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Graphite–graphene hybrid filler system for high thermal conductivity of epoxy composites

Published online by Cambridge University Press:  16 April 2015

Nayandeep K. Mahanta ,
Marcio R. Loos ,
Ica Manas Zlocozower  and
Alexis R. Abramson
Nayandeep K. Mahanta
Affiliation:
Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA
Marcio R. Loos
Affiliation:
Federal University of Santa Catarina, Blumenau 89065-300Brazil
Ica Manas Zlocozower
Affiliation:
Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA
Alexis R. Abramson*
Affiliation:
Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA
*
a)Address all correspondence to this author. e-mail: alexis.abramson@case.edu
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Abstract

The thermal conductivities of epoxy composites of mixtures of graphite and graphene in varying ratios were measured. Thermal characterization results showed unexpectedly high conductivities at a certain ratio filler ratio. This phenomenon was exhibited by samples with three different overall filler concentrations (graphene + graphite) of 7, 14, and 35 wt%. The highest thermal conductivity of 42.4 ± 4.8 W/m K (nearly 250 times the thermal conductivity of pristine epoxy) was seen for a sample with 30 wt% graphite and 5 wt% graphene when characterized using the dual-mode heat flow meter technique. This significant improvement in thermal conductivity can be attributed to the lowering of overall thermal interface resistance due to small amounts of nanofillers (graphene) improving the thermal contact between the primary microfillers (graphite). The synergistic effect of this hybrid filler system is lost at higher loadings of the graphene relative to graphite. Graphite and graphene mixed in the ratio of 6:1 yielded the highest thermal conductivities at three different filler loadings.

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Articles
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Journal of Materials Research , Volume 30 , Issue 7 , 14 April 2015 , pp. 959 - 966
Copyright
Copyright © Materials Research Society 2015 

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