Recent Advances of Auxetic Metamaterials in Smart Materials and Structural Systems

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 26, 2025

Abstract Auxetic metamaterials refer to materials and structures with extraordinary deformation, i.e., transverse expansion (contraction) under uniaxial tension (compression). In recent decades, a very wide range of innovative functional performance has been discovered stemming from this behavior. This desirable exhibition adaptivity, programmability, functionality provides great potential in soft intelligent systems. However, thus far, the mainstream research on auxetic focused subjective design, monotonic mechanical properties, passive tunability. review thorough overview classical properties applications, primary objective proposing new roadmap auxetics for advances interdisciplinary field. The fundamental works are categorized different configurations mechanisms. particular, integration shape morphing, actuation, sensing, multiphysical response, inverse design is reviewed detail. To accelerate development smart structural systems, applications generalized into robotics (outside body), human–machine interaction (surrounding healthcare devices (inside body). Finally, several significant topics emphasized theory, material choice, manufacturing technique, applications.

Язык: Английский

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Vanillin-Based Polyol Combined with Castor Oil to Fabricate Water-Borne Polyurethane with Recyclability and Self-Healing Properties for Fluorescent Ink and Flexible Sensor Applications

ACS Sustainable Chemistry & Engineering, Год журнала: 2024, Номер 12(46), С. 16834 - 16846

Опубликована: Ноя. 2, 2024

The development of environmentally friendly WPUs with sustainable biobased feedstock, repairability, recyclability, and multifunctionality is highly attractive desirable. Herein, a vanillin-based polyol (VP) containing dynamic Schiff base bonds was synthesized via one-step reaction. rigid VP combined flexible castor oil, acting as polyols, to produce waterborne polyurethanes (BWPU). obtained BWPU material simultaneously possessed tunable mechanical properties (tensile strength up 11.49 MPa, elongation at break reached 169.04%), high thermal stability (T5 > 240 °C), self-healing (20 min 150 remolding (3 h chemical degradation (1 mol/L HCl solution), demonstrating excellent in-service performance an closed-loop recycling feature. Interestingly, the exhibited obvious fluorescent properties, which can be used ink for information security. Furthermore, by incorporating conductive Ag nanowires, potential application wearable sensors explored, prepared AgNW/BWPU pressure sensitive sensing ability quick responsiveness (100 ms), monitor both subtle movements large human movements. This work provides strategy achieving repairable recyclable fluorescence properties.

Язык: Английский

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In Situ Anchoring Functional Molecules to Polymer Chains Through Supramolecular Interactions for a Robust and Self‐Healing Multifunctional Waterborne Polyurethane

Small, Год журнала: 2025, Номер unknown

Опубликована: Янв. 22, 2025

Abstract Nowadays, much attention is paid to the development of high‐performance and multifunctional materials, but it still a great challenge obtain polymer materials with high mechanical properties, self‐healing multifunctionality in one. Herein, an innovative strategy proposed satisfactory waterborne polyurethane (PMWPU‐Bx) by situ anchoring 3‐aminophenylboronic acid (3‐APBA) pyrene‐capped (PMWPU) via supramolecular interactions. The multiple functional sites inherent 3‐APBA can produce interactions groups on PMWPU, promoting aggregation hard domains network, which confers PMWPU‐Bx strength (7.9 MPa) modulus (243.2 MPa). Meanwhile, dynamic natures boronic ester bonds formed condensation endow efficiency. Additionally, exhibits fluorescence tunability due controlled π–π stacking. In this research, molecules onto polymers through synchronously achieves performance multi‐functionality polyurethanes, also broadens their potential applications fields optical anticounterfeiting encrypted information transmission.

Язык: Английский

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Muscle‐Inspired Super‐Flexible Phase Change Materials with Programmable Deformation for Photothermal Actuation

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Дек. 13, 2024

Abstract Phase change materials (PCMs) with remarkable latent heat storage/release capacity have demonstrated prominent advantages in energy conservation and efficient thermal management. Nevertheless, simultaneously achieving high storage capacity, excellent toughness, flexibility PCMs is a significant challenge for programmable deformations when used complex environmental scenarios. A flexible PCM reported deformation constructed through three‐dimensional (3D) dynamic cross‐linked network. This approach has culminated the development of homogeneously self‐supporting polyurethane‐based solid‐solid graphene enhancement, which exhibits exceptional properties (∆ H m = 105.3 J g −1 , ∆ c 105.0 ), toughness ( ε 1543%, σ 19.2 MPa), flexibility, shape memory behavior R r 90.3%). Notably, subjected to photothermal stimulation, it can lift objects weighing more than 2620 times their weight, presenting working density 1330 kJ −3 . PCM, possesses photothermal‐driven performance, opens new pathway artificial muscles or soft robots requirements management

Язык: Английский

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Chemodynamic covalent adaptable network-induced robust, self-healing, and degradable fluorescent elastomers for multicolor information encryption

Chemical Science, Год журнала: 2024, Номер unknown

Опубликована: Дек. 30, 2024

Demonstration of a high-strength, self-healing, degradable, and luminescent elastomer induced by chemodynamic covalent adaptation network.

Язык: Английский

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Inducing ultra-small phase region in the matrix to form hard elastic scattering-fluorescent luminescent solar concentrator for self-powered greenhouse

Chemical Engineering Journal, Год журнала: 2025, Номер unknown, С. 162740 - 162740

Опубликована: Апрель 1, 2025

Язык: Английский

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Polymerization Kinetics Optimization for Synthesizing Biobased Long Carbon‐Chain Polyamide Elastomers With Tunable Hardness and Mechanical Properties

Journal of Applied Polymer Science, Год журнала: 2025, Номер unknown

Опубликована: Май 11, 2025

ABSTRACT Biomass‐based long carbon‐chain polyamide elastomers (LCPAEs) have attracted widespread attention due to their favorable physical and mechanical properties, excellent flexibility, good heat resistance, so on. However, the precise structure molecular weight control of (LCPA) hard segments remains underexplored, yet is pivotal for fabricating high‐performance LCAPEs. Herein, effects temperature time on polymerization dicarboxylic‐terminated 1010 prepolymer (PA1010dC) are detailedly studied by end‐group titration technique, reaction kinetic equation PA1010dC prepolymerization stage established. By optimizing process based parameters, different with ideal chemical structures weights (ca. 500 ~ 2700 g·mol −1 ) obtained. Subsequently, a series LCPAEs various wholly‐biobased segment contents successfully prepared via polycondensation polytetramethylene ether glycol (PTMG) soft segments. The resulting show comprehensive properties that can be tuned orientationally varying relative content Their Shore hardness, tensile strength, elongation at break varied within 20–55 D, 13–45 MPa, 340%–1080%, respectively. This work provides facile method efficient stable preparation LCPA corresponding biomass LCPAEs.

Язык: Английский

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Bioinspired Integrated Auxetic Conductive Elastomer Composite With High Stretchability and Robust Interface

Small, Год журнала: 2025, Номер unknown

Опубликована: Май 12, 2025

Abstract Auxetic conductive elastomers (ACEs) are appealing due to their unique negative Poisson's ratio (NPR) effects. Nevertheless, conventional ACEs often produced by the creation of geometric structures through pore‐forming techniques on elastomers, which substantially compromise mechanical and performance. Inspired composite structure skin comprising collagen fibers elastin, this study reports an integrated auxetic elastomer (IACE) composing a high‐modulus as skeleton low‐modulus soft matrix. Benefitting from covalent interlinkages topological entanglements at skeleton‐matrix interface, IACE is flat void‐free with no abrupt soft‐to‐hard transition. Compared alone, exhibits enhanced properties, including fracture stress 2.6 MPa, elongation break 457%, toughness 7.2 MJ m −3 . Furthermore, its behavior NPR effect consistently observed across wide strain range 0–85%. Leveraging ion transport pathway enabled deformation, demonstrates reliable sensing performance improved sensitivity over broad deformation range. This work presents promising strategy for developing robust interface strain, advancing potentials in intelligent flexible electronics.

Язык: Английский

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Capturing Robust and Tough Thermoplastic Polyurethane Elastomers via Engineering Dual-Phase Evolution Rather than Chain Extenders

ACS Materials Letters, Год журнала: 2025, Номер unknown, С. 2238 - 2245

Опубликована: Май 14, 2025

Язык: Английский

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Bioinspired mechanically tough, high Adhesion, and healable polyurethane coating for high-temperature anti-corrosion and anti-cavitation applications

Applied Surface Science, Год журнала: 2025, Номер unknown, С. 163584 - 163584

Опубликована: Май 1, 2025

Язык: Английский

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