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Polymers 2018, 10(7), 693; https://doi.org/10.3390/polym10070693

High Thermal Conductivity of Flake Graphite Reinforced Polyethylene Composites Fabricated by the Powder Mixing Method and the Melt-Extruding Process

1
School of Energy and Power Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China
2
College of Electromechanical Engineering, Qingdao University of Science & Technology, Qingdao 266061, China
*
Authors to whom correspondence should be addressed.
Received: 21 May 2018 / Revised: 10 June 2018 / Accepted: 20 June 2018 / Published: 21 June 2018
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Abstract

The thermal conductivity of flake graphite (FG) particulates reinforced high density polyethylene (HDPE) composites was systematically investigated under a special dispersion state of FG particles. The effects of particle size, weight filling ratio and proportion of various sizes were discussed in detail. A special composite (15 wt % 500 μm/10 wt % 200 μm/10 wt % 20 μm/5 wt % 2 μm FG + 60 wt % polyethylene (PE)) with a high thermal conductivity about 2.49 W/(m·K) was produced by combining the synergistic effect of several fillers. The component material size distribution was employed to analyze the effect of particle size. And scanning electron microscope (SEM) was adopted to observe the FG network in the composites. Thermogravimetric analysis (TGA) revealed the good thermal stability of composites. Differential scanning calorimetry (DSC) indicated that all composites own a similar melting temperature. Sample compression experiment indicated that all composites still exhibit high mechanical strength. Consequently, the easy-making flake graphite reinforced polyethylene composites with a high thermal conductivity would have a wide application in the new material field, such as a thermal interface material, a heat exchanger, voltage cable, etc. View Full-Text
Keywords: polyethylene; flake graphite; composites; synergistic effect; thermal conductivity polyethylene; flake graphite; composites; synergistic effect; thermal conductivity
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Liu, Z.; Tu, R.; Liao, Q.; Hu, H.; Yang, J.; He, Y.; Bian, H.; Ma, L.; Liu, W. High Thermal Conductivity of Flake Graphite Reinforced Polyethylene Composites Fabricated by the Powder Mixing Method and the Melt-Extruding Process. Polymers 2018, 10, 693.

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