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Journal ArticleDOI

A review on modeling of the thermal conductivity of polymeric nanocomposites

01 Dec 2012-E-polymers (De Gruyter)-Vol. 12, Iss: 1
TL;DR: In this paper, the thermal conductivity measurement and modeling of polymeric nanocomposites are discussed in general, and detailed examples are also drawn from the scientific literature, such as liquid cooling and ventilation garment, power electronics, electric motors and generators, heat exchangers, etc.
Abstract: This review reports recent advances in the field of thermal conductivity of polymeric nanocomposites. Thermally conductive polymeric nanocomposites can be used for replacing metal parts in several applications, such as liquid cooling and ventilation garment, power electronics, electric motors and generators, heat exchangers, etc., because the polymers have some privileges such as light weight, corrosion resistance, lower manufacturing cost and ease of processing. In this study, the thermal conductivity measurement and modeling of polymeric nanocomposites are discussed in general, and detailed examples are also drawn from the scientific literature. Many theoretical models are available to predict the thermal conductivity of nanocomposites. The simplest of these are mixture rules such as series, parallel, and geometric models. However, the series model typically over predicts the thermal conductivity, whereas the parallel model tends to under predict the thermal conductivity of the nanocomposites. Other models such as the Hamilton-Crosser model and the Lewis-Nielsen model are based on particle size, geometry, and the manner of particle packing in the matrix. Also, there are various effective medium approaches (EMA) like the Maxwell-Garnett (MG) approximation to analyze the thermal transport behaviour in heterogeneous media such as thermal conductivity of some composite structures.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a literature review on a thermal conductivity of transparent and flexible polymers containing fillers is presented, and three major types of TFPs considered are poly-dimethyl siloxane (PDMS), polyethylene terephthalate (PET), and polyimides (PI).

150 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of graphite nanoplatelets (GNPs) on thermal conductivity of nanoreinforced polymers and nanomodified carbon fiber epoxy composites (CFRPs) was investigated.
Abstract: The present study attempts to investigate the influence of multiwalled carbon nanotubes (MWCNTs) and graphite nanoplatelets (GNPs) on thermal conductivity (TC) of nanoreinforced polymers and nanomodified carbon fiber epoxy composites (CFRPs). Loading levels from 1 to 3% wt. of MWCNTs and from 1 to 15% wt. of GNPs were used. The results indicate that TC of nanofilled epoxy composites increased with the increase of GNP content. Quantitatively, 176% and 48% increase of TC were achieved in nanoreinforced polymers and nanomodified CFRPs, respectively, with the addition of 15% wt. GNPs into the epoxy matrix. Finally, micromechanical models were applied in order to predict analytically the TC of polymers and CFRPs. Lewis-Nielsen model with optimized parameters provides results very close to the experimental ones in the case of polymers. As far as the composites are concerned, the Hashin and Clayton models proved to be sufficiently accurate for the prediction at lower filler contents.

36 citations


Cites background or methods from "A review on modeling of the thermal..."

  • ...” The values of “R k ” that are used for testing the Prasher model are obtained from literature [9, 19]....

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  • ...This allows better processing windows for the incorporation of higher contents (>5%) which is necessary in order to achieve higher increase in thermal conductivity [9]....

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  • ...These factors are the geometry, orientation, volume fraction, and the dispersion of nanofillers into the polymer, as well as the interfacial thermal resistance between the phases [9, 10]....

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Journal ArticleDOI
TL;DR: In this paper, a Continuous Wire Polymer Composite (CWPC) manufacturing method using an open-source desktop 3D printer is presented, where the incorporation of continuous wires within AM structures results in a composite structure.
Abstract: There has been a growing trend towards producing functional components using additive manufacturing (AM). A Continuous Wire Polymer Composite (CWPC) manufacturing method using an open-source desktop 3D printer is presented. The incorporation of continuous wires within AM structures results in a composite structure. The reinforcement of AM components with continuous wires results in improved mechanical properties and wire reinforcement can be oriented in critical locations of AM components. The CWPC manufacturing method will allow for fabrication of thermal and mechanical sensors for temperature and strain, 3D printed heating elements and for high strength components.

24 citations

Journal ArticleDOI
TL;DR: In this paper, the authors studied the electrical and thermal properties of segregated polymer composites based on ultra-high-molecular-weight polyethylene (UHMWPE) filled with carbon fillers (nanofiller graphene (Gr), microfiller anthracite (A) and hybrid filler Gr/A).

23 citations

Journal ArticleDOI
TL;DR: In this article, the authors developed a combined molecular dynamics finite element multiscale modeling to investigate the heat transfer along CNT/epoxy nanocomposites, and the results suggest that the interfacial thermal conductance between the CNT additives and epoxy polymer dominate the heat-transfer mechanism at the nanoscale.
Abstract: Epoxy is among the most important polymers, which is extensively employed in various technologies and applications. Nevertheless, epoxy polymers present low thermal conductivities and thus the enhancement of their thermal conductivity is an important research topic. Carbon nanotubes (CNTs) owing to their excellent thermal conductivities have been widely considered for the enhancement of the thermal conduction of epoxy polymers. In this work, we developed a combined molecular dynamics finite element multiscale modelling to investigate the heat transfer along CNT/epoxy nanocomposites. To this aim, the heat transfer between the CNT and epoxy atoms at the nanoscale was explored using the atomistic classical molecular dynamics simulations. In this case, we particularly evaluated the interfacial thermal conductance between the polymer and fillers. We finally constructed the continuum models of polymer nanocomposites representative volume elements using the finite element method in order to evaluate the effective thermal conductivity. The developed multiscale modelling enabled us to systematically analyze the effects of CNT fillers geometry (aspect ratio), diameter and volume fraction on the effective thermal conductivity of nanocomposites. Our results suggest that the interfacial thermal conductance between the CNT additives and epoxy polymer dominate the heat transfer mechanism at the nanoscale. The obtained findings in this study provide good vision regarding the enhancement of thermal conductivity of polymeric materials using highly conductive nanofillers.

21 citations

References
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Book
01 Jan 1978
TL;DR: This encyclopedic work includes authoritative coverage of atomic and molecular structure, organic chemistry (revised), inorganic, analytical, and electro- chemistry, mathematics as applied to chemistry, and more.
Abstract: Lange's Handbook has served as a leading source of reliable chemical information and data for chemists, engineers, and other technical specialists since l934. This encyclopedic work includes authoritative coverage of atomic and molecular structure, organic chemistry (revised), inorganic, analytical, and electro- chemistry, mathematics as applied to chemistry, and more. It also includes nomenclature consistent with recommendations of the IUPAC Commission rules.

7,848 citations

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Thermally conductive polymeric nanocomposites can be used for replacing metal parts in several applications, such as liquid cooling and ventilation garment, power electronics, electric motors and generators, heat exchangers, etc., because the polymers have some privileges such as light weight, corrosion resistance, lower manufacturing cost and ease of processing.