Hybrid Soft Segments Boost the Development of Ultratough Thermoplastic Elastomers with Tunable Hardness

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 19, 2025

Abstract The hardness of thermoplastic elastomers (TPEs) significantly influences their suitability for various applications, but traditionally, enhancing reduces toughness. Herein a method is introduced that leverages hybrid soft segments to fine‐tune the TPEs without compromising exceptional Through selective copolymerization polytetramethylene ether glycols (PTMEGs) at molecular weights, supramolecular poly(urethane‐urea) are molecularly engineered cover wide spectrum while retaining good It achieved through formation graded functional zones—densely packed enhanced and strength, loosely greater extensibility toughness—driven by variations in PTMEG chain length mismatched interactions. establishment systematic investigation TPE library, intricate interplay between design, structure, performance these materials elucidated, refining optimization techniques. demonstrate mechanical properties, including variant with Shore 86A toughness 819 MJ m −3 , alongside softer 59A 786 innovation extends scalable solvent‐based production line, promising widespread industrial application. This advancement reimagines potential high‐performance composites, offering versatile demanding applications.

Язык: Английский

---

Jellyfish‐inspired Polyurea Ionogel with Mechanical Robustness, Self‐Healing, and Fluorescence Enabled by Hyperbranched Cluster Aggregates

Angewandte Chemie International Edition, Год журнала: 2024, Номер unknown

Опубликована: Авг. 23, 2024

Ionogels are promising for soft iontronics, with their network structure playing a pivotal role in determining performance and potential applications. However, simultaneously achieving mechanical toughness, low hysteresis, self-healing, fluorescence using existing structures is challenging. Drawing inspiration from jellyfish, we propose novel hierarchical crosslinking design situ formation of hyperbranched cluster aggregates (HCA) to fabricate polyurea ionogels overcome these challenges. Leveraging the disparate reactivity isocyanate groups, induce HCA through competing reactions, enhancing toughness imparting clustering-triggered emission ionogel. This synergy between supramolecular interactions plasticizing effect ionic liquid leads reduced hysteresis Furthermore, incorporation NCO-terminated prepolymer dynamic oxime-urethane bonds (NPU) enables self-healing enhances stretchability. Our investigations highlight significant influence on ionogel performance, showcasing robustness including high strength (3.5 MPa), exceptional (5.5 MJ m

Язык: Английский

---

Hierarchical H-bonding and metal coordination bonds enabled supramolecular dual networks for high-performance energy-dissipation

Chemical Engineering Journal, Год журнала: 2024, Номер 498, С. 155414 - 155414

Опубликована: Сен. 1, 2024

Язык: Английский

---

Supramolecular Organic Nanofiller: A New Reinforcement Strategy for Dynamic Covalent Polymer Networks Toward Upcycling of Carbon Fiber Composites

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 22, 2025

Abstract Dynamic covalent polymer networks (DCPN) provide an important solution to the challenging recyclability of thermoset elastomers. However, dynamic bonds exhibit relatively weak bond energies, considerably decreasing mechanical properties DCPN. Herein, a novel reinforcement strategy for DCPN involving in situ formation supramolecular organic nanofillers through asynchronous polymerization is proposed. Owing difference reactivity isocyanate groups and gradual deblocking aldimine, cross‐linking hexamethylene diisocyanate isocyanate‐terminated prepolymer containing oxime–urethane with deblocked tris(2‐aminoethyl)amine facilitates transition from molecular interpenetration chains into immiscible polymerization. This results thermodynamic incompatibility between hyperbranched clusters long chains, inducing spontaneous nanofillers. Compared traditional strategies, improve Furthermore, interactions enable network excellent recyclability. The unique prepared allow their combination carbon fibers (CF) form CF composites outstanding personal‐protection applications, achieving composite upcycling. study offers on upcycling high‐performance composites.

Язык: Английский

---

Structure–Property Relationships of Elastomeric Vinylogous Urethane Thermosets and Their Application as Closed-Loop Recyclable Strain Sensors

Macromolecules, Год журнала: 2025, Номер 58(4), С. 1923 - 1934

Опубликована: Фев. 5, 2025

Developing closed-loop recyclable thermosets and understanding their structure–property relationships are essential steps in advancing a circular materials economy. Here, we present vinylogous urethane (VU) thermoset with recyclability, synthesized through the reaction of polytetrahydrofuran bisacetoacetate (aPTHF) tris(2-aminoethyl)amine (TREN). These VU polymers exhibit high elasticity, only 3–9% residual strain observed after cyclic tensile testing at maximum 100%, depending on molecular weight aPTHF network cross-link density. The two structural parameters also allow modulation mechanical stress-relaxation properties elastomers. To investigate hydrolysis linkages within hydrophobic matrix, employed heterogeneous system using biphasic mixture HCl CDCl3. Our findings show that VUs remain stable pure water but can be dissociated under acidic conditions, dissociation rate accelerated higher temperatures and/or presence concentrations. detailed investigations indicate potential elastomers as sustainable substrates for wearable sensors. We therefore conduct case study synthesizing sensor incorporation multiwalled carbon nanotubes (MCNs) into elastomer matrix. robustly detect various movements. Moreover, treatment both neat polymer composite diethyl ether solvent allows excellent recovery (>90%) TREN (86%), without discernible damage to MCNs reclaimed from latter.

Язык: Английский

---

Dragonfly Wing‐Inspired Reticular Hierarchical Structure Enables Strong and Tough Supramolecular Elastomers

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 1, 2025

Abstract Dragonfly wings possess exceptionally high strength, toughness, and fatigue resistance due to their unique hierarchical structure from the micro macro scale. Inspired by this, mismatched supramolecular interactions (MMSIs) are introduced into dynamic acylsemicarbazide groups, constructing an interconnected hybrid network of soft hard segments in SPUU‐DS elastomer. This design, featuring a dense array hydrogen bonds, achieves exceptional mechanical properties: true stress at breaks 1.1 GPa comparable that typical spider silk (0.8–1.5 GPa); toughness 325.54 MJ m −3 , twice (≈160 ); fracture energy 232.83 kJ −2 surpassing many metals alloys. Furthermore, monitoring device with “hamburger” is developed integrating conductive graphene film. When placed inside tire, this enhances tire's puncture approximately twofold. By correlating signals angles, system enables detection damage various locations on allowing for timely repair preventing traffic accidents. novel biomimetic approach, inspired dragonfly wings, provides valuable insights designing healable elastomers superior properties.

Язык: Английский

---

Self-Healed, Tough, and Highly Resilient Elastomer Facilitated by Cooperative Hydrogen-Bonding Interaction and π–π Stacking Interaction

ACS Applied Polymer Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 17, 2025

High-strength self-healing polyurethane elastomers offer great potential across various application fields due to their excellent combination of toughness, elasticity, and autonomous damage repair. However, achieving an optimal balance between capabilities robust mechanical performance remains a significant challenge. In this study, we developed composite elastomer (PU-10% CNC) with enhanced properties by incorporating cellulose nanocrystals (CNCs) through solvent replacement process. This approach facilitates the uniform dispersion CNCs within elastomer, resulting in material that leverages abundant hydrogen-bonding π–π stacking interactions. Consequently, these supermolecular interactions collectively impart efficiency (91.8%) at room temperature. The introduction CNC, its numerous hydroxyl groups, formation multiple hydrogen bonds, acting as reinforcing points significantly improve tensile strength from 3.5 24.6 MPa while also enhancing resilience. Moreover, is fully recyclable via chemical routes, offering environmentally friendly solution for high-performance elastomers.

Язык: Английский

---

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

---

Lignin-carbohydrate complex-based polyurethane elastomer with outstanding mechanical strength, photothermal efficiency, and enhanced recyclability

Chemical Engineering Journal, Год журнала: 2024, Номер unknown, С. 156187 - 156187

Опубликована: Сен. 1, 2024

Язык: Английский

---

Healable, Recyclable, and Upcyclable Gel Membranes for Efficient Carbon Dioxide Separation

Angewandte Chemie International Edition, Год журнала: 2024, Номер unknown

Опубликована: Июль 25, 2024

Ionic liquids (ILs) are prized for their selective dissolution of carbon dioxide (CO

Язык: Английский

---