Effect of aspect ratio on thermal conductivity of high density polyethylene/multi-walled carbon nanotubes nanocomposites |
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| Affiliation: | 1. Dokuz Eylul University, Engineering Faculty, Mechanical Engineering Department, Tinaztepe Campus, 35397, Buca, Izmir, Turkey;2. Dokuz Eylul University, The Graduate School of Natural and Applied Sciences, Mechanical Engineering Department, Tinaztepe Campus, 35397, Buca, Izmir, Turkey;3. Multiscale Thermophysics Lab. GRESPI, Université de Reims Champagne Ardenne URCA, Moulin de la Housse, BP 1039, 51687 Reims, France;4. Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava 45, Slovak Republic;1. State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, PR China;2. RKT Centre for Polymer Micro and Nano Technology University of Bradford, United Kingdom;1. Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Collaborative Innovation Center for Advanced Origanic Chemical Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan, 430062, PR China;2. Centre for Advanced Materials Technology (CAMT), School of Aerospace, Mechanical and Mechatronic Engineering J07, The University of Sydney, Sydney, NSW 2006, Australia;3. Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, PR China;1. University of Rostock, Institute of Physics, Wismarsche Str. 43-45, 18051 Rostock, Germany;2. Fraunhofer Institute for Structural Durability and System Reliability LBF, Division Plastics, Schlossgartenstr. 6, 64289 Darmstadt, Germany;3. Leibniz Institute of Polymer Research Dresden, Hohe Str. 6, D-01069 Dresden, Germany;4. EMPA-Swiss Federal Laboratories for Materials Science and Technology, Feuerwerkstr. 39, CH-3602 Thun, Swizerland;1. Centre of Nanotechnology, Indian Institute of Technology Roorkee, Uttarakhand 247667, India;2. Biomaterials and Multiscale Mechanics Lab, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Uttarakhand 247667, India |
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| Abstract: | This study aims to investigate experimentally the effects of aspect ratio (length/diameter ratio) and concentration of multiwalled carbon nanotubes (MWCNTs) on thermal properties of high density polyethylene (HDPE) based composites. The aspect ratios of two types of MWCNT fillers are in the range of 200–400 and 500–3000. Composite samples were prepared by melt mixing up to weight fraction of 19% filler content, followed by a compression molding. Measurements of density, specific heat and thermal diffusivity (by modulated photothermal radiometry, PTR) were performed and effective thermal conductivities ke of nanocomposites were calculated using these values. The results show that the composites containing MWCNTs with higher aspect ratio have higher thermal conductivities than the ones with lower aspect ratio. In terms of conductivity enhancement ke/km − 1, the results indicate that MWCNTs with higher aspect ratio provide three to fourfold larger enhancement than the ones with lower aspect ratio, at low filler concentrations. |
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| Keywords: | A. Carbon nanotubes and nanofibers A. Nanocomposites A. Polymer-matrix composites (PMCs) B. Thermal properties |
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