Preparation and properties of boron nitride/epoxy composites with high thermal conductivity and electrical insulation

Weng, Ling; Wang, HeBing; Zhang, Xiaorui; Zhang, Hexin

doi:10.1007/s10854-018-9560-8

Cited by 26 publications

(17 citation statements)

References 16 publications

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“…Furthermore, nanoparticles construct huge interfacial zone and tend to introduce more traps [6][7][8]. Once the inter-filler distances are small enough, the volume of the polymer matrix is reduced and the nanoparticles act like barriers to the movements of electrons between the electrodes [23,24].…”

Section: Effects Of Micro/nano-bn Co-doping On Breakdown Performance Of Epoxy Compositesmentioning

confidence: 99%

“…Furthermore, nanoparticles construct huge interfacial zone and tend to introduce more traps [6][7][8]. Once the interfiller distances are small enough, the volume of the polymer matrix is reduced and the nanoparticles act like barriers to the movements of electrons between the electrodes [23,24]. Additionally, considering the fact that the epoxy composites operate under a highfrequency high-voltage bipolar square wave, voltage endurance time under high frequency bipolar square wave voltage is used to evaluate the dielectric strength of the composites (fixed at 25 kHz and 8 kV), as well.…”

Section: Effects Of Micro/nano-bn Co-doping On Breakdown Performance Of Epoxy Compositesmentioning

confidence: 99%

“…Although the addition of micro fillers is beneficial to improving thermal conductivity, it inevitably increases the viscosity of the uncured mixtures and decreases breakdown strength. Reversely, despite the excellent breakdown strength of nanocomposites, their thermal conductivities are lower because of forming a large amount of interfacial area [23,24]. This raises the issue of whether the thermal conductivity and breakdown performance could be simultaneously enhanced by co-doping micro and nanofillers into the epoxy matrix.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneously Enhanced Thermal Conductivity and Breakdown Performance of Micro/Nano-BN Co-Doped Epoxy Composites

et al. 2021

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Micro/nano- BN co-doped epoxy composites were prepared and their thermal conductivity, breakdown strength at power frequency and voltage endurance time under high frequency bipolar square wave voltage were investigated. The thermal conductivity and breakdown performance were enhanced simultaneously in the composite with a loading concentration of 20 wt% BN at a micro/nano proportion of 95/5. The breakdown strength of 132 kV/mm at power frequency, the thermal conductivity of 0.81 W∙m−1∙K−1 and voltage endurance time of 166 s were obtained in the composites, which were approximately 28%, 286% and 349% higher than that of pristine epoxy resin. It is proposed that thermal conductive pathways are mainly constructed by micro-BN, leading to improved thermal conductivity and voltage endurance time. A model was introduced to illustrate the enhancement of the breakdown strength. The epoxy composites with high thermal conductivity and excellent breakdown performance could be feasible for insulating materials in high-frequency devices.

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Section: Effects Of Micro/nano-bn Co-doping On Breakdown Performance Of Epoxy Compositesmentioning

confidence: 99%

Section: Effects Of Micro/nano-bn Co-doping On Breakdown Performance Of Epoxy Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simultaneously Enhanced Thermal Conductivity and Breakdown Performance of Micro/Nano-BN Co-Doped Epoxy Composites

et al. 2021

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“…On moving to h-BN@APTES spectrum, shift in B−N peaks towards lower wavelength is observed. Also, emergence of bands at 1040 and 1120 cm -1 corresponds to the characteristic absorption of Si−O symmetric and asymmetric mode of vibrations authenticates the existence of APTES moiety on the BN nanosheets surface through silylation process 53,54 . Moreover, absorption bands at 2936 and 1633 cm -1 are attributed to the CH 2 and NH 2 stretching vibrations of amino-propyl moiety.…”

Section: Catalyst Characterizationsmentioning

confidence: 72%

Enhanced Catalysis through Structurally Modified Hybrid 2-D Boron Nitride Nanosheets Comprising of Complexed 2-hydroxy-4- methoxybenzophenone Motif

Dixit

Sharma

Dutta

et al. 2021

Preprint

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Tuning the scturtrual architecture of the pristine two dimensional hexagonal boron nitride (h-BN) nanosheets through rational surface engineering can prove advantageous in the fabrication of competent catalytic materials. Inspired by the performance of h-BN based nanomaterials in expediting key organic transformations, we channelized our research efforts towards engineering the inherent surface properties of the exclusively stacked h-BN through the incorporation of a novel competent copper complex of a bidentate chelating ligand 2-hydroxy-4-methoxybenzophenone. Delightfully, this hybrid nanomaterial worked exceptionally well in boosting the [3+2] cycloaddition reaction of azide and nitriles, providing a facile access to a diverse variety of highly bioactive tetrazole motifs. A deep insight into the morphology of the covalently crafted h-BN signified the structural integrity of the exfoliated h-BN@OH nanosheets that exhibited lamellar like structures possessing smooth edges and flat surface. This interesting morphology could also be envisioned to augment the catalysis by allowing the desired surface area for the reactants and thus tailoring their activity. The work paves the way towards rational design of h-BN based nanomaterials and adjusting their catalytic potential by the use of suitable complexes for promoting sustainable catalysis, especially in view of the fact that till date only a very few h-BN nanosheets based catalysts have been devised.

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“…A feasible way to address the thermal issue of devices is to improve thermal conductivity of polymers by adding high thermal conductivity inorganic fillers . Thermally conductive ceramic fillers such as AlN, Al 2 O 3 , SiC, Si 3 N 4 , and BN powders are added to the polymer matrices to modify their thermal conductivity . Boron nitride (BN) has caught great interest because of its high thermal conductivity, superior chemical stability, electrical insulation properties, a large band gap, lack of toxicity, light weight, medium price, and outstanding high temperature resistance …”

Section: Introductionmentioning

confidence: 99%

Synergetic effect of thermal conductivity and flame retardancy of cyanate ester composites containing DOPO and BN with great dielectric properties

Yao

Wang

Chen

et al. 2019

Polymers for Advanced Techs

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DOPO and boron nitride (BN) fillers with different particle sizes and several loadings were employed to improve the properties of cyanate ester (CE) resin. The effects of BN content and particle size on the thermal conductivity of the BN‐DOPO/CE ternary composites were discussed. The influence of enhancing the thermal conductivity of the ternary composites on their flame retardancy was studied. The consequences showed that increasing the thermal conductivity of BN‐DOPO/CE composites had an active impact on their flame retardancy. Approving flame retardancy of the ternary composites was certified by the high limiting oxygen index (LOI), UL‐94 rating of V‐0, and low heat release rate (HRR) and total heat release (THR). For instance, in contrast with pure CE matrix, peak of HRR (pk‐HRR), average of HRR (av‐HRR), THR, and average of effective heat of combustion (av‐EHC) of CEP/BN0.5 μm/10 composite were decreased by 51.7%, 33.8%, 18.7%, and 18.9%, respectively. Thermal gravimetry analysis (TGA) showed that the addition of BN fillers improves the thermal stability of the composites. Moreover, the ternary composites possess good dielectric properties. Their dielectric constants (ε) are less than 3, and dielectric loss tangent (tgδ) values are lower than neat CE resin.

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Preparation and properties of boron nitride/epoxy composites with high thermal conductivity and electrical insulation

Cited by 26 publications

References 16 publications

Simultaneously Enhanced Thermal Conductivity and Breakdown Performance of Micro/Nano-BN Co-Doped Epoxy Composites

Simultaneously Enhanced Thermal Conductivity and Breakdown Performance of Micro/Nano-BN Co-Doped Epoxy Composites

Enhanced Catalysis through Structurally Modified Hybrid 2-D Boron Nitride Nanosheets Comprising of Complexed 2-hydroxy-4- methoxybenzophenone Motif

Synergetic effect of thermal conductivity and flame retardancy of cyanate ester composites containing DOPO and BN with great dielectric properties

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