High-Strength and Excellent Self-Healing Polyurethane Elastomer Based on Rigid Chain Segment Reinforcement

Macromolecules, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 24, 2025

Owing to their extensive application scope, elastomers that combine high strength and excellent self-healing efficiency have always attracted significant attention are still a contradiction. In this study, novel PU elastomer was prepared by combining rigid poly(amic acid) (PAA) chain segments 3,3-dithiodipropionic dihydrazide (DPH) containing sextuple hydrogen-bonding units disulfide bonds. The exhibited tensile of 50.1 MPa toughness 144.2 MJ/m3. PAA serve as framework, significantly enhancing the mechanical elastomer. Meanwhile, DPH with bonds enabled exhibit an 96.1% after 12 h at 80 °C. Additionally, strong reversible cross-linking arrays in endows it strength, ability, recyclability, allowing be recycled hot pressing dissolution.

Language: Английский

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

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 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.

Language: Английский

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Reversibly Cross‐Linked Plastics Meet Carbon Fibers: Closed‐Loop Recyclable Composites with Enhanced Mechanical Strength and Stability

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 24, 2025

Abstract Efficient recycling of carbon fiber‐reinforced polymer composites (CFRCs) into their original monomers and fibers (CFs) in a non‐destructive manner remains significant challenge. In this study, high‐performance, closed‐loop recyclable aromatic polyamide (APAD) plastics are synthesized via polycondensation amines aldehydes through dynamic imine bonds. Due to fully structure as well interchain hydrogen bonds π–π interactions, APAD exhibit tensile strength ≈78.3 MPa, glass transition temperature ( T g ) ≈200.4 °C, excellent chemical resistance. The can be depolymerized mixture polar organic solvents acids at ambient temperature, enabling high‐purity recovery precipitation selective solvents. Water‐resistant CF/APAD fabricated complexation with CF cloths. These mechanical properties comparable those CF/epoxy thermoset superior thermal stability. mild depolymerization conditions for enable the efficient disintegration composites. Therefore, CFs realized. recovered cloths used re‐manufacture This study presents an effective method CFRCs, offering environmental economic benefits.

Language: Английский

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Carbon Fiber Reinforced Thermoplastics: From Materials to Manufacturing and Applications

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 22, 2025

Abstract Carbon fiber reinforced thermoplastics (CFRTs) have witnessed a resurgence in recent times since their first industrial use over five decades ago, with revitalized interest from aerospace companies and other key sectors including energy automotive sectors. CFRTs are increasingly gaining footholds high volume rapid manufacturing nonaerospace owing to inherent recyclability. However, there has been lack of contemporary critical review on this topic so far. This work aims the advances emphasis performance thermoplastics. Both continuous discontinuous forms tape, organosheet short/long architectures discussed, processing postprocessing methods reviewed, state‐of‐the‐art welding techniques. Typical applications industry examined, fuselage, pressure vessel, components. Finally, insights provided into ongoing challenges, future development, roadmap for expediting development high‐performance CFRTs.

Language: Английский

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Design of high impact-resistant PBO fiber/epoxy vitrimer composites: Multi-scale energy dissipation strategy

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: 505, P. 159215 - 159215

Published: Jan. 2, 2025

Language: Английский

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Ring‐Toughened Polymer Networks: The Mighty Impact of Specially Designed Rings on Mechanical Properties

Chemistry - A European Journal, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

Abstract Polymer network materials are gaining significance in daily life and industrial applications. Improving polymer materials’ mechanical properties has long been a focus for chemists scientists. Generally, rings networks viewed as adverse elements leading to reduced performance. In this conceptual article, recent advancements related strategies utilizing specially designed enhance the of summarized discussed. The article concludes by discussing current challenges future prospects field. We aim offer readers an overview ring‐toughened catalyze swift progress burgeoning area.

Language: Английский

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Enhanced Multifunction in Polyurethane Elastomers via Regulation of Triple‐Crosslinked Network With Dynamic Covalent and Noncovalent Bonds

Journal of Applied Polymer Science, Journal Year: 2025, Volume and Issue: unknown

Published: March 12, 2025

ABSTRACT Self‐healing polyurethane elastomers with dynamic crosslinking networks are promising candidates for intelligent next‐generation coatings. However, their constitutive relation shows conflicts between high mechanical performance and room‐temperature self‐healing, as well recyclability. Here, a regulation strategy of triple‐crosslinked network in the hard domain was proposed to achieve multifunction enhancement via covalent borate ester bonds coupling noncovalent. The distribution ratio bonds, boron‐nitrogen coordination multiple hydrogen were meticulously designed balance fracture reconstruction molecular network. introduced enabled basic self‐healing through molecule‐level topological evolution. abundant provided external noncovalent reversible networks, thus improving tensile strength toughness physical points. obtained exhibited impressive light transmittance 93%, 41.07 MPa, elongation at break 1673.20%, 166.74 MJ m −3 , almost entirely 48 h. These even maintained 90% original properties after suffering three recycles. This may promote practical application coatings automobile flexible electronic industry.

Language: Английский

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Reprocessable bio-based rubber with hierarchical hydrogen bonding: A sustainable solution for high strength, superior extensibility, and recyclability

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 161857 - 161857

Published: March 1, 2025

Language: Английский

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Pangolin Scale Inspired Healable, Recyclable, and Mechanically Robust Supramolecular Waterborne Polymer Networks

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 31, 2025

Abstract Although healable waterborne polymers have attracted significant attention in recent years due to their environmentally friendly properties, the inferior mechanical properties still hinder further propagation. Inspired by micro‐structure of pangolin scales, herein, a novel supramolecular polymer network (SWPN) named SWPUMA‐SPPEK10 is proposed this study. This fabricated complexing sulfonated poly(phthalazinone ether ketone) (SPPEK) with acylsemicarbazide (ASC) containing cationic polyurethane (SWPUMA) an aqueous solution followed hot‐pressing process. Due synergistic effects ASC, electrostatic interactions, and SPPEK nanoparticles, exhibited remarkable tensile strength 55.19 MPa, toughness 305.93 MJ m −3 . The rich dynamic interactions within chains also imparted it excellent healability recyclability. biomimetic structural design provides new insight for constructing high‐performance robust recyclability, which may play critical role mitigating global environmental pollution.

Language: Английский

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Highly Tear-Resistant Recyclable Carbon Fiber Reinforced Composites Relying on Woven Cross-Linked Polyurethanes

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: April 8, 2025

The poor ductility and irreversible properties of covalently cross-linked polymers result in carbon fiber-reinforced polymer composites (CFRPs) with low tear resistance nonrecyclability. In this work, a flexible woven polyurethane (WPPNn) prepared via cross-linker was used for the first time as binder CFRPs. WPPN2000 exhibited an ultrahigh strength 50.4 MPa, toughness 267.2 MJ m-3, excellent fracture energy (211.6 kJ m-2). Simulation results characterization tests confirmed high dissipation network. WPPN2000-CF achieved 1004.5 m-2, which is 16.4 times higher than that epoxy-CF (61.2 addition, due to dynamic nature cross-linking, fiber can be recovered nondestructively using solvent. cross-linking strategy provided new ideas design adhesives.

Language: Английский

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