High Through-Plane Thermal Conduction of Graphene Nanoflake Filled Polymer Composites Melt-Processed in an L-Shape Kinked Tube

Haejong Jung, Seunggun Yu, Nam Seok Bae, Suk Man Cho, Richard Hahnkee Kim, Sung Hwan Cho, Ihn Hwang, Beomjin Jeong, Ji Su Ryu, Junyeon Hwang, Soon Man Hong, Chong Min Koo, Cheolmin Park

Research output: Contribution to journalArticle

87 Citations (Scopus)

Abstract

Design of materials to be heat-conductive in a preferred direction is a crucial issue for efficient heat dissipation in systems using stacked devices. Here, we demonstrate a facile route to fabricate polymer composites with directional thermal conduction. Our method is based on control of the orientation of fillers with anisotropic heat conduction. Melt-compression of solution-cast poly(vinylidene fluoride) (PVDF) and graphene nanoflake (GNF) films in an L-shape kinked tube yielded a lightweight polymer composite with the surface normal of GNF preferentially aligned perpendicular to the melt-flow direction, giving rise to a directional thermal conductivity of approximately 10 W/mK at 25 vol % with an anisotropic thermal conduction ratio greater than six. The high directional thermal conduction was attributed to the two-dimensional planar shape of GNFs readily adaptable to the molten polymer flow, compared with highly entangled carbon nanotubes and three-dimensional graphite fillers. Furthermore, our composite with its density of approximately 1.5 g/cm3 was mechanically stable, and its thermal performance was successfully preserved above 100 °C even after multiple heating and cooling cycles. The results indicate that the methodology using an L-shape kinked tube is a new way to achieve polymer composites with highly anisotropic thermal conduction.

Original languageEnglish
Pages (from-to)15256-15262
Number of pages7
JournalACS Applied Materials and Interfaces
Volume7
Issue number28
DOIs
Publication statusPublished - 2015 Jul 22
Externally publishedYes

Keywords

  • graphene nanoflake
  • L-shape kinked tube
  • orientation
  • poly(vinylidene fluoride)
  • polymer composite
  • thermal conductivity

ASJC Scopus subject areas

  • Materials Science(all)

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  • Cite this

    Jung, H., Yu, S., Bae, N. S., Cho, S. M., Kim, R. H., Cho, S. H., Hwang, I., Jeong, B., Ryu, J. S., Hwang, J., Hong, S. M., Koo, C. M., & Park, C. (2015). High Through-Plane Thermal Conduction of Graphene Nanoflake Filled Polymer Composites Melt-Processed in an L-Shape Kinked Tube. ACS Applied Materials and Interfaces, 7(28), 15256-15262. https://doi.org/10.1021/acsami.5b02681