Construction of Smart Coatings Containing Core–Shell Nanofibers with Self-Healing and Active Corrosion Protection

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(32), P. 42748 - 42761

Published: July 31, 2024

With increasingly severe metal corrosion, coating preparation with high-performance corrosion protection has attracted more attention. Herein, the encapsulation of inhibitor 8-hydroxyquinoline (8-HQ) as well self-healing agent linseed oil (LO) in polyvinyl alcohol (PVA) and chitosan (CS) shells were realized by coaxial electrospinning, which was recorded PVA/CS@LO/8-HQ core–shell nanofibers. nanofibers employed to promote epoxy coating. The anticorrosion mechanism that change local pH on surface stimulated release 8-HQ from nanofibers, then chelated iron ions form a complex. When cracks occurred caused rupture LO released reacted oxygen cure them so could be healed autonomously. dynamic potential polarization curves showed inhibition efficiency compound + reached 87.54%, 90.31%, 85.57% at = 3, 7, 11, respectively, higher than single inhibitor. Density functional theory calculations revealed combination, forming hydrogen bond interaction, promoted adsorption inhibitors steel surface. Scanning Kelvin probe electrochemical impedance spectroscopy proved properties These results demonstrated embedding obtain properties, mechanical

Language: Английский

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Study on Self‐Healing Technology of Epoxy Resin for Insulator Core Rods

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

Published: Feb. 24, 2025

ABSTRACT Epoxy resin insulation materials are prone to micro‐damage such as scratches and electrical treeing, which can lead a decline in performance threaten the safe operation of entire system. Microcapsule‐based self‐healing technology is one most promising solutions address issues epoxy resin. However, research has shown that when microcapsule doping concentration exceeds 3 wt%, mechanical strength decreases significantly, while too low affects healing efficiency. This paper focuses on used insulator core rods addresses contradiction between “low introduction” “high efficiency.” work synthesizes magnetically targeted UV‐sensitive microcapsules suitable for rods. During curing process resin, be directionally guided by magnetic field distribute areas damage, thereby ensuring repair efficiency reducing quantity used. The shells possess UV‐shielding properties, stability internal material. When damage propagates capsules, material flows out cures under UV light, completing damage. Additionally, larger‐scale rod specimens were fabricated, demonstrating excellent against scratch treeing In comparison, composite without exhibited reduction tensile breakdown 69.06% 74.77%, respectively, after Post‐repair, recovery rate reached 91.6%, achieved 90.4%.

Language: Английский

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Exploring Self‐Repair Capabilities of ATSP Vitrimers for Crack Mitigation in Aerospace Applications

Macromolecular Materials and Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 7, 2025

Abstract Vitrimers, although categorized as thermosetting polymers, differ from traditional ones in that their thermally induced crosslinks undergo reconfiguration through covalent bond exchanges response to thermal stimuli. Exchangeable bonds present significant and distinctive advantages for thermoset‐based aerospace composites, facilitating capabilities such self‐repair crack arrest molecular bridging. In this work, the self‐healing behavior of four different blends Aromatic Thermosetting Copolyester (ATSP) coatings, which are high‐performance vitrimer is tested by introducing micro‐scratches on surface healing them at higher temperatures. three blends, scratches completely healed indicating complete repair. This property ATSP coatings can be useful extreme conditions where micro‐cracks lead failure. The ability vitrimers discussed terms mechanical properties morphological parameters branch density.

Language: Английский

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Natural light‐triggered microcapsules for non‐contact and autonomous healing of surface damages on insulating materials

Journal of Applied Polymer Science, Journal Year: 2024, Volume and Issue: 141(44)

Published: Aug. 21, 2024

Abstract In the process of curing or service, epoxy resin is prone to crack damage due complex stress, resulting in material performance degradation and other catastrophic accidents. Self‐healing microcapsules offer an effective strategy address aforementioned issues enhance long‐term durability materials. However, traditional face challenges achieving non‐contact repair, as healing agent requires high temperature extreme conditions achieve curing, which necessitates artificial provision these conditions. Moreover, such may accelerate equipment aging negatively impact matrix material. To issues, this paper reports a photosensitive microcapsule that can by natural light for self‐healing insulating composites. particular, SiO 2 nanoparticles are incorporated into shell construct UV shielding layer, effectively preventing premature failure untriggered microcapsules. Experimental results indicate proposed microcapsule@SiO exhibits excellent thermal stability, remaining intact at temperatures up 200°C. With content approximately 77.5%, ensures repair. Furthermore, when cross‐linked with resin, it has minimal negative on matrix, slight improvement mechanical properties. The composites demonstrate outstanding response scratch damage. Without need any stimuli, be easily activated light, facilitating intelligent, contactless, autonomous self‐healing.

Language: Английский

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Mechanical behavior and self-healing effect of composite plate with pure polyamine and epoxy microcapsules subjected to impact fracture

Composites Science and Technology, Journal Year: 2025, Volume and Issue: unknown, P. 111038 - 111038

Published: Jan. 1, 2025

Language: Английский

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Complex Core–Shell Architectures through Spatially Organized Nano-Assemblies

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

Published: Jan. 17, 2025

Core–shell structures demonstrate superior capability in customizing properties across multiple scales, offering valuable potential catalysis, medicine, and performance materials. Integrating functional nanoparticles a spatially controlled manner is particularly appealing for developing sophisticated architectures that support heterogeneous characteristics tandem reactions. However, creating such complex with site-specific features remains challenging due to the dynamic microenvironment during shell-forming process, which considerably impacts colloidal particle assembly. Here, we describe method deploy nanoscale assemblies within microscale comprising dense shell liquid core through surface decoration coupled emulsion-based synthesis. Exploiting spectrum of grafted incrementally varying densities organic ligands, reveal nanofeatures can be selectively sculpted onto exterior, wall, on interior surface. The versatility this mechanism validated by systematically arranging various compositions, shapes, dimensions. Spatially integrated nanotitania endows core–shell localized photocatalytic abilities. Additionally, distinctive modifications enable simultaneous yet independent implantation diverse nanoparticles, yielding intricate programmable functions. This generalizable approach showcases synthetic strategy attain structural complexity sophistication reminiscent those biological systems nature.

Language: Английский

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The construction of a stable physical–chemical multi-crosslinking structure through a simplified FROMP strategy synergistically enhances the flame retardancy and mechanical properties of PDCPD

Advanced Composites and Hybrid Materials, Journal Year: 2025, Volume and Issue: 8(1)

Published: Feb. 1, 2025

Language: Английский

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Design and Preparation of a High Mechanical Strength Recyclable Polyurethane Adhesive Based on Dynamic Disulfide Bonds

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

Published: March 1, 2025

ABSTRACT To overcome the major limitations of poor mechanical properties traditional polyurethane adhesives and improve their low reuse efficiency, a series thermoplastic adhesives, named 2SPU, were obtained by combining polyester polyols: poly‐1,4‐butanediol adipate (PBA), self‐made soybean oil‐based polyols (MESO), toluene diisocyanate (TDI), incorporating dynamic disulfide bonds to introduce thermal cycling function. Properties analysis shows that when synthesized adhesive contain 5% 2,2′‐dithiodianiline (2‐AFD), it exhibits great strength good self‐healing ability (compared without bonds, its shear increases from 43.38 118.08 MPa initial repair efficiency could increase 24.4% 96.6%). SEM clearly process. These based on SS chain exchange reaction has application potential as dressing for promoting recycling high bonding adhesives.

Language: Английский

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High performance carbon fiber reinforced DCPD composites via frontal polymerization

Journal of Physics Conference Series, Journal Year: 2025, Volume and Issue: 2956(1), P. 012038 - 012038

Published: March 1, 2025

Abstract Carbon fiber reinforced polymer matrix composites (CFRPs) have attracted wide attention due to their light weight and excellent mechanical properties. However, the traditional preparation process is complex, time-consuming large energy input. Here, we developed a method for preparing carbon polydicyclopentadiene (CF/pDCPD) laminate by frontal polymerization (FP). The FP can transform monomer into thermal wave generated self-reaction exothermic reaction, which fast energy-saving method. volume fraction of CF/pDCPD reach level hot-pressed composite material. As content reaches 62.71 ± 0.20 vol%, tensile strength 938.27 41.2 MPa, Young’s modulus 43.54 0.45 GPa, flexural 242.77 4.18 63.84 3.75 GPa. By comparing required hot pressing, consumed only 0.02% pressing. an energy-efficient, environmentally friendly, rapid curing manufacture these materials.

Language: Английский

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Regulation of Lignin Microstructures to Construct Fully Biomass‐Based Elastomers for Large Crack Self‐Healing Artificial Muscles

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

Published: April 15, 2025

Self-healing elastomer-based artificial muscle has attracted growing attention due to their potential applications in various fields. However, the development of self-healing muscles from biomass raw materials, capable repairing large cracks at millimeter scale remains a significant challenge. In this study, novel lignin-based all-biomass elastomer is synthesized via solvent-free, one-pot melting method. Thioctic acid (TA) undergoes ring-opening copolymerization with itaconic (IA) elevated temperatures, forming flexible polymer matrix. Enzymatic hydrolysis lignin (EHL) achieves exceptional dispersion molten TA, followed by situ cross-linking through metal coordination and hydrogen bonding. This resultant nano-enhanced interlocking dual-network structure endows high flexibility, stretchability, self-strengthening capabilities mechanical training, closely mimicking behavior biological muscles. Most importantly, such an demonstrates remarkable shape memory function intrinsic ability, coupled its photothermal properties, which facilitate self-repair millimeter-scale cracks. Thus, study develops strategy for microstructure regulation constructs fully biomass-based muscle, not only addresses challenge but also breakthrough high-value utilization lignin.

Language: Английский

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