Improvement of electric conductivity of LLDPE based nanocomposite by paraffin coating on exfoliated graphite nanoplatelets

Sumin Kim, Jungki Seo, Lawrence T. Drzal

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)


Paraffin coated exfoliated graphite nanoplatelets (xGnP) reinforced with Linear Low-Density PolyEthylene (LLDPE) nanocomposites have been fabricated and characterized for mechanical, electrical and morphological properties. Paraffin was added to decrease the percolation threshold of electric conductivity. LLDPE-paraffin/xGnP nanocomposites were prepared by separate solution and total solution mixing methods. The mixture master batch of each mixing method was injection-molded to produce composites with a mini twin-screw extruder. The separate mixing method was not suitable since there was not enough electrical conductivity due to the low xGnP content in the nanocomposites. However, paraffin does not affect mechanical properties until around 30 wt% of content has been added, even though the content is low molecular weight polyethylene. When the total mixing method was used, the adding content of xGnP and paraffin was easily controlled. Five weight percentage of xGnP loaded nanocomposite showed electrical conductivity when 10 wt% of paraffin was added. From the results of SEM images of fracture surface and DSC, it could be seen that Paraffin was well coated on xGnP, resulting in a separate phase between xGnP and LLDPE. By coating paraffin on xGnP in the LLDPE matrix, the percolation threshold dramatically decreased compared to the xGnP-LLDPE nanocomposite.

Original languageEnglish
Pages (from-to)581-587
Number of pages7
JournalComposites Part A: Applied Science and Manufacturing
Issue number5
Publication statusPublished - 2010 May

Bibliographical note

Funding Information:
This work is the outcome of a Manpower Development Program for Energy and Resources supported by the Ministry of Knowledge and Economy (MKE).

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Mechanics of Materials


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