Journal
JOURNAL OF COMPOSITE MATERIALS
Volume 44, Issue 7, Pages 839-855Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0021998309347578
Keywords
thermal conductivity; carbon black; polypropylene; composites; nanoflash; carbon nanotubes; synthetic graphite
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Funding
- Department of Energy [DE-FG36-08GO88104]
- American Leistritz
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Varying amounts of three different carbons (carbon black, synthetic graphite particles, and carbon nanotubes) were added to polypropylene, and the resulting single-filler composites were tested for thermal conductivity using the nano-flash test method. In addition, the effects of single fillers and combinations of different carbon fillers were studied via a factorial design. Each single filler caused a statistically significant increase in through-plane thermal conductivity at the 95% confidence level, with synthetic graphite causing the largest increase, followed by carbon nanotubes, and then carbon black. The synthetic graphite/carbon nanotube formulations, followed by the carbon black/synthetic graphite formulations also caused a statistically significant increase in composite through-plane thermal conductivity. Composites containing 75 and 80 wt% synthetic graphite in polypropylene had an in-plane thermal conductivity of 24 and 34 W/m.K, respectively. This meets the thermal conductivity target of >20 W/m.K for fuel cell bipolar plates.
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