Tough and Self-Healing Waterborne Polyurethane Elastomers via Dynamic Hydrogen Bonds Design for Flexible Conductive Substrate Applications

Song, Yinghu; Li, Jialiang; Song, Guojun; Li, Xiaoru

doi:10.1021/acsami.3c12688

Cited by 17 publications

(1 citation statement)

References 49 publications

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“…After 25 min of exposure to visible light, the film successfully lifted a 7.0 kg bucket of water without breaking (Figure f). After comparing the healing efficiency, healing times, and mechanical strength of the 2-VPSB-WPU polymer with those of reported self-healing polymers (Figure g and Table S4), − it was evident that the mechanical strength of this material was higher in short healing times. Therefore, a balance of highly efficient healing properties and excellent mechanical strength was achieved by the VPSB-WPU vitrimer.…”

Section: Resultsmentioning

confidence: 94%

A Highly Effective Self-Healing Waterborne Polyurethane Vitrimer Containing Conjugated Schiff Base Bonds Driven by Photothermal

Tan,

Zhao,

Zhang

et al. 2024

ACS Appl. Polym. Mater.

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Self-healing materials are the current focus of smart materials research. However, the implementation of self-healing materials remains limited by the challenge of balancing efficient healing properties with high mechanical strength. In this study, N, N′-(4-hydroxy-3-methoxybenzyl) aniline (VPSB) with π−π conjugated structures were prepared by introducing Schiff base bonds between aromatic rings. VPSB is then incorporated into the polyurethane system to synthesize a self-healing waterborne polyurethane vitrimer (VPSB-WPU) containing conjugated aromatic Schiff base bonds. This locally conjugated structure can convert absorbed visible light into thermal energy, which promotes the rapid breaking and formation of Schiff base bonds, resulting in an improved selfhealing effect. The results indicated that the topological network of the vitrimer exhibited an activation energy (E a ) of 60.69 kJ/mol and a freezing transition temperature (T v ) of 45.46 °C. After 3 min of visible-light irradiation, the film temperature increased from 6.4 to 91.5 °C, with a photothermal conversion efficiency of 92.13% and a film scratch-healing efficiency of 93.75%. After 25 min of irradiation, the fractured film's tensile strength after healing was 11.57 MPa. These results demonstrated that VPSB-WPU exhibited vitrimer properties and possessed excellent mechanical strength, photothermal conversion, and self-healing function. A balance between highly efficient healing properties and excellent mechanical strength was achieved by the VPSB-WPU vitrimer, making it highly promising for future applications in material self-healing.

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Section: Resultsmentioning

confidence: 94%

A Highly Effective Self-Healing Waterborne Polyurethane Vitrimer Containing Conjugated Schiff Base Bonds Driven by Photothermal

Tan,

Zhao,

Zhang

et al. 2024

ACS Appl. Polym. Mater.

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Fabrication of Mechanical Strong Supramolecular Waterborne Polyurethane Elastomers With the Inspiration of Hierarchical Dynamic Structures of Scallop Byssal Threads

Zhang,

Wang,

Yang

et al. 2024

Adv Funct Materials

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Advancing the development of eco‐friendly waterborne polyurethane elastomers (WPUEs) can significantly reduce the reliance on organic solvents, which is crucial for environmental conservation. Nevertheless, achieving superior mechanical properties and self‐healing capabilities in WPUEs presents a considerable challenge. Drawing inspiration from the hierarchical dynamic structures observed in scallop byssal threads, a high‐strength supramolecular waterborne polyurethane elastomer (SWPUE), designated SWPU‐DESH‐Zn, is developed in this study. Owing to the precise regulation of the hydrogen bonding state of acylsemicarbazide (ASC) fragments via disulfide bonds, and the formation of coordination interactions between carboxyl and zinc ions, the as‐prepared elastomer exhibited a robust mechanical strength of 52.07 MPa, comparable to that of solvent‐based polyurethane elastomers. Additionally, it exhibited notable self‐healing capability and excellent reprocessability. Meanwhile, high‐performance ionic skins and electromagnetic interference (EMI) shielding materials are also fabricated using SWPU‐DESH‐Zn as the matrix, further illustrating its potential applications. This novel biomimetic approach, inspired by scallop byssal threads, offers valuable insights for designing healable waterborne polymers with enhanced mechanical properties.

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Shape‐memory thermosets: Tailoring the structure for toughness improvement and scratch healability

Nguyen,

Truong,

Nguyen

et al. 2024

Polymer Engineering & Sci

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A straightforward but effective approach to fabricate shape‐memory polyurethane thermosets by tailoring the soft phase composition of two‐ and four‐armed polycaprolactone (PCL) polyols is described. As the crystallization of the PCL soft phase has an effect on driving the self‐assembly of H‐bonds, a good balance of tensile performance and thermo‐healability can be achieved by regulating the ratio between PCL‐diol and PCL‐tetrol in the soft phase. The inferior ability of crystallization of the segments near the branching point gives rise to enhancement of the both overall healability and toughness of the network. Healings of punctured holes and cuts are assessed using optical microscopy (OM), field‐emission scanning electron microscopy (FE‐SEM), tensile analysis, and two‐electrode impedence characterization. The obtained network with the best healing behavior has a soft phase composition with the PCL‐diol/PCL‐tetrol molar ratio of 2/1, a tensile toughness of 64 MPa J−1 and a healing efficiency (estimated by recovery of tensile strength) of nearly 80%.Highlights The composition of the soft phase of polyurethane networks was tailored. Two‐ and four‐armed polycaprolactones were used for the network structure. A good balance between mechanical and healing performance was obtained. Healing of complete cuts showed tensile strength recovery of nearly 80%.

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Tough and Self-Healing Waterborne Polyurethane Elastomers via Dynamic Hydrogen Bonds Design for Flexible Conductive Substrate Applications

Cited by 17 publications

References 49 publications

A Highly Effective Self-Healing Waterborne Polyurethane Vitrimer Containing Conjugated Schiff Base Bonds Driven by Photothermal

A Highly Effective Self-Healing Waterborne Polyurethane Vitrimer Containing Conjugated Schiff Base Bonds Driven by Photothermal

Fabrication of Mechanical Strong Supramolecular Waterborne Polyurethane Elastomers With the Inspiration of Hierarchical Dynamic Structures of Scallop Byssal Threads

Shape‐memory thermosets: Tailoring the structure for toughness improvement and scratch healability

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