Thermal stability and dynamic mechanical behavior of exfoliated graphite nanoplatelets-LLDPE nanocomposites

Sumin Kim, Inhwan Do, Lawrence T. Drzal

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Abstract

The objective of this research was to investigate thermal stability and dynamic mechanical behavior of Exfoliated graphite nanoplatelets (xGnP TM)-Linear Low- Density Poly Ethylene (LLDPE) nanocomposites with different xGnP loading content. The xGnP-LLDPE nanocomposites were fabricated by solution and melt mixing in various screw rotating systems such as co-, counter-, and modified-corotating. The storage modulus (E′) of the composites at the starting point of -50°C increased as xGnP contents increased. E′ of the nanocomposite with only 7 wt% of xGnP was 2.5 times higher than that of the control LLDPE. Thermal expansion and the coefficient of thermal expansion of xGnP- loaded composites were much lower than those of the control LLDPE in the range of 45-80°C (299.8 × 10-6/ °C) and 85-100°C (365.3 × 10-6/°C). Thermal stability of the composites was also affected by xGnP dispersion in LLDPE matrix. The xGnP-LLDPE nanocomposites by counter-rotating screw system showed higher thermal stability than ones by co-rotating and modified-co- rotating system at 5 wt% and 12 wt% of xGnP. xGnP had a great effect on high thermal stability of xGnP- LLDPE composites to be applied as tube and film for electrical materials.

Original languageEnglish
Pages (from-to)755-761
Number of pages7
JournalPolymer Composites
Volume31
Issue number5
DOIs
Publication statusPublished - 2010 May 1

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Polymers and Plastics
  • Materials Chemistry

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