Role of Cellulose Nanofiber/Boron Nitride Hybrids in the Thermal Conductivity and Dielectric Strength of Liquid-Crystalline Epoxy Resin

Wang, Haohuan; Tian, Kaiyi; Niu, Jiaxuan; Huang, Zhengyong; Li, Jian; Zhao, Haisen

doi:10.1109/tdei.2020.008954

Cited by 10 publications

(2 citation statements)

References 25 publications

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“…Figure 7(a) shows that the DC breakdown strength of EBN0, EBN5, EBN10, and EBN20 at 30 °C is 100.01, 97.98, 90.65, and 79. 25 Several studies have reported the enhancement of breakdown strength even at lower temperatures and frequencies by introducing insulated h-BN into EP [4,9]. However, some researchers also reported a decrement in the breakdown strength of BN/EP composites [2,26].…”

Section: Breakdown Strengthmentioning

confidence: 99%

“…Therefore, new materials exhibiting enhanced thermal and electrical properties are urgently needed. EP resin is widely used as insulation in the electronic industry, electrical equipment, aerospace, and military applications due to its low cost, easy manufacturing, lightweight, and excellent insulation and chemical properties [3][4][5][6]. However, the low thermal conductivity of EP does not allow its applications for HT and, ultimately, for high EF and HF environments.…”

Section: Introductionmentioning

confidence: 99%

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Investigating optimal region for thermal and electrical properties of epoxy nanocomposites under high frequencies and temperatures

Awais¹,

Chen²,

Dai³

et al. 2022

Nanotechnology

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This research investigates the optimal region to achieve balanced thermal and electrical insulation properties of epoxy (EP) under high frequency (HF) and high temperature (HT) via integration of surface-modified hexagonal boron nitride (h-BN) nanoparticles. The effects of nanoparticle content and high temperature on various electrical (DC, AC, and high frequency) and thermal properties of EP are investigated. It is found that the nano h-BN addition enhances thermal performance and weakens electrical insulation properties. On the other side, under HF and HT stress, the presence of h-BN nanoparticles significantly improves the electrical performance of BN/EP nanocomposites. The EP has superior insulation properties at low temperature and low frequency, whereas the BN/EP nanocomposites exhibit better insulation performance than EP under HF and HT. The factors such as homogeneous nanoparticle dispersion in EP, enhanced thermal conductivity, nanoparticle surface modification, weight percent of nanoparticles, the mismatch between the relative permittivity of EP and nano h-BN, and the presence of voids in nanocomposites play the crucial role. The optimal nanoparticle content and homogenous dispersion can produce suitable EP composites for the high frequency and high temperature environment, particularly solid-state transformer applications.

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Section: Breakdown Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigating optimal region for thermal and electrical properties of epoxy nanocomposites under high frequencies and temperatures

Awais¹,

Chen²,

Dai³

et al. 2022

Nanotechnology

View full text Add to dashboard Cite

show abstract

Influence of dielectric barrier effect and thermally‐conductive network on thermal and electrical properties of epoxy under different frequencies and temperatures

Awais

Chen

Shi

et al. 2022

J of Applied Polymer Sci

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Epoxy resin (EPR) insulations play a vital role in the insulation of modern power electronic equipment owing to their excellent dielectric properties.However, due to the high-power density and miniaturization of power equipment which causes high heat fluxes under high voltage and high-frequency stresses, EPR with good thermal and insulation properties is urgently needed.In this study, the polydopamine functionalized micro-BN and core-shell nano TiO 2 -SiO 2 particles are dispersed in EPR to simultaneously improve thermal and dielectric insulation properties. It is revealed that the addition of micronano particles significantly improves the thermal and dielectric performance. Particularly, the high thermal conductivity of micro-BN and the dielectric barrier effect due to the core-shell structure of nano TiO 2 -SiO 2 are the main reasons for improved thermal and dielectric insulation performance, respectively.The EPR composite containing 3 wt% of micro-BN and 1 wt% of nano TiO 2 -SiO 2 exhibits the optimal performance with 0.49 W/mK thermal conductivity and the highest dielectric strength among all the samples, that is, 60.61 kV/ mm even at 10 kHz and 90 C. This study found that the crucial factors are the surface encapsulation, weight percent, and homogeneous dispersion of particles in EPR, the dielectric barrier effect, thermal conductivity, and the mismatch between the dielectric constant of EPR and particles. This study proposes the optimal weight percent of suitable micro-nano particles for EPR to produce suitable composites for high-frequency and high-temperature applications.

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Advances in Liquid Crystal Epoxy: Molecular Structures, Thermal Conductivity, and Promising Applications in Thermal Management

Zhou,

Wang,

Kong

et al. 2024

Energy & Environ Materials

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Traditional heat conductive epoxy composites often fall short in meeting the escalating heat dissipation demands of large‐power, high‐frequency, and high‐voltage insulating packaging applications, due to the challenge of achieving high thermal conductivity (k), desirable dielectric performance, and robust thermomechanical properties simultaneously. Liquid crystal epoxy (LCE) emerges as a unique epoxy, exhibiting inherently high k achieved through the self‐assembly of mesogenic units into ordered structures. This characteristic enables liquid crystal epoxy to retain all the beneficial physical properties of pristine epoxy, while demonstrating a prominently enhanced k. As such, liquid crystal epoxy materials represent a promising solution for thermal management, with potential to tackle the critical issues and technical bottlenecks impeding the increasing miniaturization of microelectronic devices and electrical equipment. This article provides a comprehensive review on recent advances in liquid crystal epoxy, emphasizing the correlation between liquid crystal epoxy's microscopic arrangement, organized mesoscopic domain, k, and relevant physical properties. The impacts of LC units and curing agents on the development of ordered structure are discussed, alongside the consequent effects on the k, dielectric, thermal, and other properties. External processing factors such as temperature and pressure and their influence on the formation and organization of structured domains are also evaluated. Finally, potential applications that could benefit from the emergence of liquid crystal epoxy are reviewed.

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Role of Cellulose Nanofiber/Boron Nitride Hybrids in the Thermal Conductivity and Dielectric Strength of Liquid-Crystalline Epoxy Resin

Cited by 10 publications

References 25 publications

Investigating optimal region for thermal and electrical properties of epoxy nanocomposites under high frequencies and temperatures

Investigating optimal region for thermal and electrical properties of epoxy nanocomposites under high frequencies and temperatures

Influence of dielectric barrier effect and thermally‐conductive network on thermal and electrical properties of epoxy under different frequencies and temperatures

Advances in Liquid Crystal Epoxy: Molecular Structures, Thermal Conductivity, and Promising Applications in Thermal Management

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