Texture, transport and mechanical properties of graphite nanoplatelet/silicone composites produced by three roll mill

Raza, Mohsin Ali; Westwood, Aidan; Brown, Andy; Stirling, Chris

doi:10.1016/j.compscitech.2011.12.010

Cited by 59 publications

(57 citation statements)

References 30 publications

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“…Thus the electrical anisotropy increases with decreasing viscosity of the polymer and exceeds 1000 in the case of the low viscosity Hatco 2372 matrix (Fig. 2c); these values are much higher than the anisotropies (~10) reported for bulk GNP-based composites2331.…”

Section: Resultsmentioning

confidence: 77%

“…The clean GNP film cross-sections were prepared by immersing the film in liquid nitrogen and breaking it in a frozen state by applying a shear force31; the resulting images are presented in Fig. 4 and clearly indicate preferential in-plane orientation of the GNPs, thereby providing an obvious rationale for the observed anisotropy of the electrical and thermal conductivities.…”

Section: Resultsmentioning

confidence: 99%

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Anisotropic Thermal and Electrical Properties of Thin Thermal Interface Layers of Graphite Nanoplatelet-Based Composites

Tian

Itkis

Bekyarova

et al. 2013

Sci Rep

153

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Thermal interface materials (TIMs) are crucial components of high density electronics and the high thermal conductivity of graphite makes this material an attractive candidate for such applications. We report an investigation of the in-plane and through-plane electrical and thermal conductivities of thin thermal interface layers of graphite nanoplatelet (GNP) based composites. The in-plane electrical conductivity exceeds its through-plane counterpart by three orders of magnitude, whereas the ratio of the thermal conductivities is about 5. Scanning electron microscopy reveals that the anisotropy in the transport properties is due to the in-plane alignment of the GNPs which occurs during the formation of the thermal interface layer. Because the alignment in the thermal interface layer suppresses the through-plane component of the thermal conductivity, the anisotropy strongly degrades the performance of GNP-based composites in the geometry required for typical thermal management applications and must be taken into account in the development of GNP-based TIMs.

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Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Anisotropic Thermal and Electrical Properties of Thin Thermal Interface Layers of Graphite Nanoplatelet-Based Composites

Tian

Itkis

Bekyarova

et al. 2013

Sci Rep

153

View full text Add to dashboard Cite

show abstract

“…These total filler contents from 14 to 18 wt.% were selected to produce hybrid composites because dispersions with higher loadings could not be easily coated as thin at a strain rate of 0.5 mm min -1 [26,27]. These composites were also tested, with cured matrix, as adhesives according to ASTM standard D5470 on a thermal contact resistance measurement rig to quantify their performance as TIMs.…”

Section: Methodsmentioning

confidence: 99%

“…The composites were produced using a 3-roll mill by dispersing BN and VGCNF in RE according to procedures described in our previous publication [26]. Briefly, a weighed amount of resin, BN and VGCNF was first mixed with mechanical stirrer at 1000 rpm for 5 min.…”

Section: Methodsmentioning

confidence: 99%

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Effect of boron nitride addition on properties of vapour grown carbon nanofiber/rubbery epoxy composites for thermal interface applications

Raza

Westwood

Stirling

et al. 2015

Composites Science and Technology

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This work is focused on developing an epoxy-based hybrid composite using BN and VGCNF, with the main motivation of producing thermally conducting but electrically insulating composite thermal interface materials (TIMs). Various compositions of BN/VGCNF/rubbery epoxy hybrid composites were developed by 3-roll milling. The thermal conductivity of hybrid composites increases with increasing VGCNF content and electrical conductivity decreases with increasing BN content. SEM showed that BN inclusion inhibits VGCNF contacts resulting in more electrically insulating composites. Compression testing showed that BN inclusion produced stiffer composites than those produced with VGCNFs at equivalent loading. The thermal contact resistance of 6 wt.% BN/8 wt.% VGCNF/rubbery epoxy composite was 3.36 × 10 -5 m 2 .K/W at a bond line thickness of 18 m. Thermal contact resistance measurements showed that hybrid composites can offer better interfacial thermal transport at thick bond lines and this improves with increasing VGCNF content due to increased thermal conductivity imparted by VGCNF.

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Thermal Properties of Polymer Nanocomposites

Tjong

2012

Polymer Composites With Carbonaceous Nanofillers

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Texture, transport and mechanical properties of graphite nanoplatelet/silicone composites produced by three roll mill

Cited by 59 publications

References 30 publications

Anisotropic Thermal and Electrical Properties of Thin Thermal Interface Layers of Graphite Nanoplatelet-Based Composites

Anisotropic Thermal and Electrical Properties of Thin Thermal Interface Layers of Graphite Nanoplatelet-Based Composites

Effect of boron nitride addition on properties of vapour grown carbon nanofiber/rubbery epoxy composites for thermal interface applications

Thermal Properties of Polymer Nanocomposites

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