Compression-enhanced thermal conductivity of carbon loaded polymer composites

Ohayon‐Lavi, Avia; Buzaglo, Matat; Ligati, Shani; Peretz-Damari, Sivan; Shachar, G.; Pinsk, Noam; Riskin, Michael; Schatzberg, Yotam; Genish, Isaschar; Regev, Oren

doi:10.1016/j.carbon.2020.03.026

Cited by 60 publications

(48 citation statements)

References 80 publications

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“…The in‐plane thermal conductivity of the samples is expected to be much higher because graphene flakes tend to align in the in‐plane direction during the fabrication process. [ 101 ] The nearly constant high thermal conductivity of the composites over a wide temperature range demonstrates that epoxy with graphene fillers can serve as a multifunctional composite for applications in electronic systems, providing excellent EMI shielding, heat dissipation, mechanical support and adhesion even at elevated temperatures.…”

Section: Resultsmentioning

confidence: 99%

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Multifunctional Graphene Composites for Electromagnetic Shielding and Thermal Management at Elevated Temperatures

Barani

Kargar

Mohammadzadeh

et al. 2020

Adv Elect Materials

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EM radiation. For this reason, the electronic components have to be protected from the intra-and inter-system EM radiations in order to avoid fast degradation and failure. [4-14] It has also been suggested that prolonged exposure to even nonionizing EM waves in the MHz and GHz frequency range may have detrimental effects on humans and other living beings making the EMI shielding important from safety perspectives. [15-19] The dense packing of the electronic components in the state-of-the-art 2D, 2.5D, and 3D integrated systems and generation of high heat fluxes create an environment with high temperatures, which adversely affect the efficiency and stability of the EMI shielding materials. [20,21] The absorption of EM waves results in the temperature rise of the material making the situation even worse. The data on the efficiency of the conventional and recent EM shield materials in most cases are limited to room temperature (RT) operation. [20-23] The latter is despite the fact that many new non-metallic materials, introduced for EMI shielding, suffer from thermal instability, oxidation, or significant reduction in the shielding efficiency at high temperatures. These concerns require development of novel multifunctional materials, which can serve concurrently as an excellent EM shields with the high thermal stability and conductivity at elevated temperatures. The ability of such materials to act as the thermal interface materials (TIMs) which can dissipate heat efficiently becomes a necessity rather than an extra bonus feature. [2,3,20,21,24] TIMs are applied between two solid surfaces in order to fill the microscopic voids at the interface, and enhance the thermal transport from a heat source to a heat sink. [25-27] The base materials for TIMs are amorphous polymers, which have low thermal conductivity, typically in the range from 0.2 to 0.5 Wm −1 K −1. [28] For this reason, the polymers used as base materials for TIMs are filled with highly thermally conductive fillers to enhance their overall thermal conductivity. The lowweight, mechanical stability, resistance to oxidation, flexibility, and ease of manufacturing are other important criteria for TIMs. EMI shielding materials block the incident EM waves by reflection and absorption mechanisms. Both mechanisms

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Section: Resultsmentioning

confidence: 99%

“…[26] The thermal conductivity of ≈ 15 Wm −1 K −1 can now be routinely reached by an addition of graphene fillers to polymer matrices. [99][100][101] The thermal conductivity enhancement factor depends on the quality of the filler, its average lateral dimension, and the composite synthesis procedure.…”

mentioning

confidence: 99%

Multifunctional Graphene Composites for Electromagnetic Shielding and Thermal Management at Elevated Temperatures

Barani

Kargar

Mohammadzadeh

et al. 2020

Adv Elect Materials

View full text Add to dashboard Cite

show abstract

“…Because heat flows from the heat source to the heat sink through thermally conductive (TC) materials, the higher thermal conductivity TC materials have, the more efficiently the heat is dissipated [ 2 ]. In particular, carbon-based materials [ 3 ], such as carbon nanotubes (CNTs), graphene [ 4 , 5 , 6 , 7 , 8 ], and graphite [ 1 , 4 , 9 ], have been studied for thermal management due to their excellent thermal conductivity. However, polymer/carbon filler composites show rather low thermal conductivity because of the thermal resistance at the polymer/filler interfaces.…”

Section: Introductionmentioning

confidence: 99%

Thermally Conductive Film Fabricated Using Perforated Graphite Sheet and UV-Curable Pressure-Sensitive Adhesive

et al. 2021

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Thermally conductive films play a crucial role in expanding the lifetime of electronics by dissipating concentrated heat to heatsinks. In this work, a thermally conductive film (g-TC film) was manufactured using a perforated graphite sheet (p-GS) and a UV-curable pressure-sensitive adhesive (PSA) by lamination. A novel UV-curable PSA was prepared by incorporating a UV-curable abietic acid ester into a PSA composition. The UV-curable PSA became a tack-free film upon UV irradiation; thus, a flexible g-TC film with a 52-μm thickness was obtained. The defects in the g-TC film caused by air bubbles were removed by treating the p-GS with oxygen plasma. As the UV-cured PSA made a joint through the holes in the p-GS, cleavage of the graphite was not observed after 10,000 U-folding test cycles with a folding radius of 1 mm. The calculated in-plane thermal conductivity of the fabricated g-TC film was 179 W∙m−1K−1, which was stable after the U-folding tests.

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“…30 In civil constructions, the composite fillers can replace more expensive materials and enhance certain concrete properties like the thermal conductivity, stiffness and energy absorbance. 31,32 Studies on contribution of elevated temperature on the compressive strength of concrete incorporated with polymer composite have been reported in literatures. [33][34][35] Investigation on the behavior of cement mortars incorporated with nano silica (NS), quartz magnetite, and barite aggregates exposed to elevated temperatures was carried out by Horszczaruk et al, 36 to evaluate the mass loss, flexural and compressive strength.…”

Section: Introductionmentioning

confidence: 99%

Thermal energy storage phase change material cement mortar incorporated with clinical waste composites

et al. 2021

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Clinical wastes generated from hospitals and other health care institutions have increased globally, partly because of COVID-19 pandemic. Appropriate handling and disposal of this wastes is important because of their impact on human and environment. One approach is the use this wastes as composite fillers in phase change material (PCM) added into concrete and mortars used in built sector. This study investigates silicon catheter waste (SCW) and latex glove waste (LGW) as fillers mix with PCM cement mortar and evaluates the thermal performance. To determine a viable inclusion method for the cement mortar varying weight (2.5, 5.0, 7.5, and 10.0)% of PCM mixed with SCW and LGW were used as replacement of the composite aggregates. Characterization of the encapsulate PCM cement mortar and thermal analysis under elevated temperatures, compressive strength test, water absorption, porosity, and density was conducted. The microstructural analysis and thermal behavior of the modified specimens after 28 days was tested under dynamic ambient condition. From the result the quality of the cement mortar reduced from excellent to poor as the loading concentration increased from 0 to 10%. The addition of the PCM SCW and PCM LGW to the cement mortar reduced the compressive strength by 38% and 40%, respectively. The density value reduced by 3.2% and 6.8% under elevated temperature and the water absorption increased by 56% and 39%. The morphology of PCM cement mortar mixed with SCW and LGW showed less void spaces with increased homogenous formation.No thermal decomposition was observed in the PCM cement mortar with the addition of the SCW and LGW at elevated temperatures. The SCW and LGW fillers increased the thermal conductivity of the PCM mortar by 14% and 18%, and prolonged the surface temperature by 5 hours by an average of 5 C and 7 C, respectively. In addition, the SCW and LGW fillers mixed with PCM cement mortar was found to enhance the thermal performance by 65% compared with the typical cement mortar. There are huge potential on their application in building and construction industry.

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Compression-enhanced thermal conductivity of carbon loaded polymer composites

Cited by 60 publications

References 80 publications

Multifunctional Graphene Composites for Electromagnetic Shielding and Thermal Management at Elevated Temperatures

Multifunctional Graphene Composites for Electromagnetic Shielding and Thermal Management at Elevated Temperatures

Thermally Conductive Film Fabricated Using Perforated Graphite Sheet and UV-Curable Pressure-Sensitive Adhesive

Thermal energy storage phase change material cement mortar incorporated with clinical waste composites

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