Photoregulating of Stretchability and Toughness of a Self‐Healable Polymer Hydrogel

Xiong, Chenxiao; Zhang, Youmin; Xie, Meiran; Sun, Ruyi

doi:10.1002/marc.201800018

Cited by 26 publications

(17 citation statements)

References 40 publications

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“…(a represents the hydrogel after UV irradiation). b) Comparison of mechanical properties of photochromic hydrogels doped with different photochromic molecules, e.g., lanthanide ions, [ 32,33 ] polymetallic oxides, [ 34,35 ] diarylvinyl, [ 36 ] azobenzene, [ 37 ] and spiropyran. [ 38–41 ]…”

Section: Resultsmentioning

confidence: 99%

High‐Performance Photochromic Hydrogels for Rewritable Information Record

Long

Jin

et al. 2021

Macromol. Rapid Commun.

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Rewritable information record materials usually demand not only reversibly stimuli‐responsive ability, but also strong mechanical properties. To achieve one photochromic hydrogel with super‐strong mechanical strength, hydrophobic molecule spiropyran (SP) has been introduced into a copolymer based on ion‐hybrid crosslink. The hydrogels exhibit both photoinduced reversible color changes and excellent mechanical properties, i.e., the tensile stress of 3.22 MPa, work of tension of 12.8 MJ m−3, and modulus of elasticity of 8.6 MPa. Moreover, the SP‐based Ca2+ crosslinked hydrogels can be enhanced further when exposed to UV‐light via ionic interaction coordination between Ca2+, merocyanine (MC) with polar copolymer chain. In particular, hydrogels have excellent reversible conversion behavior, which can be used to realize repeatable writing of optical information. Thus, the novel design is demonstrated to support future applications in writing repeatable optical information, optical displays, information storage, artificial intelligence systems, and flexible wearable devices.

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Section: Resultsmentioning

confidence: 99%

High‐Performance Photochromic Hydrogels for Rewritable Information Record

Long

Jin

et al. 2021

Macromol. Rapid Commun.

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“…We observed that as-made hydrogels exhibited initial tensile moduli of ∼815 kPa, which is among the strongest supramolecular hydrogels with healing ability as compared with other recently reported self-healing materials with comparable healing times (Table S1). − We found that upon severing the hydrogels and healing for 24 h, the initial tensile modulus was similar at 785 ± 40 kPa.…”

Section: Resultsmentioning

confidence: 99%

β-Lactamase Responsive Supramolecular Hydrogels with Host–Guest Self-Healing Capability

Alkekhia

Shukla

2019

ACS Appl. Polym. Mater.

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Smart supramolecular materials have gained popularity for a range of applications, including sensing, drug delivery, and tissue engineering. In this work, we describe a “host–guest” supramolecular hydrogel formulated with a bifunctional guest complex. Polymeric cyclodextrin (PCD) was utilized as the host backbone of the hydrogel, which was reinforced with an interpenetrating network polymerized by acrylamide/N-vinylpyrrolidinone. The guest molecule developed here was designed to not only enable molecular association with PCD, imparting hydrogels with a self-healing capability, but also undergo enzymatic cleavage, causing macroscale degradation of the hydrogel. This dual functional behavior was obtained by incorporation of two adamantane (AD) moieties on the guest, which form cross-links between the PCD hydrophobic cavities and a β-lactam core, which is cleaved by bacteria produced β-lactamases (βLs). The supramolecular host–guest hydrogels underwent self-healing upon severing and were able to regain an initial tensile modulus comparable to that of the as-formed hydrogels within ∼20 h. The hydrogels were also found to remain stable at simulated physiological conditions (phosphate buffered saline, pH 7.4, 37 °C) and degrade specifically in the presence of βLs from Bacillus cereus and Enterobacter cloacae over 28–35 h. Hydrogels with a protecting group attached to a common βL recognition site on the guest exhibited a significantly slower degradation, confirming that hydrogel degradation is specific to βL cleavage of the guest molecule. This βL responsive degradation was translated to bacteria, resulting in complete degradation of hydrogels incubated with cultures of βL producing bacteria in approximately 72 h, while those incubated with non-βL producing bacteria remained stable over this time. The supramolecular host–guest hydrogels developed here are promising for future applications of bacteria-responsive materials, including controlled drug delivery and diagnostics, in which a robust material capable of self-healing is desirable.

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“…Recently, a photoregulated photochromic hydrogel formed of spiropyran functionalised polyacrylamide (PAM) chain, decorated with azobenzene and β-CD pendant groups that could self-heal within 10 s was reported. 173 Toughness of the hydrogel was controlled by dynamic host-guest interaction between cyclodextrin and azobenzene as azobenzene isomerises upon irradiation with light ( Fig. 25).…”

Section: Hydrogelsmentioning

confidence: 99%