Double crosslinked networks waterborne polyurethane with self-healing, recyclable and antibacterial functions based on dynamic bonds and used for temperature/light sensor

Zeng, Wenhua; Jin, Yong; Zhou, Rong; Li, Yupeng; Chen, Haonan

doi:10.1016/j.cej.2024.148994

Cited by 18 publications

(1 citation statement)

References 45 publications

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“…These results strongly demonstrate that visible light can be used to excite the self-healing program of VPSB-WPU. Therefore, we inferred that long-chain conjugated compounds with dynamic covalent bonds exhibited a certain stimulus-response after absorbing visible light, similar to the ditelluride, diselenide, and disulfide. − …”

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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Engineered Functional Segments Enabled Mechanically Robust, Intrinsically Fire‐Retardant, Switchable, Degradable PolyureThane Adhesives

Xue,

Zhang,

Huo

et al. 2024

Adv Funct Materials

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Adhesives are being used ubiquitously, such as automotive, building, electronics, and beyond. Due to the lack of rational design strategies, they have yet to achieve a performance portfolio: mechanically robust, highly adhesive, fire‐retardant, switchable, and sustainable (e.g., biobased, reusable, biodegradable) to ensure their practical applications. Herein, a fire‐retardant phosphorus‐containing pimaric acid bio‐derivative, AD, as functional segments, is rationally engineered to prepare biobased polyurethane (PU) adhesive that realizes such an integrated performance portfolio. Because of dynamic hydrogen‐bonding and π–π stacking of polar AD, the as‐prepared PU adhesive exhibits an ultrahigh adhesion force of 38.8 N cm–1. As‐prepared adhesive can be readily reused benefiting from its good solubility in ethanol and exhibits temperature‐responsive switchable adhesion without degraded adhesion. Also, the adhesive shows intrinsic fire retardance due to its biphasic modes of action. The labile ester bonds in the structure enable the adhesive to completely degrade in the presence of lipase or dilute acid. Further demonstration of its promising applications as an adhesive for nanocomposite heat dissipators shows superior dissipating efficiencies to commercial heat sinks. This work offers a novel design approach for creating next‐generation sustainable high‐performance adhesives with functional integration and circular life cycles, which are anticipated to find extensive real‐world applications.

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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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Double crosslinked networks waterborne polyurethane with self-healing, recyclable and antibacterial functions based on dynamic bonds and used for temperature/light sensor

Cited by 18 publications

References 45 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

Engineered Functional Segments Enabled Mechanically Robust, Intrinsically Fire‐Retardant, Switchable, Degradable PolyureThane Adhesives

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

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