Influence of magnetic alignment and layered structure of BN&amp;Fe/EP on thermal conducting performance

Xu, Shuai; Liu, Hui; Li, Qiaomei; Mu, Qiwu; Wen, Huang

doi:10.1039/c5tc03791c

Cited by 40 publications

(29 citation statements)

References 31 publications

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“…Phonon propagations are significantly hindered and suppressed because of phonon scattering at the interfacial boundary between the filler and the matrix, thereby leading to low TC. 1,[43][44][45][46][47] For the foamed polymer composites, apparently, due to the biaxial flow of materials during the foaming process, the BNNSs probably either turn their face fixed face orientation, or are aligned along the flow direction of materials, i.e., along the cell…”

Section: Figure S1mentioning

confidence: 99%

“…8,12,[36][37][38][39][40][41][42] Other strategies include electric or magnetic field induced filler alignment, ultra-drawing, frozen-drying, and ultra-sonication, etc. [43][44][45][46][47][48][49] Up to now, extensive investigations on the preparation of heat conductive composites have been carried out on solid polymer matrix. 1,5,[18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] The porous polymers with low densities and reduced weights, although they are promising for applications that are sensitive to weights such as aeronautics and astronautics, have received much less attention due to their extremely low TC as a result of introduced air (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Lightweight Porous Polystyrene with High Thermal Conductivity by Constructing 3D Interconnected Network of Boron Nitride Nanosheets

Zhou

Zhang

Wang

et al. 2020

ACS Appl. Mater. Interfaces

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A composite foam consisting of foamed cross-linking polystyrene (c-PS) and boron nitride nanosheets (BNNSs) was synthesized, which shows a higher thermal conductivity (TC) than the corresponding solid counterparts. The BNNSs fillers are found to be aligned along the cell wall as a result of the biaxial stress field from cell expansion during the formation of 3-dimensional interconnectivity in the foams, resulting in an enhanced TC of 1.28 W/m K, near 2 and 4 times those of its solid counterpart and pure c-PS, respectively. It is found that the foaming-assisted formation of the filler network is an efficient strategy to improve the TC at low filler loadings in the composites. Furthermore, the composite foams exhibit low-density, rather low dielectric constants and dissipation factors at wide frequency and temperature ranges. The present work provides a novel approach to designing and preparing lightweight heat conductive polymers with low filler loadings as low-density heat management materials for potential applications in aeronautics and aerospace components.

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Section: Figure S1mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Lightweight Porous Polystyrene with High Thermal Conductivity by Constructing 3D Interconnected Network of Boron Nitride Nanosheets

Zhou

Zhang

Wang

et al. 2020

ACS Appl. Mater. Interfaces

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“…Epoxy resin (EP) sealing materials are widely used in the field of electronic packaging due to their excellent electrical insulation and mechanical properties. However, the heat-conducting property of EP is very poor, and the intrinsic thermal conductivity is only 0.18 W/mK [1]. With the development of miniaturization of electronic equipment, the phenomenon of heat generation becomes more and more serious, which will greatly shorten the service life of the equipment [2].…”

Section: Introductionmentioning

confidence: 99%

“…Figure2shows the corresponding preparation schematic diagram. Steps (1),(2), and (3) are the preparation principles of GR-NH 2 , Fe 3 O 4 -epoxy, and magnetic GR, respectively.Step(1): the KH550 with NH 2 reacts with the hydroxyl groups of the GR, so that the GR is loaded with NH 2 . Step (2): the Fe 3 O 4 with hydroxyl groups reacts with KH560 with epoxy groups to make Fe 3 O 4 have epoxy groups.…”

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confidence: 99%

Preparation and Thermal Conductivity of Epoxy Resin/Graphene-Fe3O4 Composites

Chen

et al. 2021

Materials

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By modifying the bonding of graphene (GR) and Fe3O4, a stable structure of GR-Fe3O4, namely magnetic GR, was obtained. Under the induction of a magnetic field, it can be orientated in an epoxy resin (EP) matrix, thus preparing EP/GR-Fe3O4 composites. The effects of the content of GR and the degree of orientation on the thermal conductivity of the composites were investigated, and the most suitable Fe3O4 load on GR was obtained. When the mass ratio of GR and Fe3O4 was 2:1, the thermal conductivity could be increased by 54.8% compared with that of pure EP. Meanwhile, EP/GR-Fe3O4 composites had a better thermal stability, dynamic thermomechanical properties, and excellent electrical insulation properties, which can meet the requirements of electronic packaging materials.

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“…The use of magnetic fields during the process of the preparation of polymer composite materials can be also an effective way to orientat the filler [21][22][23]. This situation allows increasing the anisotropy of the composite and therefore preferential directions for the heat transport are created along the aligning direction of the filler aggregate.…”

Section: Introductionmentioning

confidence: 99%

Effect of Particle Sizes of Nickel Powder on Thermal Conductivity of Epoxy Resin-Based Composites under Magnetic Alignment

et al. 2019

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Magnetically oriented three-phase composite systems of epoxy resin, aluminum nitride, and nickel have been prepared, the thermal conductivity of composites filled with nickel powder with different particle sizes and content under different applied magnetic fields was studied. The vibrating scanning magnetometer (VSM) and scanning electron microscopy (SEM) were applied to investigate the dispersion of nickel powder in the composites. The results showed that the anisotropic thermal conductivity of the composites treated by applied magnetic field forming chain structure is obtained. The epoxy resin-based composites filled with 30 vol% aluminum nitride with particle size of 1 μm and 2 vol% nickel powder with particle size of 1 μm and aligned with vertical magnetic field have the highest thermal conductivity (1.474 W/mk), which increases the thermal conductivity of the composites by 737% and 58% compared to the pure epoxy resin (0.2 W/mk) and the composites filled with 30 vol% aluminum nitride (0.933 W/mk). In addition, we simulated the influence of nickel powder particles with different particle sizes and arrangements on the thermal conductivity of the composite material in COMSOL Multiphysics software, and the results were consistent with the experimental results.

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Influence of magnetic alignment and layered structure of BN&Fe/EP on thermal conducting performance

Abstract: BN–Fe–BN structure orientation in a uniform magnetic field and the thermal conductivity of the samples reached 3.59 W m−1 K−1.

Cited by 40 publications

References 31 publications

Lightweight Porous Polystyrene with High Thermal Conductivity by Constructing 3D Interconnected Network of Boron Nitride Nanosheets

Lightweight Porous Polystyrene with High Thermal Conductivity by Constructing 3D Interconnected Network of Boron Nitride Nanosheets

Preparation and Thermal Conductivity of Epoxy Resin/Graphene-Fe3O4 Composites

Effect of Particle Sizes of Nickel Powder on Thermal Conductivity of Epoxy Resin-Based Composites under Magnetic Alignment

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