Effect of aspect ratio on thermal conductivity of high density polyethylene/multi-walled carbon nanotubes nanocomposites

Evgin, Tuba; Koca, Halil Doğacan; Horny, Nicolas; Turgut, Alpaslan; Tavman, İsmail; Chirtoc, M.; Omastová, Mária; Novák, Igor

doi:10.1016/j.compositesa.2015.12.013

Cited by 81 publications

(34 citation statements)

References 39 publications

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“…In order to tune or improve the thermal conductivity of these macromolecules, nano sized inorganic particles have been incorporated into the polymer matrices [7][8][9]. Previous works suggested that the effective thermal conductivity of such composite materials is influenced by the thermal properties of the constituents [7,9,10], the thickness and characterstics of the interfacial layer [2,11,12], the filler's geometry/aspect ratio [13] and filler volume fraction [2][3][4]8,[13][14][15][16]. However, to our knowledge, there is no systematic study to understand the combined effect of particle loading, geometry, dispersion state and temperature on the thermal conductivity of PNC.…”

Section: Introductionmentioning

confidence: 99%

Effect of filler loading, geometry, dispersion and temperature on thermal conductivity of polymer nanocomposites

et al. 2017

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Using a unidirectional heat transfer apparatus, the roles of nanoparticle geometry, loading, dispersion and temperature on the thermal conductivity of polymer nanocomposites are investigated. The polymer nanocomposites (PNC) consist of epoxy matrices filled with silica nanopowder and carbon nanotubes, respectively, as well as poly (2-vinylpyridine) (P2VP) matrices loaded with silica nanoparticles. First, it is shown that thermal conductivity generally increases with nanofiller loading. These results are also reasonably described by the three phase Lewis-Nielsen or Halpin-Tsai analytical models. More importantly, it has been also demonstrated that the thermal conductivity of the polymer nanocmposites greatly depends on the dispersion state of the nanofillers. Furthermore, the effect of temperature on the thermal behavior of PNCs is briefly discussed. These results emphasize the important role of nanoparticles content and dispersion state on the thermal characteristics of polymer nanocomposites, which can be used to design composite materials with tunable thermal behavior.

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Section: Introductionmentioning

confidence: 99%

Effect of filler loading, geometry, dispersion and temperature on thermal conductivity of polymer nanocomposites

et al. 2017

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“…Thermally conductive polymer adhesives are generally not considered to be direct drop‐in replacements for metals; instead, they open up a broad range of new opportunities for “thermal management” applications. Thermally conductive polymer adhesives find its usage in applications such as aerospace, heat exchangers, corrosion‐resistant coatings, electronics protection, circuit boards, light emitting devices because of its inherent high thermal conductivity, low density, easy processing, better anti‐corrosion and mechanical properties …”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of hybrid graphene and boron nitride on the cure kinetics and thermal conductivity of epoxy adhesives

Singh

Panda

Mohanty

et al. 2017

Polymers for Advanced Techs

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In the present study, the synergistic effect of hybrid boron nitride (BN) with graphene on the thermal conductivity of epoxy adhesives has been reported. Graphene was prepared by chemical reduction of graphite oxide (GO) in a mixture of concentrated H2SO4/H3PO4 acid. The particle size distribution of GO was found to be ~10 μm and a low contact angle of 54° with water indicated a hydrophilic surface. The structure of prepared graphene was characterized by Fourier transform infrared (FTIR), X‐ray diffraction (XRD), Raman spectroscopy and atomic force microscopy (AFM). The thermal conductivity of adhesives was measured using guarded hot plate technique. Test results indicated an improvement in the thermal conductivity up to 1.65 W/mK, which was about ninefold increase over pristine epoxy. Mechanical properties of different epoxy formulations were also measured employing lap shear test. The surface characterization of different epoxy adhesive systems was characterized through XRD, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) studies. Fourier transform infrared also served to determine the nature of interactions between filler particles and epoxy resin. Non‐isothermal differential scanning calorimetric (DSC) technique was used to investigate the effects of graphene and BN particles on the cure kinetics and cross‐linking reaction of epoxy cured with amine curing agent. The Kissinger equation, the model‐free isoconversional Flynn–Wall–Ozawa method and the Ozawa model were used to analyze the kinetic parameter. Copyright © 2017 John Wiley & Sons, Ltd.

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“…However, CNT are in nature apt to aggregate, which can be explained by nanosize effect, that is, nanomaterials with at least one dimension sized from 1 to 100 nm, have extremely high surface/volume ratio (and thus surface energy) and tend to form aggregation to reduce surface energy . Strong entanglement associated with commercialized CNTs, resulting from their large aspect ratio (>1000), further inhibits good dispersion of CNTs (e.g., in polymer matrix) . Since surface properties of nanomaterials (including CNTs) affect directly the way they interact with their environment, surface functionalization, modifying the properties of a surface by adding or substituting a chemical moiety (e.g., grafting polymer chains), becomes an essential tool to enhance the interfacial interactions between nanomaterials and polymer matrix and shows great potential in developing high performance polymer nanocomposites …”

Section: Introductionmentioning

confidence: 99%

Efficient and Robust Reactions for Polyethylene Covalently Grafted Carbon Nanotubes

Zhang

Wang

et al. 2016

Macromol. Chem. Phys.

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Surface modification of carbon nanotubes (CNTs) with long polymer chains has attracted great attention since it promises high performance nanomaterials. However, due to the chemical inertness of both polyethylene (PE) and CNT, it still remains a challenge to covalently conjugate CNT with PE in a facile manner. In this report, trimethoxysilane terminated PE (TMS‐PE) and trimethoxysilane modified multiwall carbon nanotube (TMS‐MWNT) is prepared through radical mediated thiol‐ene addition reaction between (3‐mercaptopropyl)trimethoxysilane and vinyl terminated PE or pristine carbon nanotube, respectively. Subsequently, organotin‐catalyzed hydrolytic co‐condensation of TMS‐PE and TMS‐MWNT lead to PE covalently grafted mutliwall CNT (PE‐Si‐MWNT) with high graft ratio (17.5 wt%). Such reactions are robust and efficient and the reaction conditions are mild. In addition, the authors provide the very first evidence that end‐grafted PE chains in PE‐Si‐MWNT, which are clearly observed in TEM images, can render high compatibility and good interfacial interactions between CNT and low density PE (LDPE) matrix and thus promote homogeneous dispersion of CNT into LDPE matrix as shown by scanning electron microscopy (SEM) characterization of brittle fracture surfaces of LDPE/PE‐Si‐MWNT nanocomposites.

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Effect of aspect ratio on thermal conductivity of high density polyethylene/multi-walled carbon nanotubes nanocomposites

Cited by 81 publications

References 39 publications

Effect of filler loading, geometry, dispersion and temperature on thermal conductivity of polymer nanocomposites

Effect of filler loading, geometry, dispersion and temperature on thermal conductivity of polymer nanocomposites

Synergistic effect of hybrid graphene and boron nitride on the cure kinetics and thermal conductivity of epoxy adhesives

Efficient and Robust Reactions for Polyethylene Covalently Grafted Carbon Nanotubes

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