metal-coordination complexes. Herein, a series of hydrogels of poly(acrylamide-co-acrylic acid-co- N...

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Bibliographic Details
Published in:Polymer (Guilford) 2019-05, Vol.171, p.201-210
Main Authors: Ding, Hongyao, Liang, Xiaoxu, Zhang, Xin Ning, Wu, Zi Liang, Li, Zongjin, Sun, Guoxing
Format: Article
Language:English
Subjects:
Acrylamide
Acrylic acid
Actuators
Coordination compounds
Crosslinking
Flexible components
Hydrogels
Iron
Materials recovery
Mechanical properties
Metal-coordination
Metals
Moisture content
Molecular structure
Organic chemistry
Self-recovery
Shape memory
Tough hydrogels
Toughness
Water content
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Summary:Based on the strategy of dynamic metal-coordination for improving mechanical properties, a further ideal was taken to prepare the tough hydrogels with the combination of self-crosslinking monomer and metal-coordination complexes. Herein, a series of hydrogels of poly(acrylamide-co-acrylic acid-co- N-hydroxymethyl acrylamide) (P(AM-co-AAc-co-NMAM)) consisting the chemical crosslinking induced by NMAM units and the physical crosslinking derived from the coordination complexes of carboxyl-Fe3+ were prepared. The molecular structure was investigated with the ATR-FTIR, Raman and UV-vis spectra. These hydrogels with different water content of 57–93% possess good mechanical performances. The optimal hydrogels possess high tensile strength (8.56 MPa), prominent modulus (15.5 MPa), remarkable toughness (37.85 MJ/m3) and superb tearing energy (7062 J/m2). The tough hydrogels also display excellent self-recovery (95% toughness recovery within 50 min), pH-triggered healing, shape memory and plasticity abilities. These hydrogels having high strength and toughness may broaden range of potential applications in load-bearing soft actuators, flexible electronics, etc. [Display omitted] •A series of novel hydrogels were fabricated by introducing metal-coordination interaction and self-crosslinking.•The hydrogels display outstanding mechanical properties.•The hydrogels possess excellent self-recovery, pH-triggered healing and shape memory abilities.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2019.03.061