Effect of cooling rate on the properties of high density polyethylene/multi-walled carbon nanotube composites

Dong Xiang, Eileen Harkin-Jones, David Linton

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

High density polyethylene (HDPE)/multi-walled carbon nanotube (MWCNT) nanocomposites were prepared by melt mixing using twin-screw extrusion. The extruded pellets were compression moulded at 200°C for 5min followed by cooling at different cooling rates (20°C/min and 300°C/min respectively) to produce sheets for characterization. Scanning electron microscopy (SEM) shows that the MWCNTs are uniformly dispersed in the HDPE. At 4 wt% addition of MWCNTs composite modulus increased by over 110% compared with the unfilled HDPE (regardless of the cooling rate). The yield strength of both unfilled and filled HDPE decreased after rapid cooling by about 10% due to a lower crystallinity and imperfect crystallites. The electrical percolation threshold of composites, irrespective of the cooling rate, is between a MWCNT concentration of 1∼2 wt%. Interestingly, the electrical resistivity of the rapidly cooled composite with 2 wt% MWCNTs is lower than that of the slowly cooled composites with the same MWCNT loading. This may be due to the lower crystallinity and smaller crystallites facilitating the formation of conductive pathways. This result may have significant implications for both process control and the tailoring of electrical conductivity in the manufacture of conductive HDPE/MWCNT nanocomposites.

Original languageEnglish
Title of host publicationProceedings of PPS-30
Subtitle of host publicationThe 30th International Conference of the Polymer Processing Society - Conference Papers
EditorsSadhan C. Jana
PublisherAmerican Institute of Physics Inc.
Volume1664
ISBN (Electronic)9780735413092
DOIs
Publication statusPublished - 22 May 2015
Event30th International Conference of the Polymer Processing Society, PPS 2014 - Cleveland, United States
Duration: 6 Jun 201412 Jun 2014

Conference

Conference30th International Conference of the Polymer Processing Society, PPS 2014
CountryUnited States
CityCleveland
Period6/06/1412/06/14

Keywords

  • Cooling rate
  • High density polyethylene
  • Manufacturing
  • Multi-walled carbon nanotube
  • Polymer composites
  • Processing

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    Xiang, D., Harkin-Jones, E., & Linton, D. (2015). Effect of cooling rate on the properties of high density polyethylene/multi-walled carbon nanotube composites. In S. C. Jana (Ed.), Proceedings of PPS-30: The 30th International Conference of the Polymer Processing Society - Conference Papers (Vol. 1664). [700051] American Institute of Physics Inc.. https://doi.org/10.1063/1.4918440