Preparation of a high strength, rapid self-healing composite gel and its application in electrochemical capacitor

Zhao, Jing; Ji, Guochen; Zhang, Xiuling; Hu, Ruofei; Jiao, Zheng

doi:10.1016/j.polymer.2020.123372

Cited by 15 publications

(12 citation statements)

References 70 publications

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“…As for the Ca[SF] 3 2+ complex, the Ca 2+ ion is coordinated by six oxygen atoms of three SF units with the same bidentate geometry. Meanwhile, the coordination energy of the Ca[SF] 3 2+ complex reaches up to 325.51 kcal/mol, higher than binding energy of other noncovalent bonding composites . When four SF units are applied, the Ca 2+ ion can only be coordinated with three SF units with coordination number 6 due to the strong steric hindrance effect of the SF molecular unit.…”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, the coordination energy of the Ca[SF] 3 2+ complex reaches up to 325.51 kcal/mol, higher than binding energy of other noncovalent bonding composites. 43 When four SF units are applied, the Ca 2+ ion can only be coordinated with three SF units with coordination number 6 due to the strong steric hindrance effect of the SF molecular unit. The results show that SF molecular chains can bond with Ca 2+ to form a relatively stable Ca[SF] 3 2+ complex via six-number coordination interaction.…”

Section: T H I S C O N T E N T I Smentioning

confidence: 99%

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Mechano-Regulable and Healable Silk-Based Materials for Adaptive Applications

et al. 2022

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Mechanically adaptive materials responsive to environmental stimuli through changing mechanical properties are highly attractive in intelligent devices. However, it is hard to regulate the mechanical properties of most mechanically adaptive materials in a facile way. Moreover, it remains a challenge to achieve mechano-regulable materials with mechanical properties ranging from high strength to extreme toughness. Here, inspired by the reversible nanofibril network structure of skeletal muscle to achieve muscle strength regulation, we present a mechano-regulable biopolymeric silk fibroin (SF) composite through regulating dynamic metal−ligand coordination bonds by using water molecules as competitive regulators. Efficient interfacial hydrogen bonds between tannic acid-tungsten disulfide nanohybrids and the SF matrix endow the composite with high mechanical strength and selfhealing ability. The resulting composite exhibits 837-fold change in Young's modulus (5.77 ± 0.61 GPa to 6.89 ± 0.64 MPa) after water vapor triggering, high mechanical properties (72.5 ± 6.3 MPa), and excellent self-healing efficiency (nearly 100%). The proofof-concept ultraconformable iontronic skin and smart actuators are demonstrated, thereby providing a direction for future selfadaptive smart device applications.

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Section: Resultsmentioning

confidence: 99%

Section: T H I S C O N T E N T I Smentioning

confidence: 99%

Mechano-Regulable and Healable Silk-Based Materials for Adaptive Applications

et al. 2022

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“…Density functional theory (DFT) was applied to perform specific computational studies on the hydrogen bonding between CT-HEP and TA. , Geometric optimization of molecular structures and single-point energy calculations during the simulation were performed based on the B3LYP/6-31G* theory utilizing the Gaussian 09 package. Notably, the experiments employ only one repeating unit of CT to acquire reasonable data about hydrogen bonding ((TA)–O and H–O (CT), (TA)–H and O–(CT)) so as to facilitate the simulation procedure.…”

Section: Resultsmentioning

confidence: 99%

“…29 Density functional theory (DFT) was applied to perform specific computational studies on the hydrogen bonding between CT-HEP and TA. 30,31 Geometric optimization of molecular structures and single-point energy calculations…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Biobased Reversible Cross-Linking Enables Self-Healing and Reprocessing of Epoxy Resins

Wang

Feng

Pei

et al. 2022

ACS Sustainable Chem. Eng.

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The rapid development of thermosetting polymers contributes strongly to environmental pollution, petrochemical resource consumption, and increasing carbon dioxide emission. Introducing a reversible supramolecular cross-linking network into the thermosetting polymer to endow it with reprocessability and self-healing ability is highly attractive for the reduction of fossil fuel consumption. Despite the tremendous advancement in recyclable thermosetting polymers, using biobased materials to construct reversible cross-links, which can realize the high biomass carbon content of materials, remains challenging. Here, we present a selfhealing and reprocessable epoxy resin enabled by biobased multiple hydrogen bonds between biological tannic acid and chitosan. The binding energy simulation demonstrates that effective hydrogen bonds are constructed in the epoxy resin. The resultant supramolecular cross-linked epoxy resin shows improved mechanical properties (tensile strength increased by two times, toughness increased by 2.7 times), high self-healing efficiency (104% toughness recovery) at room temperature, and excellent reprocessability (109% toughness recovery). We envision that the proposed biobased reversible cross-linking strategy will be useful in the greening and recycling of various thermosetting polymers, such as rubbers, crosslinked plastics, etc.

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“…Compared with the P–O–R groups, the P–O–H and PO groups show more obvious changes in binding energy and relative content (Figure f) in the presence of APM. In particular, the binding energy of P–O–H exhibited a negative shift from 135.3 to 134.3 eV, indicating the transfer of a small amount of electron density owing to the formation of a hydrogen bond (P–O–H···N/O) . Similarly, the shift in the binding energy of the PO group from 134.4 to 133.5 eV was ascribed to the formation of a PO···H bond between the analyte and a POE group .…”

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confidence: 99%