Stretchable self-healing hydrogels capable of heavy metal ion scavenging

Abstract

Stretchable PA/CS polymer hydrogels with multiresponsiveness presented rapid self-healing behavior, and can be used for metal ions scavenging.

Tough Polyelectrolyte Hydrogels with Antimicrobial Property via Incorporation of Natural Multivalent Phytic Acid

“…For all pTMAEMA-PA samples, the storage modulus G′ was greater than the loss modulus G′′ and tan δ < 1, demonstrating a gel-like property of pTMAEMA-PA (Figure 2a,b). Furthermore, the increase in G′ according with the PA concentration is due to a higher crosslinking density as well as a higher order of ion bridges distributing within pTMAEMA-PA [49]. Additionally, the tan δ is closer to 0 when the concentration of PA was 1 M, indicating the distinguish elasticity of pTMAEMA-PA-1 as the ideal elastic material obtains tan δ = 0.…”

Advances in Synthesis and Applications of Self-Healing Hydrogels

“…After cutting and self-healing, the electrochemical performance could nearly recover completely, making it possible to be tailored into complicated shapes and patterns, and thus able to be recycled. Song D. et al (2019) prepared a self-healing hydrogel with the capability of scavenging heavy metal ions. The hydrogel was based on PA and chitosan (CS).…”

“…The related mechanisms can combine several dynamic chemical covalent bonds; for example, combining imine bonds with acylhydrazone bonds ( Wang L. et al, 2018 ) or with boronate-diol complexation ( Balakrishnan et al, 2019 ). On the other hand, the rest combines different physical non-covalent interactions, such as combining hydrogen bonds with ionic interaction ( Long et al, 2018 ; Jiang X. et al, 2019 ; Li S. et al, 2019 ; Lin et al, 2019 ; Song D. et al, 2019 ; Yuan et al, 2019 ; Zhang et al, 2019 ), with π-π stacking ( Liao et al, 2017 ; Gavel et al, 2018 ; Liang et al, 2019 ; Xu J. et al, 2019 ), and others ( Chen et al, 2019b ; Qiao et al, 2019 ), combining ionic interaction with hydrophobic interaction ( Chen et al, 2019b ), or combining multiple non-covalent interactions ( Wang S. et al, 2018 ; Deng et al, 2019 ). Additionally, some belong to both categories, such as using both boronate-diol complexation and hydrogen bonds ( Ding et al, 2018 ; Peng et al, 2019 ; Shao et al, 2019 ; Wang M. et al, 2019 ), both imine bond and hydrogen bonds ( Liu et al, 2018 ; Cheng et al, 2019 ), both host-guest interaction and boronate-diol complexation ( Yang et al, 2019 ), both metal-ligand coordination and hydrophobic interaction ( Tang et al, 2018 ), both dipole-dipole association and boronate-diol complexation ( Chen Y. et al, 2018 ), and multiple ones ( Jing et al, 2018 ; Qu et al, 2018 ; Pan et al, 2019 ; Xu H. et al, 2019 ).…”

“…In addition to pharmaceutical and biomedical applications (for example, drug delivery and tissue regeneration), some self-healing hydrogels with interesting properties can also be used in other areas, such as batteries ( Huang et al, 2019 ), in environmental protection ( Kuddushi et al, 2019 ; Song D. et al, 2019 ), in food spoilage monitoring ( Tang et al, 2018 ), and so on. Some applications take advantage of the self-healing property directly, while others are improved due to the self-healing property, for example, lifetime extension.…”

“… Song D. et al (2019) prepared a self-healing hydrogel with the capability of scavenging heavy metal ions. The hydrogel was based on PA and chitosan (CS).…”