Synergistic enhancement of thermal conductivity for low dielectric constant boron nitride–polytetrafluoroethylene composites by adding small content of graphene nanosheets

Cai, Xinzhi; Dong, Xuanzuo; Lv, Wanxin; Ji, Chengzhi; Jiang, Zeyi; Zhang, Xinru; Gao, Ting; Yue, Kai

doi:10.1016/j.coco.2019.12.002

Cited by 62 publications

(31 citation statements)

References 39 publications

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“…24 Based on these findings, some researchers indicated that incorporating the fillers with different sizes into the matrix was one of the effective ways to simultaneously take advantage of large and small fillers, because small fillers would fill in the gaps between large fillers, which was conducive to forming thermal conductive networks. [25][26][27][28][29][30][31][32][33][34] For example, Bian et al 25 fabricated epoxy resin composites with dopamine modified micro-BN and KH550 modified nano-Al 2 O 3 , and found that the composite possessed a TC of 1.182 WÁm −1 ÁK −1 , when the contents of BN and Al 2 O 3 reached 22.5 and 7.5 wt%, respectively. Guo et al 27 anchored Ag nanoparticles onto reduced graphene oxide (rGO) and fabricated Ag/rGOpolyamide (PI) composites, and reported that the composite's TC was 2.12 WÁm −1 ÁK −1 (Ag/rGO content:15 wt %), which was higher than that of rGO-PI composites at the same filler's content.…”

Section: Introductionmentioning

confidence: 99%

“…Based on these findings, some researchers indicated that incorporating the fillers with different sizes into the matrix was one of the effective ways to simultaneously take advantage of large and small fillers, because small fillers would fill in the gaps between large fillers, which was conducive to forming thermal conductive networks 25–34 . For example, Bian et al 25 fabricated epoxy resin composites with dopamine modified micro‐BN and KH550 modified nano‐Al 2 O 3 , and found that the composite possessed a TC of 1.182 W·m −1 ·K −1 , when the contents of BN and Al 2 O 3 reached 22.5 and 7.5 wt%, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Matching micro‐ and nano‐boron nitride hybrid fillers for high‐thermal conductive composites

Liu

Yang

Dong

et al. 2021

J of Applied Polymer Sci

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Incorporating hybrid fillers into polymer has been considered as one of the effective ways to obtain composites with high-thermal conductivities (TCs). Herein, we fabricated polytetrafluoroethylene (PTFE) composites by using micro-boron nitride nanosheets (mBNNs) and nano-BNNs (nBNNs) as fillers, and studied the optimum ratios of mBNNs to nBNNs (i.e., mBNNs:nBNNs) for obtaining high-thermal conductive composites at different filler's contents. The results indicated that for the composites with total BNNs contents of 10, 20, and 30 wt%, the optimum mBNNs:nBNNs for obtaining the highest TC were 9:1, 9:1, and 5:5, respectively. The highest TC of the composites with 30 wt% BNNs could reach 1.46 WÁm −1 ÁK −1 , which was 356% higher than that of PTFE. The reasons for optimum mBNNs:nBNNs values were interpreted by observing the composite's microstructures. Moreover, the fabricated composites also exhibited excellent electrical insulation properties. This study has important implications for obtaining high-thermal conductive composites using hybrid fillers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Matching micro‐ and nano‐boron nitride hybrid fillers for high‐thermal conductive composites

Liu

Yang

Dong

et al. 2021

J of Applied Polymer Sci

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“…When the frequency was 10 6 Hz, the dielectric constant of the composite with 40 wt.% content was about 3.99, which was about 1.3 times higher than that of pure ANF (~1.75). This could be attributed to the fact that after the addition of fillers in the polymer, due to the effect of interface polarization, the charge accumulation at the interface formed a micro capacitor, which increased the storage of electric energy and improved the dielectric constant of the composite material [ 30 ]. Moreover, AgNP increased the conductivity difference between BNNS and ANF.…”

Section: Resultsmentioning

confidence: 99%

“…In addition to the issue of preparation of BNNS, the inevitable interfacial thermal resistance between BNNS and the matrix also significantly hinders the improvement of thermal conductivity of the composites [ 24 , 25 , 26 , 27 ]. The interfacial thermal resistance is mainly caused by the poor contact between the fillers and the matrix [ 28 , 29 ], and the synergistic effect of modified fillers or hybrid fillers can effectively reduce the interfacial thermal resistance [ 29 , 30 , 31 , 32 ]. According to the research of Wang et al, an effective heat transfer bridge was formed between silver nanoparticles (AgNP) and BNNS, and the interfacial thermal resistance was partially replaced by the lower contact thermal resistance, thus further improving the thermal conductivity [ 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Robust Thermoconductive Films Made from Aramid Nanofiber and Boron Nitride Nanosheet for Thermal Management Application

et al. 2021

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The development of highly thermally conductive composites with excellent electrical insulation has attracted extensive attention, which is of great significance to solve the increasingly severe heat concentration issue of electronic equipment. Herein, we report a new strategy to prepare boron nitride nanosheets (BNNSs) via an ion-assisted liquid-phase exfoliation method. Then, silver nanoparticle (AgNP) modified BNNS (BNNS@Ag) was obtained by in situ reduction properties. The exfoliation yield of BNNS was approximately 50% via the ion-assisted liquid-phase exfoliation method. Subsequently, aramid nanofiber (ANF)/BNNS@Ag composites were prepared by vacuum filtration. Owing to the “brick-and-mortar” structure formed inside the composite and the adhesion of AgNP, the interfacial thermal resistance was effectively reduced. Therefore, the in-plane thermal conductivity of ANF/BNNS@Ag composites was as high as 11.51 W m−1 K−1, which was 233.27% higher than that of pure ANF (3.45 W m−1 K−1). The addition of BNNS@Ag maintained tensile properties (tensile strength of 129.14 MPa). Moreover, the ANF/BNNS@Ag films also had good dielectric properties and the dielectric constant was below 2.5 (103 Hz). Hence, the ANF/BNNS@Ag composite shows excellent thermal management performance, and the electrical insulation and mechanical properties of the matrix are retained, indicating its potential application prospects in high pressure and high temperature application environments.

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“…Polytetrafluoroethylene (PTFE) is one of the few polymers that can meet these requirements due to its excellent dielectric properties, friction properties and thermal stability. 1,2 However, the extremely low thermal conductivity of PTFE (~0.3 W m À1 K À1 ) limits its further application in heat dissipation, which is caused by the random orientation of molecular chains. 3 Introducing fillers with high thermal conductivity is an effective way to improve the thermal conductivity of PTFE.…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermal conductivity and wear resistance of polytetrafluoroethylene via incorporating hexagonal boron nitride and alumina particles

Chen

Yao

et al. 2021

J of Applied Polymer Sci

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Polytetrafluoroethylene (PTFE) receives wide attention in electronic packaging materials due to its excellent dielectric properties, friction properties and thermal stability. However, its extremely low thermal conductivity limits its further application. In this work, hexagonal boron nitride (h-BN) platelets are added into PTFE matrix to improve the thermal conductivity as the expense of largely deteriorated friction property. To make up the loss of friction property, alumina particles (AO) are also added and the effects of filler ratio between h-BN and alumina on the thermal conductivity and tribological performance of PTFE composites are investigated. It is interesting to find that when the filler ratio of h-BN and alumina is fixed at 2:1, the through-plane and in-plane thermal conductivity of PTFE composite filled with 30 vol% hybrid filler can be increased to 1.544 Wm À1 K À1 and 2.029 Wm À1 K À1 (5.5 and 5.7 times that of PTFE), respectively. Furthermore, the coefficient of friction of PTFE composites only increases by 21.32% and the wear rate decreased by 48.09%, compared with that of PTFE. Our work demonstrates a facile method to achieve much improved thermal conductivity of PTFE while maintaining its excellent dielectric properties and friction properties by using hybrid filler of h-BN and AO.

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Synergistic enhancement of thermal conductivity for low dielectric constant boron nitride–polytetrafluoroethylene composites by adding small content of graphene nanosheets

Cited by 62 publications

References 39 publications

Matching micro‐ and nano‐boron nitride hybrid fillers for high‐thermal conductive composites

Matching micro‐ and nano‐boron nitride hybrid fillers for high‐thermal conductive composites

Ultra-Robust Thermoconductive Films Made from Aramid Nanofiber and Boron Nitride Nanosheet for Thermal Management Application

Enhanced thermal conductivity and wear resistance of polytetrafluoroethylene via incorporating hexagonal boron nitride and alumina particles

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