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

EVGİN T., Koca H. D., Horny N., TURGUT A., Tavman I. H., Chirtoc M., ...More

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING, vol.82, pp.208-213, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 82
  • Publication Date: 2016
  • Doi Number: 10.1016/j.compositesa.2015.12.013
  • Journal Name: COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.208-213
  • Keywords: Carbon nanotubes and nanofibers, Nanocomposites, Polymer-matrix composites (PMCs), Thermal properties, MECHANICAL-PROPERTIES, EPOXY NANOCOMPOSITES, PHYSICAL-PROPERTIES, COMPOSITES, GRAPHITE, LENGTH, FUNCTIONALIZATION, DISPERSION, FILLERS
  • Dokuz Eylül University Affiliated: Yes

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 k(e) 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 k(e)/k(m) - 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. (C) 2015 Elsevier Ltd. All rights reserved.