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Thermal Transport Properties of Melt-Shear Oriented iPP/Carbon Nanotube Thin Films

Published online by Cambridge University Press:  21 February 2012

Parvathalu Kalakonda ,
Erin A. Gombos ,
Georgi Y. Georgiev ,
Germano S. Iannacchione  and
Peggy Cebe
Parvathalu Kalakonda
Affiliation:
Department of Physics, WPI, Worcester, MA 01609, U.S.A.
Erin A. Gombos
Affiliation:
Department of Natural Sciences, Assumption College, Worcester, MA 01609, U.S.A.
Georgi Y. Georgiev
Affiliation:
Department of Natural Sciences, Assumption College, Worcester, MA 01609, U.S.A. Department of Physics and Astronomy, Tufts University, Medford, MA 02155, U.S.A.
Germano S. Iannacchione
Affiliation:
Department of Physics, WPI, Worcester, MA 01609, U.S.A.
Peggy Cebe
Affiliation:
Department of Physics and Astronomy, Tufts University, Medford, MA 02155, U.S.A.
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Abstract

Transport properties of polymer nanocomposites become increasingly important for range applications with many outstanding questions remaining. Thermal conductivity is especially important in applications like temperature sensing and packaging. We chose isotactic PolyPropylene (iPP) as one of the most widely used polymers and created nano-colloidal dispersions at different weight percent concentration of carbon nanotubes (CNTs). We oriented the thin-film samples using melt-shear at 200°C and 1Hz in a Linkam microscope shearing hot stage. Thermal conductivity measurements were performed at room temperature on two iPP/CNT sheared thin-film samples (1% and 5% CNT content) both parallel and perpendicular to the shear direction as well as a pure iPP sheared thin-film, prepared using the same process. Our findings indicate that the CNTs enhance kappa by 12% for the 1% CNT sample and 35% by the 5% CNT sample compared to that measured for pure iPP. Additionally, the CNTs under shear induce a novel anisotropy to the thermal conductivity in iPP/CNTs nano-composites. We introduce an approach to extract the shear induced orientational order of thermal conductivity by the dispersed CNTs.

Keywords

polymerfilmthermal conductivity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1410: Symposium DD – Transport Properties in Polymer Nanocomposites II , 2012 , mrsf11-1410-dd04-01
Copyright
Copyright © Materials Research Society 2012

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References

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