Perfluoroalkylsilane-Modified Boron Nitride Nanosheets for Epoxy Composites with Improved Thermal Conductivity and Dielectric Performance

Huang, Zhipei; Yang, Ruirui; Zheng, Xiangdan; Zhang, Ling; Liu, Wanshuang

doi:10.1021/acsapm.2c01702

Cited by 12 publications

(5 citation statements)

References 48 publications

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“…Figure 4D summarizes the thermal conductivity of polymer composites with BN as a thermally conductive filler reported in recent years and compares it with this paper. [37][38][39][40][41][42][43][44][45] The thermal conductivity of the sample prepared in this paper is significantly better than that reported in other papers under the condition of the same filler load. For composites obtained by physical blending, BN particles are randomly dispersed within the resin matrix, which leads to severe phonon scattering at the "organicinorganic" interface.…”

Section: Thermal Conductivity Of Compositescontrasting

confidence: 54%

“…This structure with dual heat transfer channels enables efficient heat transmission. Figure 4D summarizes the thermal conductivity of polymer composites with BN as a thermally conductive filler reported in recent years and compares it with this paper 37–45 . The thermal conductivity of the sample prepared in this paper is significantly better than that reported in other papers under the condition of the same filler load.…”

Section: Resultsmentioning

confidence: 54%

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Highly thermally conductive polymer composite enhanced by constructing a dual thermal conductivity network

Wang

Zhang

et al. 2023

Polymer Composites

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Constructing interconnected thermally conductive networks in a polymer matrix is essential for efficient heat transport in thermally managed materials. Thermally conductive network structures typically have meager thermal resistance, and heat transfer into the material is rapidly exported along such networks. However, increasing the thermally conductive networks inside the polymer matrix is still challenging. This paper prepared high thermal conductivity composites with “primary‐secondary” thermal conductivity networks by combining two processes: constructing three‐dimensional thermally conductive skeletal networks and physically blending fillers, using epoxy resin as the matrix. The performance test results showed that the thermal conductivity of the composites reached 1.65 W/(m K) when the boron nitride (BN) content reached 33.5 wt%, which was 842.8% and 150% higher than that of pure epoxy (EP) and composites with randomly dispersed fillers. This highly efficient heat transfer behavior is mainly due to the synergistic effect of the two‐level thermally conductive network, which weakens the scattering effect of phonons to a great extent. Also, the dielectric properties of the composite material, especially the transport of carriers inside the material under strong electric fields, were discussed in this paper. This work provides ideas and methods for preparing electrical and electronic devices applied to high power density.

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Section: Thermal Conductivity Of Compositescontrasting

confidence: 54%

Section: Resultsmentioning

confidence: 54%

Highly thermally conductive polymer composite enhanced by constructing a dual thermal conductivity network

Wang

Zhang

et al. 2023

Polymer Composites

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“…All these temperatures are above 200°C, indicating that SRVs exhibit high heat resistance. The heat resistance index ( T HRI ) [ 46 ] of the SRVs are determined to be 138.6, 148.6, 139.8, and 138.2 °C, respectively, demonstrating a trend of initially increasing and then decreasing. When R is 0.8, the SRV shows the highest T HRI of 148.6 °C.…”

Section: Resultsmentioning

confidence: 99%

Fast Degradable and Thermally Conductive Silicone Rubber Vitrimer with Low Dielectric and UV‐Shielding Properties

Zhang,

Dang,

Zhang

2023

Macro Chemistry & Physics

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Silicone rubbers have been widely employed in various fields such as electronics, electrical engineering, mobile communications, aerospace, and automotive industries. However, silicone rubbers are typically challenging to reprocess and degrade. Moreover, with the advancement of technology, higher demands have been placed on its thermal conductivity and dielectric properties. In this study, diglycidyl ether terminated polydimethylsiloxane was cured by 4,4′‐dithiodibutyric acid which contains dual dynamic covalent disulfide and ester bonds with triazobicyclodecene as the ester exchange catalyst to prepare silicone rubber vitrimers (SRVs) through a casting method. The SRVs demonstrated a relatively higher intrinsic thermal conductivity of 0.26 W/(m·K) compared to ∼0.20 W/(m·K) of conventional silicone rubber. Besides, the SRVs exhibited very low and stable dielectric constant and dielectric loss at both low and high frequencies (X‐band). The lowest dielectric constant and dielectric loss tangent at 10 GHz were 2.75 and 0.0639, respectively. Besides, the dual dynamic covalent bonds enabled the SRVs to have excellent reprocessability and fast degradability. Moreover, the SRVs revealed UV‐shielding capability, as the transmittance of the SRVs was 0% from 200 to 400 nm of UV light.This article is protected by copyright. All rights reserved

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“…So, the single h-BN-filled geometric model seems inappropriate for studying the synergistic impact on the overall thermal conductivity . Additionally, some studies have indicated that the effective thermal conductivity of composites closely correlates to the properties of interface because the generated interface thermal resistance affects heat transfer, − but the interface components are usually absent for many built finite element models. − Therefore, the randomly generated geometric model needs to be further developed, and a comprehensive analysis of the role of the variable is highly desired.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on the Optimization of the Anisotropic Thermal Conductivity of Hexagonal Boron Nitride/Nanofiber Composite Films

Liu

Jia

et al. 2023

Ind. Eng. Chem. Res.

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Understanding the relationship between the physical properties of composite components and thermal conductivity is conducive to optimize the overall heat-dissipation performance. Herein, we conduct a numerical simulation to investigate the anisotropic thermal conductivity and heat flux distributions of hexagonal boron nitride (h-BN)/nanofiber composite films. The critical issues to be considered include the effect of the intrinsic thermal conductivity of the nanofiber matrix and h-BN filler, the geometric size and orientation of the h-BN filler, and the interface thermal resistance. The results demonstrate that increasing the intrinsic thermal conductivity of nanofiber matrix is beneficial to bridge the straightforward h-BN pathway along the directional heat transfer, and the thermal barrier can be effectively inhibited by tuning the interface thermal resistance below 10 −8 m 2 •K•W −1 . As for the h-BN fillers, increasing their intrinsic thermal conductivity and length have very limited contributions to the improvement of anisotropic thermal conductivity. But raising the aspect ratio of h-BN and regulating the orientation of the well-stacked layered h-BN filler toward the heat source transfer direction are conducive to enhance the directional thermal conductivity. Based on these comprehensive mathematical analyses of all of the influencing factors, we propose an optimized equation for effectively predicting the anisotropic thermal conductivity of h-BN/nanofiber composite films. The findings are expected to guide the design of highly anisotropic thermal conductive materials.

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Perfluoroalkylsilane-Modified Boron Nitride Nanosheets for Epoxy Composites with Improved Thermal Conductivity and Dielectric Performance

Cited by 12 publications

References 48 publications

Highly thermally conductive polymer composite enhanced by constructing a dual thermal conductivity network

Highly thermally conductive polymer composite enhanced by constructing a dual thermal conductivity network

Fast Degradable and Thermally Conductive Silicone Rubber Vitrimer with Low Dielectric and UV‐Shielding Properties

Numerical Simulation on the Optimization of the Anisotropic Thermal Conductivity of Hexagonal Boron Nitride/Nanofiber Composite Films

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