Vertically Aligned and Interconnected Graphene Networks for High Thermal Conductivity of Epoxy Composites with Ultralow Loading

Lian, Gang; Tuan, Chia-Chi; Li, Liyi; Jiao, Shilong; Wang, Qilong; Moon, Kyoung‐Sik; Cui, Deliang; Wong, Ching‐Ping

doi:10.1021/acs.chemmater.6b01595

Cited by 328 publications

(183 citation statements)

References 46 publications

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“…With advances in nanoelectronics and the emergence of new application areas, such as 3D chip stack architectures and flexible electronics, now more than ever there are both needs and opportunities for novel materials to help address the pressing thermal management challenges . The current materials for dissipating heat in electronic devices are mainly polymer‐based composites, due to their ease of processing, light weight, and low cost . In many cases, the insulating property of thermal management materials is critically important because they play a role of electrical insulators.…”

Section: Introductionmentioning

confidence: 99%

Construction of 3D Skeleton for Polymer Composites Achieving a High Thermal Conductivity

Yao

Sun

Zeng

et al. 2018

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Owing to the growing heat removal issue in modern electronic devices, electrically insulating polymer composites with high thermal conductivity have drawn much attention during the past decade. However, the conventional method to improve through-plane thermal conductivity of these polymer composites usually yields an undesired value (below 3.0 Wm K ). Here, construction of a 3D phonon skeleton is reported composed of stacked boron nitride (BN) platelets reinforced with reduced graphene oxide (rGO) for epoxy composites by the combination of ice-templated and infiltrating methods. At a low filler loading of 13.16 vol%, the resulting 3D BN-rGO/epoxy composites exhibit an ultrahigh through-plane thermal conductivity of 5.05 Wm K as the best thermal-conduction performance reported so far for BN sheet-based composites. Theoretical models qualitatively demonstrate that this enhancement results from the formation of phonon-matching 3D BN-rGO networks, leading to high rates of phonon transport. The strong potential application for thermal management has been demonstrated by the surface temperature variations of the composites with time during heating and cooling.

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Section: Introductionmentioning

confidence: 99%

Construction of 3D Skeleton for Polymer Composites Achieving a High Thermal Conductivity

Yao

Sun

Zeng

et al. 2018

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179

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“…Traditional ways to form thermally conductive network usually require a high loading of filler which would exert bad influence on the overall performance of composites. One approach to address this issue was to use graphene aerogel as a free standing filler framework and heat transfer medium, which has already been proposed by lots of scholars . The graphene aerogel with continuous 3D network was infiltrated by thermally insulating polymer matrix to achieve a highly thermally conductive polymeric based composite.…”

Section: Introductionmentioning

confidence: 99%

“…The value was hardly obtainable using traditional methods of commercially available graphene . Lian et al infiltrated epoxy resin into aerogel which was vertically aligned. Comparing with pure epoxy matrix, the TC value of the composite reached 2.13 W m −1 K −1 at a filler fraction of 0.92 vol%, which was enhanced by 1,231%.…”

Section: Introductionmentioning

confidence: 99%

Boron nitride‐graphene sponge as skeleton filled with epoxy resin for enhancing thermal conductivity and electrical insulation

Guo

Wang

et al. 2019

Polymer Composites

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3D Graphene sponge (GS) supported boron nitride (BN) skeleton (BN@GS) was fabricated through a facile method by using ammonium sulfide under mild conditions. Then, BN@GS sponge was infiltrated by epoxy resin to prepare the composites. The microstructures of BN@GS were controlled by adjusting the mass ratio of GS to BN and the dimension of BN to obtain thermally conductive but electrically insulating polymer composites. The thermal and electrical properties of composites were investigated and the results showed that thermal conductivity of composites reached 0.588 W m−1 K−1 at a low GS loading of 0.157 wt%, which was twice as large as the BN/epoxy composites without graphene. When the mass ratio of BN to GS was 60:1 and 100:1, the electrical conductivity of the resin composites corresponded to insulator region. The 3D continuous network of GS endowed the composites with enhanced thermal conductivity at a relatively low filler loading. In addition, the introduction of BN cut off the transmission of electrons which resulted in the composites with electrical insulation. The hybrid fillers were introduced to guarantee the enhanced thermal conductivity and electrical insulation at a relatively low filler loading. The thermal conductivity of the BN@GS/epoxy composites coincide well with the surface temperature variation of the BN@GS/epoxy composites acquired from an infrared camera. The mechanical properties of BN@GS/epoxy composites improved remarkably in comparison with pure epoxy resin. POLYM. COMPOS., 40:E1600–E1611, 2019. © 2019 Society of Plastics Engineers

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“…[4][5][6][7][8][9][10][11] For instance, it has been reported that NG sheets have a thermal conductivity of 100-2000 W m −1 K −1 in the (002) crystal plane. [13][14][15][16][17] www.advmatinterfaces.de process required sophisticated equipment or special treatment of the fillers. [13][14][15][16][17] www.advmatinterfaces.de process required sophisticated equipment or special treatment of the fillers.…”

Section: Introductionmentioning

confidence: 99%

A Facile Route to Fabricate Highly Anisotropic Thermally Conductive Elastomeric POE/NG Composites for Thermal Management

Feng

Bai

Shao

et al. 2017

Adv Materials Inter

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Owing to the demand for directional heat dissipation, some technologies have been developed to fabricate polymer-based composites with anisotropic thermal conductivity, and it has been demonstrated that the anisotropic thermal conductivity of composites can be achieved by varying orientation of fillers. The orientation or directional alignment of fillers in the matrix by using the solution-based methods is an important strategy [18] such as vacuum filtration, [19][20][21][22] spin casting, [23] solution casting, [24,25] magnetic fields, [26] electric fields, [27] and self-assembly. [28][29][30][31] Zhao et al. [29] used self-organization strategy to align thermally reduced graphene oxide (TRG) sheets in poly(benzobisoxazole). The composites presented a thermally conductive anisotropy with a highly effective thermal conductivity of 50 W m −1 K −1 along the TRG aligning direction and the thermal conductivity in the direction perpendicular to the TRG alignment was very low. Kuang et al. [32] utilized two-roll milling to fabricate hexagonal boron nitride nanosheets (BNNS)/silicon rubber composite sheets with anisotropic thermal conductivity, and the sheets showed higher thermal conductivity of 5.47 W m −1 K −1 in the orientating direction of BNNS.However, in many cases, the preferred direction to show a high thermal conductivity is not the direction in which the composites do have a high thermal conductivity. [33] Although many methods have been developed to fabricate polymer composite fibers, films, or sheets which have high in-plane thermal conductivity in the oriented direction of the fillers, [9,[34][35][36] a high thermal conductivity in the through-plane direction is more desired as the case in thermal interfacial materials (TIMs), thermal conduction greases, and thermal conduction electronic substrates. [37][38][39][40][41] It has been reported that the bulk thermal conductivity required for TIM should be larger than 4 W m −1 K −1 , which can only be satisfied by the thermal conductivity in the in-plane direction. [42] Yao et al. [43] used silver nanoparticles to decorate the fillers and to improve the through-plane thermal conductivity of BNNS/SiC nanowire bioinspired composite paper. However, the through-plane thermal conductivity of the composite paper was only 1.80 W m −1 K −1 when the filler content was as high as 90 wt%. Besides, magnetic field, electric field, and chemical vapor deposition can be used to align fillers in low-viscosity matrix fluids, but generally the alignment Highly anisotropic polyolefin elastomer (POE)/natural graphite (NG) composites with high through-plane thermal conductivity and excellent mechanical properties, in which NG sheet perfectly aligns along one direction, are prepared by two-roll milling, hot compression, and mechanical cutting. The through-plane thermal conductivity coefficient of POE/NG composites is markedly improved to be 13.27 W m −1 K −1 at an NG loading of 49.30 vol%. When the composite is used as a thermal management material, it shows excellent heat dissipatin...

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Vertically Aligned and Interconnected Graphene Networks for High Thermal Conductivity of Epoxy Composites with Ultralow Loading

Cited by 328 publications

References 46 publications

Construction of 3D Skeleton for Polymer Composites Achieving a High Thermal Conductivity

Construction of 3D Skeleton for Polymer Composites Achieving a High Thermal Conductivity

Boron nitride‐graphene sponge as skeleton filled with epoxy resin for enhancing thermal conductivity and electrical insulation

A Facile Route to Fabricate Highly Anisotropic Thermally Conductive Elastomeric POE/NG Composites for Thermal Management

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