Effect of processing technique on the transport and mechanical properties of graphite nanoplatelet/rubbery epoxy composites for thermal interface applications

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

doi:10.1016/j.matchemphys.2011.10.052

Cited by 43 publications

(47 citation statements)

References 29 publications

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“…Prior to measurement of TTCR of paste or composites, the TTCR of the copper block without TIM was also measured for comparison. CBP [14] 29 ± 5 nm --CBU [14] 40 ± 7 nm -- The 25 wt.% GNP-5/RE composite was produced at maximum possible loading of the GNP-5 and the bulk composite had thermal conductivity of 1.12 W/m.K, measured by hot disk thermal constant analyser [15]. The minimum thickness of this composite on smooth substrate achieved without application of additional load was ca.…”

Section: Methodsmentioning

confidence: 96%

“…Silicone elastomer was also used as matrix to produce pastes and adhesives. The details of the fabrication and properties of these composites can be found elsewhere [15,16]. Briefly, appropriate amount of GNPs were mixed in rubbery epoxy resin or glassy epoxy resin by using conventional mechanical mixer with a high speed motor and a propeller attached to a shaft which was rotated at 2500 rpm for 20 min to make composite dispersions.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, one possible explanation for the inferior performance of GE-based adhesive is that voids in the GE coating formed during curing [15] might have reduced its performance as TIM adhesive.…”

Section: Effect Of Matrixmentioning

confidence: 99%

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Comparison of carbon nanofiller-based polymer composite adhesives and pastes for thermal interface applications

2015

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Graphite nanoplatelets (GNP), carbon black (CB) and carbon nanotubes are extensively researched to produce thermal interface materials (TIMs). This work reports comparison of interfacial thermal conductance (ITC) of carbon nanofiller-based polymer composite adhesives and pastes. The results show that total thermal contact resistance (TTCR) of GNP/rubbery epoxy composite was the same as that of an equivalent glassy epoxy composite. Although CB-based rubbery epoxy and silicone composites can be applied as thin bondlines, their TTCRs were significantly higher than GNP/rubbery epoxy. GNPs incorporation into CB/rubbery epoxy composite improves the ITC of the CB/rubbery epoxy composites but the performance of CB/GNP/rubbery epoxy was inferior to GNP/rubbery epoxy. The thermal paste of GNP/polyetheramine had TTCR of 4.8 × 10 -6 m 2 .K/W which is comparable to commercial TIMpaste. The paste produced with silicone had relatively poor ITC versus that prepared with polyetheramine. The paste having smaller particle sized GNPs offers lower TTCR than that prepared with large sized GNPs. The GNP/rubbery epoxy adhesives produced from precursor pastes gave the lowest TTCRs in comparison with the other adhesives. This study suggests that GNPs offer potential for enhancing ITC of TIMs and that ITC of adhesives depends on fillers' thermal conductivity and their interfacial contact with substrates.

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Section: Methodsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

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Comparison of carbon nanofiller-based polymer composite adhesives and pastes for thermal interface applications

2015

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“…Both BN and VGCNF were used as-received. Rubbery epoxy resin (RE) was used as a matrix, details of which can be seen in [24]. Briefly, rubbery epoxy is formed by mixing polyetheramine, a difunctional primary amine with repeating oxypropylene units in the backbone and a molecular weight of about 2000…”

Section: Methodsmentioning

confidence: 99%

“…Jeffamine D2000 is an amine curing agent, however, it should be noted that in rubbery epoxy the Epikote 828 epoxy resin effectively crosslinks the Jeffamine D2000 because Jeffamine D2000 is present in 3× higher quantity than the Epikote 828. The resulting material could therefore be logically termed "crosslinked polyether" but it is commonly known as "rubbery epoxy" because it has a glass transition temperature below normal ambient temperature [25] and significantly lower modulus than highly crosslinked glassy epoxy [24].…”

Section: Methodsmentioning

confidence: 99%

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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Evolving Strategies for Producing Multiscale Graphene‐Enhanced Fiber‐Reinforced Polymer Composites for Smart Structural Applications

et al. 2020

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Graphene has become an important research focus in many current fields of science including composite manufacturing. Developmental work in the field of graphene‐enhanced composites has revealed several functional and structural characteristics that promise great benefits for their use in a broad range of applications. There has been much interest in the production of multiscale high‐performance, lightweight, yet robust, multifunctional graphene‐enhanced fiber‐reinforced polymer (gFRP) composites. Although there are many reports that document performance enhancement in materials through the inclusion of graphene nanomaterials into a matrix, or its integration onto the reinforcing fiber component, only a few graphene‐based products have actually made the transition to the marketplace. The primary focus of this work concerns the structural gFRPs and discussion on the corresponding manufacturing methodologies for the effective incorporation of graphene into these systems. Another important aspect of this work is to present recent results and highlight the excellent functional and structural properties of the resulting gFRP materials with a view to their future applications. Development of clear standards for the assessment of graphene material properties, improvement of existing materials and scalable manufacturing technologies, and specific regulations concerning human health and environmental safety are key factors to accelerate the successful commercialization of gFRPs.

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Effect of processing technique on the transport and mechanical properties of graphite nanoplatelet/rubbery epoxy composites for thermal interface applications

Cited by 43 publications

References 29 publications

Comparison of carbon nanofiller-based polymer composite adhesives and pastes for thermal interface applications

Comparison of carbon nanofiller-based polymer composite adhesives and pastes for thermal interface applications

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

Evolving Strategies for Producing Multiscale Graphene‐Enhanced Fiber‐Reinforced Polymer Composites for Smart Structural Applications

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