Filler geometry and interface resistance of carbon nanofibres: Key parameters in thermally conductive polymer composites

Gharagozloo-Hubmann, Kati; Boden, André; Czempiel, Gregor; Firkowska, Izabela; Reich, Stéphanie

doi:10.1063/1.4807420

Cited by 23 publications

(23 citation statements)

References 19 publications

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“…Comparing the measured and calculated TC we find that the measured TC of the composite at 65 vol.% fibre concentration is 40% lower in x , y ‐direction and 60–70% lower in z ‐direction than predicted. Assuming the manufacturer data are correct, we suggest two possible factors leading to the lower experimental values: At the ends of the fibres the CTE‐mismatch produces tiny air bubbles, strongly deteriorating the thermal interface . Due to the uniaxial compression, the pores have oblate shape in the x , y plane, creating additional anisotropy in the matrix. …”

Section: Resultsmentioning

confidence: 92%

Thermal properties of metal matrix composites with planar distribution of carbon fibres

Oddone

Reich

2017

Physica Rapid Research Ltrs

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High thermal conductivity (TC) and a tunable coefficient of thermal expansion are essential properties for heat management materials operating in a wide temperature range. We combine both properties in a composite with a low-density metal matrix reinforced with pitch-based carbon fibres. The thermal conductivity of the metal matrix was increased by 50%, the thermal expansion coefficient was reduced by a factor of five. The samples were produced by powder metallurgy and have a planar random distribution of fibres, leading to high performance in two dimensions.Surface of a metal matrix composite with 50% carbon fibre (CF) strengthening (optical microscope, 20Â magnification). RapidResearch Letter 1700090 (4 of 5) V. Oddone and S. Reich: Thermal properties of metal matrix composites ß

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Section: Resultsmentioning

confidence: 92%

Thermal properties of metal matrix composites with planar distribution of carbon fibres

Oddone

Reich

2017

Physica Rapid Research Ltrs

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“…Increasing the amount of fillers to form a network can significantly enhance the thermal conductivity [128][129][130][131][132][133][134][135]. However, a high concentration of fillers could compromise other important properties of a polymer, such as mechanical, electrical, and optical properties.…”

Section: Thermal Conductivity Of Polymer Nanocompositesmentioning

confidence: 99%

Thermal conductivity of polymers and polymer nanocomposites

Huang

Qian

Yang

2018

Materials Science and Engineering: R: Reports

673

391

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Polymers are widely used in industry and in our daily life because of their diverse functionality, light weight, low cost and excellent chemical stability. However, on some applications such as heat exchangers and electronic packaging, the low thermal conductivity of polymers is one of the major technological barriers. Enhancing the thermal conductivity of polymers is important for these applications and has become a very active research topic over the past two decades. In this review article, we aim to: 1). systematically summarize the molecular level understanding on the thermal transport mechanisms in polymers in terms of polymer morphology, chain structure and inter-chain coupling; 2). highlight the rationales in the recent efforts in enhancing the thermal conductivity of nanostructured polymers and polymer nanocomposites. Finally, we outline the main advances, challenges and outlooks for highly thermal-conductive polymer and polymer nanocomposites. the inter-chain coupling. Fig. 1 Schematic diagrams of a polymer: (a) the morphology of a polymer consisting of crystalline and amorphous domains; (b) structure of a polymer chain.In addition to engineering the morphology of polymer chains, another common method to enhance the thermal conductivity of polymers is to blend polymers with highly thermal conductive fillers. The progress of nanotechnology over the last two decades not only provides more diverse high thermal conductivity fillers of different material types and topological shapes but also advances the understanding at the nanoscale. Fig. 2 shows a sketch of a polymer nanocomposite to illustrate the thermal transport mechanisms. In general, there are two types of polymer nanocomposites depending on whether nano-fillers form a network or not. When the filler concentration is low, no inter-filler networks could be formed, as shown in Fig. 2(a). The thermal conductivity is essentially determined by the filler-matrix coupling, i.e, interfacial thermal resistance, and the concentration and the geometric shapes of fillers. When the filler concentration is large enough, high conductivity fillers might form thermally conductive networks, as shown in Fig. 2(b). Although nanocomposites with filler network could possess a higher thermal conductivity than that without a network, their thermal conductivity could still be low due to the large inter-filler thermal contact resistance. Recently, three-dimensional fillers, such as carbon and graphene foams, have drawn a lot of attention. The fundamental thermal transport mechanisms and recent synthesis efforts in both types of nanocomposites are reviewed.This review article is organized as follows. In Section 2, we introduce the experimental progress on the enhancement of thermal conductivity by aligning polymer chains, and then review the methods to further tune the thermal conductivity by engineering chain structure and inter-chain coupling, as illustrated in Fig. 3(a). In Section 3, we discuss the thermal conductivity of polymer nanocomposites both with and without inter...

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“…As widely reported in the literature, thermal conductivity values of polymer composites mostly depend on three parameters: (i) The conductivity of polymer and additives, (ii) interfacial interactions between polymer and additives, iii) the anisotropic thermal properties of fillers 16–24 . As a result, the thermal conductivity of polymer composites is mainly influenced by the loading amount.…”

Section: Resultsmentioning

confidence: 96%

Thermal and electrical properties of aluminum nitride/boron nitride filled polyamide 6 hybrid polymer composites

Yıldız

Akkoyun

2021

J of Applied Polymer Sci

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The effects of boron nitride (BN) and aluminum nitride fillers on polyamide 6 (PA6) hybrid polymer composites were investigated. In particular, the thermal and electrical conductivity, thermal transition, thermal degradation, mechanical and morphological properties and chemical bonds characteristic of the materials with crystal structure of BN and aluminum nitride (AlN) filled PA6 prepared at different concentrations were characterized. Thermal conductivity of hybrid systems revealed a 1.6‐fold gain compared to neat PA6. The highest thermal conductivity value was obtained for the composite containing 50 vol% additives (1.040 W/m K). A slight improvement in electrical conductive properties of composites appears and the highest value was obtained for the 50 vol% filled composite with only an increase by 3%. The microstructure of these composites revealed a homogeneous dispersion of AlN and BN additives in PA6 matrix. For all composites, one visible melting peak around 220°C related to the α‐form crystals of PA6 was detected in correlation with the X‐ray diffraction results. An improved thermal stability was obtained for 10 vol% AlN/BN filled PA6 composite (from 405.41°C to 409.68°C). The tensile strength results of all composites were found to be approximately 22% lower than pure PA6.

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Filler geometry and interface resistance of carbon nanofibres: Key parameters in thermally conductive polymer composites

Cited by 23 publications

References 19 publications

Thermal properties of metal matrix composites with planar distribution of carbon fibres

Thermal properties of metal matrix composites with planar distribution of carbon fibres

Thermal conductivity of polymers and polymer nanocomposites

Thermal and electrical properties of aluminum nitride/boron nitride filled polyamide 6 hybrid polymer composites

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