Thermal and electrical conductivity of carbon–filled liquid crystal polymer composites

King, Julia A.; Miller, Michael G.; Barton, Rodwick L.; Keith, Jason M.; Hauser, R.; Peterson, Karl; Sutter, Lawrence

doi:10.1002/app.22452

Cited by 31 publications

(27 citation statements)

References 20 publications

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“…The fillers in the through‐plane samples were primarily oriented transverse to the electrical resistivity measurement direction. These observations agreed with prior work, and additional photomicrographs can be seen elsewhere 31, 35, 36, 38, 39…”

Section: Resultssupporting

confidence: 91%

Electrical conductivity of carbon‐filled polypropylene‐based resins

King

Johnson

Via

et al. 2008

J of Applied Polymer Sci

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Adding conductive carbon fillers to insulating thermoplastic resins increases composite electrical conductivity. Often, as much of a single type of carbon filler is added to achieve the desired conductivity and still allow the material to be molded into a bipolar plate for a fuel cell. In this study, various amounts of three different carbons (carbon black, synthetic graphite particles, and carbon nanotubes) were added to polypropylene resin. The resulting single-filler composites were tested for electrical resistivity (1/electrical conductivity). The effects of single fillers and combinations of the different carbon fillers were studied via a factorial design. The percolation threshold was 1.4 vol % for the composites containing only carbon black, 2.1 vol % for those containing only carbon nanotubes, and 13 vol % for those containing only synthetic graphite particles. The factorial results indicate that the composites containing only single fillers (synthetic graphite followed closely by carbon nanotubes and then carbon black) caused a statistically significant decrease in composite electrical resistivity. All of the composites containing combinations of different fillers had a statistically significant effect that increased the electrical resistivity.

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Section: Resultssupporting

confidence: 91%

Electrical conductivity of carbon‐filled polypropylene‐based resins

King

Johnson

Via

et al. 2008

J of Applied Polymer Sci

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“…These results show good agreement with values obtained from prior work for nylon, polycarbonate and LCP resins 48–50. Photomicrographs showing the orientation of the synthetic graphite are shown elsewhere 36, 44, 48, 49, 51. Photomicrographs showing the dispersion of carbon nanotubes and carbon black are shown elsewhere 38.…”

Section: Resultssupporting

confidence: 88%

Effects of carbon fillers on tensile and flexural properties in polypropylene‐based resins

Gaxiola

Jubinski

Keith

et al. 2010

J of Applied Polymer Sci

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A potential application for conductive resins is in bipolar plates for use in fuel cells. The addition of carbon filler can increase the electrical and thermal conductivities of the polymer matrix but will also have an effect on the tensile and flexural properties, important for bipolar plates. In this research, three different types of carbon (carbon black, synthetic graphite, and carbon nanotubes) were added to polypropylene and the effects of these single fillers on the flexural and tensile properties were measured. All three carbon fillers caused an increase in the tensile and flexural modulus of the composite. The ultimate tensile and flexural strengths decreased with the addition of carbon black and synthetic graphite, but increased for carbon nanotubes/polypropylene composites due to the difference in the aspect ratio of this filler compared to carbon black and synthetic graphite. Finally, it was found that the Nielsen model gave the best prediction of the tensile modulus for the polypropylene based composites.

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“…The fillers in the through-plane samples are primarily oriented transverse to the through-plane thermal conductivity measurement direction. These observations agree with prior work and photomicrographs can be seen elsewhere [19,[36][37][38][39]. Figures 4-6 show the mean through plane thermal conductivity for the single filler composites as a function of filler volume fraction at 558C (as close to ambient temperature as can be measured and still have a temperature gradient in the apparatus) and 808C (typical fuel cell operating temperature) measured by the guarded heat flow method.…”

Section: Filler Length Aspect Ratio and Orientation Resultssupporting

confidence: 87%

Synergistic Effects of Carbon Fillers in Thermally Conductive Liquid Crystal Polymer Based Resins

King

Hauser

Tomson

et al. 2008

Journal of Composite Materials

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Thermally conductive resins are needed for fuel cell bipolar plates. Varying amounts of three different carbons (carbon black, synthetic graphite particles, and carbon fiber) were added to Vectra A950RX Liquid Crystal Polymer. The resulting single filler composites were tested for thermal conductivity. In addition, the effects of single fillers and combinations of two different carbon fillers were studied via a factorial design. Synthetic graphite caused the largest statistically significant increase in composite through plane and in plane thermal conductivity. Composites containing synthetic graphite/carbon black and synthetic graphite/carbon fiber caused a statistically significant increase in through plane and in plane thermal conductivity.

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Thermal and electrical conductivity of carbon–filled liquid crystal polymer composites

Cited by 31 publications

References 20 publications

Electrical conductivity of carbon‐filled polypropylene‐based resins

Electrical conductivity of carbon‐filled polypropylene‐based resins

Effects of carbon fillers on tensile and flexural properties in polypropylene‐based resins

Synergistic Effects of Carbon Fillers in Thermally Conductive Liquid Crystal Polymer Based Resins

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