Intrinsically Self-Healing Polymers: From Mechanistic Insight to Current Challenges

Chemical Reviews, Journal Year: 2022, Volume and Issue: 123(2), P. 701 - 735

Published: Dec. 28, 2022

Self-healing materials open new prospects for more sustainable technologies with improved material performance and devices' longevity. We present an overview of the recent developments in field intrinsically self-healing polymers, broad class based mostly on polymers dynamic covalent noncovalent bonds. describe current models mechanisms discuss several examples systems different types bonds, from various hydrogen bonds to The advances indicate that most intriguing results are obtained have combined These demonstrate high toughness along a relatively fast rate. There is clear trade-off relationship between rate mechanical modulus materials, we propose design principles toward surpassing this trade-off. also applications summarize challenges field. This review intends provide guidance intrinsic required properties.

Language: Английский

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Extremely Strong and Tough Biodegradable Poly(urethane) Elastomers with Unprecedented Crack Tolerance via Hierarchical Hydrogen‐Bonding Interactions

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(21)

Published: Feb. 23, 2023

The elastomers with the combination of high strength and toughness have always been intensively pursued due to their diverse applications. Biomedical applications frequently require biodegradability biocompatibility properties. It remains a great challenge prepare biodegradable extremely robust mechanical properties for in vivo use. In this report, we present polyurethane elastomer unprecedented application as hernia patches, which was obtained by solvent-free reaction polycaprolactone (PCL) isophorone diisocyanate (IPDI) N,N-bis(2-hydroxyethyl)oxamide (BHO) chain extender. Abundant hierarchical hydrogen-bonding interactions inside hinder crystallization PCL segments facilitate formation uniformly distributed hard phase microdomains, miraculously realize fracture 92.2 MPa true stress 1.9 GPa, while maintaining elongation-at-break ≈1900% ultrahigh 480.2 MJ m-3 energy 322.2 kJ m-2 . Hernia patches made from via 3D printing technology exhibit outstanding properties, biocompatibility, biodegradability. demonstrate considerable potentials

Language: Английский

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Fatigue-free artificial ionic skin toughened by self-healable elastic nanomesh

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: July 29, 2022

Abstract Robust ionic sensing materials that are both fatigue-resistant and self-healable like human skin essential for soft electronics robotics with extended service life. However, most existing artificial skins produced on the basis of network reconfiguration suffer from a low fatigue threshold due to easy fracture low-energy amorphous polymer chains susceptible crack propagation. Here we engineer fatigue-free yet fully healable hybrid toughened by high-energy, elastic nanomesh, resembling repairable nanofibrous interwoven structure skin. Such design affords superhigh 2950 J m −2 while maintaining skin-like compliance, stretchability, strain-adaptive stiffening response. Moreover, nanofiber tension-induced moisture breathing matrix leads record-high strain-sensing gauge factor 66.8, far exceeding previous intrinsically stretchable conductors. This concept creates opportunities designing durable ion-conducting replicate unparalleled combinatory properties natural more precisely.

Language: Английский

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Self-healing polyurethane with high strength and toughness based on a dynamic chemical strategy

Journal of Materials Chemistry A, Journal Year: 2022, Volume and Issue: 10(18), P. 10139 - 10149

Published: Jan. 1, 2022

Menthane diamine promotes the strength and toughness of H-bonding disulfide bonding-based self-healing polyurethane elastomers simultaneously improves elasticity performance.

Language: Английский

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Spider Silk‐Inspired Artificial Fibers

Advanced Science, Journal Year: 2021, Volume and Issue: 9(5)

Published: Dec. 19, 2021

Spider silk is a natural polymeric fiber with high tensile strength, toughness, and has distinct thermal, optical, biocompatible properties. The mechanical properties of spider are ascribed to its hierarchical structure, including primary secondary structures the spidroins (spider proteins), nanofibril, "core-shell", "nano-fishnet" structures. In addition, also exhibits remarkable regarding humidity/water response, water collection, light transmission, thermal conductance, shape-memory effect. This motivates researchers prepare artificial functional fibers mimicking silk. this review, authors summarize study structure silk, biomimetic preparation from different types molecules polymers by taking some examples exhibiting these interesting conclusion, studies have yielded several noteworthy findings in functions, review aims provide indications for that approach exceed

Language: Английский

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Ultrafast Fabrication of Lignin-Encapsulated Silica Nanoparticles Reinforced Conductive Hydrogels with High Elasticity and Self-Adhesion for Strain Sensors

Chemistry of Materials, Journal Year: 2022, Volume and Issue: 34(11), P. 5258 - 5272

Published: June 2, 2022

Conductive hydrogels are receiving considerable attention because of their important applications, such as flexible wearable electronic, human-machine interfaces, and smart/soft robotics. However, the insufficient mechanical performance inferior adhesive capability severely hinder potential applications in an emerging field. Herein, a highly elastic conductive hydrogel that integrated robustness, self-adhesiveness, UV-filtering, stable electrical was achieved by synergistic effect sulfonated lignin-coated silica nanoparticles (LSNs), polyacrylamide (PAM) chains, ferric ions (Fe3+). In detail, dynamic redox reaction constructed between catechol groups LSNs Fe3+, which could promote rapid gelation acrylamide (AM) monomers 60 s. The optimized containing 1.5 wt % junction points exhibited excellent elasticity (<15% hysteresis ratio), high stretchability (∼1100% elongation), improved robustness (tensile compressive strength ∼180 kPa ∼480 kPa). Notably, abundant endowed with long-lasting robust self-adhesion, enabling seamless adhesion to human skin. Meanwhile, also provided exceptional UV-blocking (∼95.1%) for hydrogels. combined advantages were manifested sensors high-fidelity detection various deformations over wide range strain (10–200%) good repeatability stability. We believed designed may become promising candidate material future electronics long-term movements monitoring.

Language: Английский

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Ultrahigh Mechanical Strength and Robust Room-Temperature Self-Healing Properties of a Polyurethane–Graphene Oxide Network Resulting from Multiple Dynamic Bonds

ACS Nano, Journal Year: 2022, Volume and Issue: 16(10), P. 16724 - 16735

Published: Oct. 10, 2022

Addressing the conflict between achieving high mechanical properties and room-temperature self-healing ability is extremely significant to a breakthrough in application of materials. Therefore, inspired by natural spider silk nacre, supramolecular material with ultrahigh strength toughness developed synergistically incorporating flexible disulfide bonds dynamic sextuple hydrogen (H-bonds) into polyurethanes (PUs). Simultaneously, abundant H-bonds are introduced at interface graphene oxide nanosheets multiple PU matrix afford strong interfacial interactions. The resulting urea-containing an inverse artificial nacre structure has record (78.3 MPa) (505.7 MJ m-3), superior tensile (1273.2% elongation break), rapid abilities (88.6% 25 °C for 24 h), forming strongest elastomer reported date thus upending previous understanding traditional In addition, this bionic PU-graphene network endows fabricated intelligent robot functional repair shape memory capabilities, providing prospects fabrication devices.

Language: Английский

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Engineering of Chain Rigidity and Hydrogen Bond Cross‐Linking toward Ultra‐Strong, Healable, Recyclable, and Water‐Resistant Elastomers

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(21)

Published: Feb. 28, 2023

High-performance elastomers have gained significant interest because of their wide applications in industry and our daily life. However, it remains a great challenge to fabricate simultaneously integrating ultra-high mechanical strength, toughness, excellent healing recycling capacities. In this study, ultra-strong, healable, recyclable are fabricated by dynamically cross-linking copolymers composed rigid polyimide (PI) segments soft poly(urea-urethane) (PUU) with hydrogen bonds. The elastomers, which denoted as PIPUU, record-high tensile strength ≈142 MPa an extremely high toughness ≈527 MJ m-3 . structure the PIPUU elastomer contains hydrogen-bond-cross-linked elastic matrix homogenously dispersed nanostructures. PI self-assemble generate phase-separated nanostructures that serve nanofillers significantly strengthen elastomers. Meanwhile, is PUU cross-linked reversible bonds, largely enhance elastomer. can be healed recycled restore original strength. Moreover, performance hydrophobic segments, scratch-, puncture-, water-resistant.

Language: Английский

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Multiple Structure Reconstruction by Dual Dynamic Crosslinking Strategy Inducing Self‐Reinforcing and Toughening the Polyurethane/Nanocellulose Elastomers

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(12)

Published: Jan. 15, 2023

Abstract High‐performance elastomers are expected to possess excellent healing and recycling ability, damage resistance in conjunction with high strength toughness. Herein, a dual dynamic crosslinking strategy is implemented by multiple hydrogen disulfide bonds obtain novel amorphous transparent polyurethane/nanocellulose elastomer self‐healing, self‐reinforcing toughening performance. First, introduced TEMPO‐oxidized cellulose nanofibers (TCNF) modification 2‐ureido‐4[1H]‐pyrimidone (UTCNF), while (SS) the polyurethane (PU) main chain, leading formation of cross‐linking networks. The PU‐SS‐UTCNF can fully self‐heal within 4.0 h at 50 °C. Surprisingly, for first time, also self‐strengthens self‐toughens after hot‐pressing, tensile toughness that increase up 401% 257% compared original samples, 50.0 MPa 132.5 MJ m ‐3 . self‐strength self‐toughening effects attributed 1) reconstruction networks degree during hot‐pressing processes; 2) system beneficial orientation highly crystallized UTCNF, as replacement stress‐induced process deformation under external force.

Language: Английский

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Strong and Tough Supramolecular Covalent Adaptable Networks with Room‐Temperature Closed‐Loop Recyclability

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(7)

Published: Nov. 11, 2022

Development of closed-loop chemically recyclable plastics (CCRPs) that can be widely used in daily life a fundamental solution to the global plastic waste crisis. Hence, it is great significance develop easy-to-recycle CCRPs possess superior or comparable material properties commodity plastics. Here, novel dual crosslinked CCRP, namely, supramolecular covalent adaptable networks (supra-CANs), reported, which not only displays mechanical higher than strong and tough polycarbonate, but also exhibits excellent solvent resistance as thermosets. The supra-CANs are constructed by introducing reversible noncovalent crosslinks into dynamic polymer networks, resulting highly stiff thermosets exhibit thermoplastic-like ductile behaviors well reprocessability rehealability. In contrast, analogs do have (CANs) show elastomeric with significantly decreased strength. Importantly, developed CANs converted back initial monomers high yields purity at room temperature, even additives, enables sustainable polymer-monomer-polymer circulation. This work provides new design principles for high-performance polymers substitutes conventional

Language: Английский

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