Facile preparation of a polysiloxane-based hybrid composite with highly-oriented boron nitride nanosheets and an unmodified surface

Cho, Hong‐Baek; Nakayama, Tadachika; Tokoi, Yoshinori; Endo, Shin; Tanaka, Satoshi; Suzuki, Tsuneo; Jiang, Weihua; Suematsu, Hisayuki; Niihara, Koichi

doi:10.1016/j.compscitech.2010.05.012

Cited by 62 publications

(33 citation statements)

References 21 publications

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“…1,[3][4][5]13,[20][21][22][23][24] As reported previously, the thermal property of hBN-lled composites is mainly inuenced by the interface and dispersion state of hBN in polymer composites. 1,4,5,[20][21][22][23]25,26 The interface is mainly inuenced by the compatibility between the llers and matrix. Modication by hBN can enhance the affinity of the hBN/polymer interface.…”

Section: Introductionmentioning

confidence: 99%

Hot pressing-induced alignment of hexagonal boron nitride in SEBS elastomer for superior thermally conductive composites

Gong

Zhang

et al. 2018

RSC Adv.

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Styrene-ethylene-butylene-styrene (SEBS) composite films containing well-dispersed and highly aligned hexagonal boron nitride (hBN) platelets were achieved by a ball milling process followed by hot-pressing treatment. An ultrahigh in-plane thermal conductivity of 45 W m À1 K À1 was achievable in the SEBS composite film with 95 wt% hBN. The corresponding out-of-plane thermal conductivity was also as high. The hBN/SEBS composite film was further used to cool a CPU connected to a computer, resulting in a decrease by about 4 C in the stable temperature. Percolation thresholds over 40 wt% and 60 wt% in the hBN/SEBS composites were obtained in the in-plane and out-of-plane directions, respectively. This phenomenon has rarely been reported in polymer composites. Molecular dynamics simulations were also conducted to support this percolation threshold. The linear coefficients of the thermal expansion value of the hBN/SEBS composite with 95 wt% hBN was as low as 16 ppm K À1.This was a significant decrease compared to that of pure SEBS (149 ppm K À1). The proposed strategy provides valuable advice about the heat-transfer mechanism in polymer composites containing oriented two-dimensional materials.

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Section: Introductionmentioning

confidence: 99%

Hot pressing-induced alignment of hexagonal boron nitride in SEBS elastomer for superior thermally conductive composites

Gong

Zhang

et al. 2018

RSC Adv.

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“…Importantly, electrophoresis and controlled orientation of BNNSs was achieved without the need to modify the BN surface with magnetic metal nanoparticles 21) or by chemical functionalization. 22) It is noteworthy that the breakdown of polysiloxane-based composite 250¯m thick occurred using an electric field of less than DC 3.5 kV, which was verified to be overcome by applying electric field with nanopulse intervals, 18) as is the demonstration of the morphological changes of h-BN nanofillers into the linear branched structure and the thicker branched structure using further modified techniques. The generation of the linear bridged structure of BN by polarity change may be explained by coordinated effects of dipolarization, Columbic attraction, electrophoresis, and surface charge influenced by static electricity, as mentioned in related research on the incorporation of micro-diamond fillers into polymer matrices.…”

Section: Techniques For Texture Control Of Hybrid Nanocomposites In Rmentioning

confidence: 99%

“…18) Briefly, a pre-polymer mixture of silicone YE5820(A) and YE5822(B) was prepared by mixing 3.0 g of silicone YE5820(A), 0.3 g of silicone YE5822(B) and 0.372 g of hexagonal BN (h-BN) (10 vol.%) in a high-speed mixer at 1500 rpm for 5 min to produce a homogeneous dispersion. This dispersion was cast onto a glass spacer (15 © 15 mm 2 © 250 m) precoated first with the silicone release agent HD-1101 TH, then with HD-TH (soaking for 4 s in the silicone, then drying for 2 min), which was then located between two ITO coated glass electrodes.…”

Section: Localization Control Of Bn Nanosheets In Polymer-based Nanocmentioning

confidence: 99%

Texture-controlled hybrid materials fabricated using nanosecond technology

Cho

Nakayama

Huynh

et al. 2016

J. Ceram. Soc. Japan

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The controlled assembly of micro-and nano-ceramic fillers in polymer nanocomposites provides robust properties such as wetting, adhesion, thermal conductivity, electrical insulation and optical activity, and enable the extended application of these hybrid materials as thermal interfacing materials in microelectronics and for energy conversion. However, the required properties can only be obtained either by homogeneous mixing or by anisotropic orientation of a large amount (>50 vol.%) of expensive fillers, which is economically inefficient. Here we propose a strategy for tuning the orientation and assembly of ceramic boron nitride nanofillers in a polymer nanocomposite using a small amount (<5 vol.%) of filler to enhance thermal conduction. The texture of the BN fillers is tuned by application of a nanosecond pulse electric field and a superconductor magnetic field (10 T); the three-dimensional structure of the products was analyzed using 3-D X-ray CT scanning. The enhanced anisotropic orientation and thermal properties of the products were assessed as a function of the structural variation of the boron nitride fillers in the polymer.

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“…10). 99 BNNSs in the matrix are reoriented in the electric eld direction. This direction can be controlled to be perpendicular to the lm plane.…”

Section: Electric Eld Alignmentmentioning

confidence: 99%

Polymer composites based on hexagonal boron nitride and their application in thermally conductive composites

et al. 2018

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Hexagonal boron nitride (h-BN) is also referred to as "white graphite". Owing to its two-dimensional planar structure, its thermal conductivity along and perpendicular to a basal plane is anisotropic. However, h-BN exhibits properties that are distinct from those of graphite, such as electric insulation, superior antioxidative ability, and purely white appearance. These qualities render h-BN superior as a filler in composites that require thermal conductivity while exhibiting electric insulation. Since the thermal performance of composites is mainly affected by thermal pathways, this article begins with an overall introduction of the preparation of boron nitride nanosheets, followed by a review of the fabrication of h-BN-filled composites. Lastly, the construction of thermally conductive networks is discussed.

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Facile preparation of a polysiloxane-based hybrid composite with highly-oriented boron nitride nanosheets and an unmodified surface

Cited by 62 publications

References 21 publications

Hot pressing-induced alignment of hexagonal boron nitride in SEBS elastomer for superior thermally conductive composites

Hot pressing-induced alignment of hexagonal boron nitride in SEBS elastomer for superior thermally conductive composites

Texture-controlled hybrid materials fabricated using nanosecond technology

Polymer composites based on hexagonal boron nitride and their application in thermally conductive composites

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