Polymer compounds with high thermal conductivity

Grundler, Marco; Derieth, T.; Heinzel, Angelika

doi:10.1063/1.4965485

Cited by 16 publications

(13 citation statements)

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“…The thermal conductivity of this material ranged from 5 to 20 W/m·K, according to the provided data sheet. The importance of the filler orientation in a cross section of a thin plate, such as a heat sink fin, was studied in [ 15 ]. However, this article deals with the overall orientation inside the fins, depending on the melt flow during production.…”

Section: Methodsmentioning

confidence: 99%

Importance of Melt Flow Direction during Injection Molding on Polymer Heat Sinks’ Cooling Efficiency

et al. 2021

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Polymers with highly conductive fillers could possibly replace standardly used materials, such as aluminum and copper alloys, for passive cooling purposes. The main problem of the composite polymer-based heat sinks is that their high thermal conductivity is uneven. The orientation of this anisotropy is set according to the position of the highly thermally conductive filler. Its orientation is influenced by the melt flow during the polymer heat sink molding process. This article shows that change of the melt flow inside the mold cavity can improve the overall cooling efficiency of a polymer heat sink, which leads to lower temperatures on the heat source used. Two polymer heat sinks of identical geometries were produced. Their high thermal conductivity was given by the use of graphite flakes as the filler. The only difference between the heat sinks was in the position of the fan gate during their production. Different temperatures of the heat source between the two heat sinks were observed for the same measurement conditions. The measurements were conducted at Heatlab, BUT/Brno.

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Section: Methodsmentioning

confidence: 99%

Importance of Melt Flow Direction during Injection Molding on Polymer Heat Sinks’ Cooling Efficiency

et al. 2021

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“…To increase the thermal conductivity of plastics, thermally conductive fillers can be compounded into the plastic. In this way, thermal conductivities of about 1-20 Wm À 1 K À 1 can be achieved [16][17][18]. The fillers used to increase the thermal conductivity can basically be divided into metallic (aluminium, magnesium oxide, copper and beryllium oxide), organic (carbon nanotubes and graphite) and ceramic fillers (e. g. boron nitride) [16][17][18][19].…”

Section: Thermally Conductive Plasticsmentioning

confidence: 99%

“…In this way, thermal conductivities of about 1-20 Wm À 1 K À 1 can be achieved [16][17][18]. The fillers used to increase the thermal conductivity can basically be divided into metallic (aluminium, magnesium oxide, copper and beryllium oxide), organic (carbon nanotubes and graphite) and ceramic fillers (e. g. boron nitride) [16][17][18][19]. In addition, the type of filler as well as the degree of filler can be varied in order to adapt the thermal conductivity of plastics to the corresponding application [17,18].…”

Section: Thermally Conductive Plasticsmentioning

confidence: 99%

Contacting of inserts with the integrated metal/plastic injection moulding

Sturm,

Koyuncu,

Hopmann

et al. 2023

Materialwissenschaft Werkst

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The integrated metal/plastic injection moulding enables the production of plastics components with integrated conductor tracks and contacted inserts using an injection moulding machine. For this purpose, first a plastics carrier, which contains a groove for the later conductor track, is injection moulded and following electrical inserts are placed along the groove. The conductor track is then die‐casted from metallic solder. By using thermally conductive plastics, heat generated along the conductive paths and at the electrical inserts can be dissipated. A mechanical, electrical and optical characterisation of the material composite consisting of plastics carrier, metallic conductor track and electrical insert is carried out. In addition, process and material parameters that have an influence on the contacting of electrical inserts in connection with thermally conductive plastics in the integrated metal/plastic injection moulding are analysed. The results show that through the use of thermally conductive plastics, significant advantages in terms of heat dissipation and contact quality between the insert and the conductor track can be achieved.

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“…21,22 Therefore, CPs can stimulate the heat conduction as well. 23,24 Wan et al have shown the thermal conductivity improvement of PANI (nanofibres)based NFs in DI-water due to uniform morphology as well as high crystallinity. 25 The thermal conductivity transition of polymer fibres ranging from low to high values, with crystallinity has been reported.…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity, rheology and stability analysis of 2D tungsten disulphide‐doped polyaniline‐based nanofluids: An experimental investigation

et al. 2020

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Summary In this study, polyaniline (PANI) nanocomposite‐based nanofluids (NFs) in ethylene glycol were obtained with a two‐step method by varying volume concentrations from 0.005% to 0.02%. Tungsten disulphide (WS2) nanoparticles were doped in PANI having different weight percentage (1%, 2% and 5%) via oxidative in situ polymerization employing ammonium persulphate oxidant in an acidic environment. The nanocomposites were comprehensively characterised using various techniques, such as Fourier transform infrared spectroscopy, thermogravimetric analysis, field emission scanning electron microscopy and high‐resolution transmission electron microscopy. The formulated NFs were extensively investigated with zeta‐sizer, particle size analyzer, thermal property analyzer and rheometer in a temperature range of 25°C to 70°C. The zeta potential results (up to 54.5 mV) were evident of extraordinary stability of NFs at all targeted temperatures along with polydispersity index <30% and mean particle/agglomerate size in the range of 335.8 to 489 nm. Additionally, a remarkable thermal conductivity improvement (~20.7%) was achieved with intrinsic PANI‐based NFs at an operating temperature of 50°C. Subsequently, it varied substantially with WS2 doping within PANI matrix and reached to 117.9%. Furthermore, the rheological measurements have revealed the viscoelastic nature of NFs along with a remarkable reduction in apparent viscosity (up to 8.4%). The temperature sweep viscosity indicated the transition of relative viscosity from high to low at a critical temperature of about 55°C. The NF10 (WS2 + PANI 5, at 0.005 vol%) was found to be the best candidate with 63.8% thermal conductivity enhancement and 6.4% viscosity reduction as compared with the base fluid at an operating temperature of 50°C. Thus, WS2 doping within PANI has proved to be crucial in the proliferation of thermal conductivity and mitigation of viscosity.

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Polymer compounds with high thermal conductivity

Cited by 16 publications

References 0 publications

Importance of Melt Flow Direction during Injection Molding on Polymer Heat Sinks’ Cooling Efficiency

Importance of Melt Flow Direction during Injection Molding on Polymer Heat Sinks’ Cooling Efficiency

Contacting of inserts with the integrated metal/plastic injection moulding

Thermal conductivity, rheology and stability analysis of 2D tungsten disulphide‐doped polyaniline‐based nanofluids: An experimental investigation

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