Superior thermal transport and electrically insulating properties of epoxy composites with waxberry-like calcined alumina/poly diallyldimethylammonium chloride/diamond

Composites Science and Technology, Journal Year: 2024, Volume and Issue: 248, P. 110440 - 110440

Published: Jan. 23, 2024

Language: Английский

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High Thermal Conductivity and Radiative Cooling Designed Boron Nitride Nanosheets/Silk Fibroin Films for Personal Thermal Management

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(6), P. 7732 - 7741

Published: Feb. 2, 2024

The implementation of passive cooling strategies is crucial for transitioning from the current high-power- and energy-intensive thermal management practices to more environmentally friendly carbon-neutral alternatives. Among various approaches, developing materials with high conductivity emissivity effective personal wearable devices in both indoor outdoor settings poses significant challenges. In this study, we successfully fabricated a patch by combining biodegradable silk fibroin boron nitride nanosheets. This exhibits consistent heat dissipation capabilities under different ambient conditions. Leveraging its excellent radiative efficiency (Rsolar = 0.89 εLWIR 0.84) (in-plane 27.58 W m–1 K–1 out-plane 1.77 K–1), achieves simulated skin temperature reductions approximately 2.5 8.2 °C conditions, respectively. Furthermore, film demonstrates biosafety can be recycled reused at least three months. innovative BNNS/SF holds great potential advancing field materials.

Language: Английский

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Wide-bandgap silica decorated graphite nanosheet for decoupling control of dielectric properties and thermal conductivity in poly(vinylidene fluoride) nanocomposites

Applied Materials Today, Journal Year: 2025, Volume and Issue: 43, P. 102669 - 102669

Published: March 13, 2025

Language: Английский

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Progress in preparation, processing, and application of high dielectric polypropylene matrix composite materials

Polymer Composites, Journal Year: 2024, Volume and Issue: 45(6), P. 4819 - 4838

Published: Jan. 11, 2024

Abstract Currently, in the era of highly advanced information technology, dielectric materials exhibit extensive potential applications realms energy storage and transmission. Polypropylene stands as one most prevalent plastics, lauded for its exceptional mechanical, thermal, electrical, processing attributes. This article expounds upon intricate essence principles underpinning while pinpointing areas which current necessitate enhancements. It further delves into study's selection polypropylene base material, with a focus on impact individual fillers (ferroelectric ceramics, carbon materials, etc.) mixed filler nanoparticles augmenting properties polypropylene. We also delve pertinent fabrication techniques methodologies, such solution blending method, melt situ polymerization method. In context existing polypropylene‐based composite this introduces two quintessential applications: insulation direct cables metal capacitor films. Finally, it concludes by summarizing obstacles challenges that high‐performance composites confront offers insights avenues future research.

Language: Английский

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Preparation and thermal conductivity of bimodal diamond particles reinforced phenolic resin composites

Polymer Composites, Journal Year: 2024, Volume and Issue: 45(12), P. 10686 - 10699

Published: May 7, 2024

Abstract Thermal conductive polymer composites have broad application prospects in the field of thermal management. However, due to intrinsically low conductivity polymers, even if fillers with high mass fraction are filled, cannot be significantly improved. In this paper, bimodal diamond particles (70 wt.% 150 μm and 22 25 μm) were incorporated into phenolic resin construct continuous heat transfer pathways by close packing, thereby enhancing its conductivity. The results indicated that smaller particle size can effectively bridge gaps between larger ones, forming a for conduction. As result, maximum value 12.45 W/(m·K) achieved, which is 65.5 times, 9.8 times 8.4 higher than pure resin, reinforced composite composite, respectively. Furthermore, dissipation water cooling experiments also confirm superior performance particles. When heating voltage 10 V rate 30 mL/min, upper surface temperature 129.2°C lower resin. This investigation provides new type conductivity, has promising It insights preparing packing Highlights Surface modification filler enhances combination interfacial bonding will enhanced D–OH bond on surface. Bimodal lead formation closely packed structure. special structure form three‐dimensional conduction network. highest TC DD/PR W/(m·K).

Language: Английский

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Multifaceted β-cyclodextrin encapsulated cerium oxide nanoparticles incorporated poly(vinylidene fluoride) nanocomposites towards mechanical energy harvesting and strain modulated optoelectronic sensor

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: unknown, P. 158357 - 158357

Published: Dec. 1, 2024

Language: Английский

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Enhanced Dispersibility Induced by Core‐Shell Cu@Crosslinked Polystyrene and Its Effect on Structure and Dielectric Properties of Polyvinylidene Fluoride Nanocomposites

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

Published: March 3, 2025

ABSTRACT The Cu@crosslinked polystyrene (Cu@cPS) core‐shell nanoparticle was designed, and we found it is an effective way to suppress the formation of conductive networks, prevent oxidation Cu nanoparticle, enhance compatibility with polymer matrix, improve dispersity. Compared outstanding performance Cu@cPS can endow nanocomposite films excellent dielectric properties. When temperature 90°C, 20 vol% Cu@cPS/PVDF film ( ε r = 5998, tan δ 0.49, at 100 Hz) possesses a higher relative constant ) lower loss tangent (tan than Cu/PVDF 445, 1.08, Hz). calculated conductivity activation energy E A proved that core/shell structure effectively restrain charges spreading behavior. This novel inorganic@cPS not only opens new avenue fabricate high‐performance but also great significance for preparation inorganic/polymer nanocomposites

Language: Английский

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Performance of thermally conductive NR composites reinforced with stearic acid‐modified microcrystalline cellulose: A combined experimental and molecular dynamic simulation study

Polymer Composites, Journal Year: 2023, Volume and Issue: 45(3), P. 2841 - 2857

Published: Dec. 9, 2023

Abstract With the increasing environmental requirements for improving products and materials using renewable sustainable resources, cellulose has been seen as one of most attractive promising alternatives to traditional inorganic fillers. We developed a new modification method improve interface compatibility between natural rubber sisal cellulose, mechanical thermal conductivity properties composite. Microcrystalline (MCC) was extracted from then hydrophobic (SA‐MCC) prepared by grafting stearic acid on surface MCC. MCC SA‐MCC were added composite material composed boron nitride. The results showed that tensile composites increased 17.3% 20%, respectively, under addition 1.8 wt% SA‐MCC. Furthermore, interfacial interaction components in studied molecular dynamics simulation. solubility parameters, free volume fraction, binding energy calculated verify effectiveness modification. This work is expected provide theoretical basis design preparation high‐performance materials. Highlights Cellulose microcrystals successfully fiber modified. Through combination nitride modified microcrystals, improved synchronously. A reasonable simulation model established analysis strengthening mechanism microscopic point view. conclusions enhancement are good agreement with experimental properties.

Language: Английский

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Polymeric composites and hybrids for high-voltage insulators

Polymer-Plastics Technology and Materials, Journal Year: 2024, Volume and Issue: 63(7), P. 857 - 871

Published: Feb. 15, 2024

In the past few years, considerable focus has been directed toward employment of appropriate coatings with intention mitigating imperfections brought about by various factors including UV radiation, humidity, and particulate matter within insulation framework. Employing an polymer coating to preserve characteristics insulating materials can prove be effective remedy this domain. Polymer composites have emerged as viable substitutes for ceramic insulation, owing their distinctive such lightweight composition, hydrophobic surface properties, thermal dielectric attributes, well superior resistance vandalism. Typically, comprises two primary components: core, commonly composed like fiber or epoxy, secondary part, which incorporates elastomeric substances ethylene propylene diene monomer (EPDM) Polydimethylsiloxane (PDMS). The use silicone contributes prolonged retention primarily due chemical stability inherent in chains. Silicone-based insulators, characterized low energy resulting surface, more suitable wet conditions. However, these are susceptible degradation from environmental temperature, Ultraviolet (UV) radiation. An challenge composite insulators lies aging process. Various strategies employed enhance involving mixing, composition adjustments, incorporation diverse additives improve specific material characteristics. This discussion outlines influencing insulator efficiency explores methods enhancing performance a on superhydrophobic surfaces.

Language: Английский

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Castor oil‐based polyurethane ternary composites with enhanced thermal conductivity and mechanical properties by using liquid metal as second filler

Polymer Composites, Journal Year: 2024, Volume and Issue: 45(7), P. 6184 - 6197

Published: Feb. 22, 2024

Abstract With the miniaturization, high frequency of electronic devices, and low‐carbon sustainable development, higher requirements are put forward for thermal conductive polyurethane composites in terms comprehensive performance renewable raw materials. Herein, choosing bio‐based (PU) derived from castor oil as matrix, liquid metal (LM) aluminum hydroxide (ATH) hybrid filler, oil‐based PU were developed via high‐speed rotation in‐situ polymerization method. The LM‐ATH filler displayed a synergistic enhancement effect on conductivity due to presence LM‐bridging significantly improved effective contact probability between ATH fillers. 50LM‐ATH/PU reached 1.69 Wm −1 K , which was 9.9 times 1.4 than that pure 50ATH/PU, respectively. Notably, exhibited outstanding mechanical properties including tensile strength up 4.0 MPa adhesion 7.9 MPa, especially elongation at break 120% by 200% compared with 50ATH/PU (40%). Additionally, composite possessed excellent electric insulation, stability, inflaming retarding properties, showing great application potential devices field. Highlights Castor ATH‐LM filer developed. 2:8 promoted composites. Hybrid ATH‐endowed better properties. ATH‐LM/PU insulation.

Language: Английский

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