A controllable and fast carbonization strategy under air conditions and its application in electromagnetic interference (EMI) shielding

Composites Part A Applied Science and Manufacturing, Journal Year: 2025, Volume and Issue: 192, P. 108764 - 108764

Published: Feb. 3, 2025

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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Flexible protective cotton fabrics based on multi-layer nano coating: Sustaining electromagnetic interference shielding capabilities in fire conditions

Progress in Organic Coatings, Journal Year: 2025, Volume and Issue: 201, P. 109131 - 109131

Published: Feb. 16, 2025

Language: Английский

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Unveiling the Potential of Plant-Derived Diarylheptanoids and Their Derivatives in Bio-Based Polyurethane Compositions

Plants, Journal Year: 2025, Volume and Issue: 14(5), P. 775 - 775

Published: March 3, 2025

The key challenge in polymer science is developing sustainable synthesis methods using renewable feedstocks. This study explores plant-derived diarylheptanoids with various structures as the building blocks for polyurethane (PU) materials. Diarylheptanoid glucosides isolated from black alder (Alnus glutinosa) bark were hydrolyzed and fractionated to remove sugar moieties. resulting diarylheptanoids, along unhydrolyzed analogues curcumin, used biomass-based polyols synthesize model PU films. Incorporating enhanced mechanical strength reduced flexibility of due increased crosslinking, effects proportional OH functionality polyols. Weight loss, FTIR, Py-GC-MS/FID analyses revealed that catechol moieties glucosidic bonds are biodegradable structural subunits incorporated into Rigid foams (PURs) incorporating high-OH-functionality diarylheptanoid such oregonin demonstrated significantly higher compression less weight loss during non-isothermal thermal analysis air compared those commercial polyol-based foams. A cone calorimeter test showed PUR foam derivatives had a lower degradation rate, longer flame-burning time, 30% heat emission, 25% smoke, indicating improved flame retardancy. Adding 1–2% oregonin-enriched extracts Elastopir 1132/509/0 its resistance oxidative aging, outperforming antioxidant Irganox.

Language: Английский

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Facile construction of bio-based organic–inorganic integrated magnesium hydroxide rod-crystal: The formation of a dual barrier to enhance fire safety and smoke suppression of epoxy resin

Composites Part A Applied Science and Manufacturing, Journal Year: 2025, Volume and Issue: unknown, P. 108853 - 108853

Published: March 1, 2025

Language: Английский

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Recycling Waste Metallized Biaxially Oriented Plastic Films as Filler in Polyurethane Foams: Properties and Environmental Impact

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

Published: March 10, 2025

ABSTRACT The surge in popularity of multi‐layered plastics recent years can be attributed to their superior characteristics, which include better barrier performance and long‐term dependability for a variety commodity packaging solutions. However, because intricate design rising consumption, are harmful the environment. There currently no suitable efficient methodologies managing waste. This study aims reuse waste biaxially oriented plastic (BOP) as filler polyurethane foams evaluate physical, chemical, morphological, thermal, mechanical properties resultant material. In addition, carbon footprint analysis was also performed. produced showed densities well within commercial range. with fillers were found stable up 3 wt% BOP loading. metallized have interactions foam chemically, confirmed by Fourier transform infrared spectroscopy results. Thermal conductivity compressive strength samples increase Finally, adopting this strategy, that is, incorporating just half mattresses sold globally reduce annual global 882,000 tons.

Language: Английский

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Fabrication of Fluorine and Nitrogen-Based Flame Retardants Containing Rigid Polyurethane Foam with Improved Hydrophobicity and Flame Retardancy

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

Published: April 22, 2025

Language: Английский

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Preparation and properties of alginate based flame-retardant epoxy resin materials

Journal of Fire Sciences, Journal Year: 2025, Volume and Issue: unknown

Published: April 30, 2025

Copper alginate (CA) and manganese (MA) were prepared from the polysaccharide biomass sodium alginate, these two alginates introduced to epoxy resin (EP) improve flame retardancy. The limiting oxygen index (LOI), vertical combustion (UL-94), cone calorimetry (CCT), thermogravimetric analysis (TGA) have been employed analyze impacts of on retardancy, thermal stability, char formation characteristics EP. Compared pure EP, when 20 wt% CA or MA was added, LOI increased by 5.6% 6.7%, respectively, no melt drops appeared. Because having catalytic carbonization effects, residual EP composites containing significantly, 5.53% 9.56%, respectively. peak heat release rate (PHRR) total (THR) composite drastically reduced. PHRR is reduced 38.9% 33%, while THR decreased 27% 31%, In addition, smoke production approximately 17% 30%, scanning electron microscope (SEM) tests revealed that had a stronger charcoal-forming ability, their charcoal layers more homogeneous compact microstructures. Briefly, CA, can effectively promote matrix in condensed phase, flame-retardant properties are improved.

Language: Английский

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Improved thermal stability, flame retardancy and mechanical properties of casein-based rigid polyurethane foam modified with organic sepiolite

Construction and Building Materials, Journal Year: 2025, Volume and Issue: 479, P. 141517 - 141517

Published: April 29, 2025

Language: Английский

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