Melt processing and properties of linear low density polyethylene-graphene nanoplatelet composites

P. Noorunnisa Khanam, M. A. AlMaadeed, M. Ouederni, Eileen Harkin-Jones, Beatriz Mayoral, Andrew Hamilton, Dan Sun

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Composites of Linear Low Density Polyethylene (LLDPE) and Graphene Nanoplatelets (GNPs) were processed using a twin screw extruder under different extrusion conditions. The effects of screw speed, feeder speed and GNP content on the electrical, thermal and mechanical properties of composites were investigated. The inclusion of GNPs in the matrix improved the thermal stability and conductivity by 2.7% and 43%, respectively. The electrical conductivity improved from 10-11 to 10-5 S/m at 150 rpm due to the high thermal stability of the GNPs and the formation of phonon and charge carrier networks in the polymer matrix. Higher extruder speeds result in a better distribution of the GNPs in the matrix and a significant increase in thermal stability and thermal conductivity. However, this effect is not significant for the electrical conductivity and tensile strength. The addition of GNPs increased the viscosity of the polymer, which will lead to higher processing power requirements. Increasing the extruder speed led to a reduction in viscosity, which is due to thermal degradation and/or chain scission. Thus, while high speeds result in better dispersions, the speed needs to be optimized to prevent detrimental impacts on the properties.

LanguageEnglish
Pages63-71
Number of pages9
JournalVacuum
Volume130
Early online date22 Apr 2016
DOIs
Publication statusPublished - 1 Aug 2016

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Linear low density polyethylenes
Graphite
Graphene
polyethylenes
graphene
composite materials
Composite materials
Extruders
Processing
Thermodynamic stability
thermal stability
screws
Thermal conductivity
thermal conductivity
matrices
high speed
Viscosity
viscosity
feeders
electrical resistivity

Keywords

  • Electrical properties
  • Graphene nanoplatelets
  • Mechanical properties
  • Melt processing

Cite this

Noorunnisa Khanam, P. ; AlMaadeed, M. A. ; Ouederni, M. ; Harkin-Jones, Eileen ; Mayoral, Beatriz ; Hamilton, Andrew ; Sun, Dan. / Melt processing and properties of linear low density polyethylene-graphene nanoplatelet composites. In: Vacuum. 2016 ; Vol. 130. pp. 63-71.
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Melt processing and properties of linear low density polyethylene-graphene nanoplatelet composites. / Noorunnisa Khanam, P.; AlMaadeed, M. A.; Ouederni, M.; Harkin-Jones, Eileen; Mayoral, Beatriz; Hamilton, Andrew; Sun, Dan.

In: Vacuum, Vol. 130, 01.08.2016, p. 63-71.

Research output: Contribution to journalArticle

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