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Structure-Electrical Transport Property Relationship of Anisotropic iPP/CNT Films

Published online by Cambridge University Press:  22 March 2013

Parvathalu Kalakonda ,
Michael Daly ,
Kaikai Xu ,
Yaniel Cabrera ,
Robert Judith ,
Germano S. Iannacchione ,
Georgi Y. Georgiev  and
Peggy Cebe
Parvathalu Kalakonda
Affiliation:
Department of Physics, Worcester Polytechnic Institute, Worcester, MA 01609, USA
Michael Daly
Affiliation:
Department of Natural Sciences - Physics, Assumption College, Worcester, MA 01609, USA
Kaikai Xu
Affiliation:
Department of Natural Sciences - Physics, Assumption College, Worcester, MA 01609, USA
Yaniel Cabrera
Affiliation:
Department of Physics, Tufts University, Medford, MA 02155, USA
Robert Judith
Affiliation:
Department of Physics, Tufts University, Medford, MA 02155, USA
Germano S. Iannacchione
Affiliation:
Department of Physics, Worcester Polytechnic Institute, Worcester, MA 01609, USA
Georgi Y. Georgiev*
Affiliation:
Department of Physics, Worcester Polytechnic Institute, Worcester, MA 01609, USA Department of Natural Sciences - Physics, Assumption College, Worcester, MA 01609, USA
Peggy Cebe
Affiliation:
Department of Physics, Tufts University, Medford, MA 02155, USA
*
*corresponding author: [email protected]; [email protected]
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Abstract

The internal micro/nano-structure of anisotropically oriented polymer/CNTs composites determines their macroscopic properties. However, the connections between the two are not fully understood. The varying of CNT concentration, preparation method, and a thermodynamic parameter (e.g. temperature) can all play interconnected role. In this work, the macroscopic electrical conductivity was measured perpendicular to the film thickness of an insulating polymer (isotactic PolyPropylene, iPP) and a nano-composite of iPP with 5 weight percent of CNT. The thin films studied were sheared (anisotropically nano-structured) and non-sheared (with random internal structure). In general the effect of melt shearing induces anisotropy on the electrical transport properties of the iPP/CNT films in directions parallel and perpendicular to the direction of orientation. Our results show that for the pure iPP, resistivity slightly increases with shear at higher temperatures. When CNTs are introduced, there is a large difference between the resistivity of the sheared and non-sheared nanocomposite. The sheared PNCs when the CNTs are aligned parallel to each other, have higher resistivity, which is possibly due to the higher concentration at which the percolation threshold occurs in this arrangement. The resistivity decreases overall, as the temperature increases from 0 to 50 °C. These results show that CNTs can be used to control and fine tune the desired macroscopic physical properties of nanocomposites, by concentration and orientation, such as electrical conductivity, for applications where such properties are necessary.

Keywords

polymerfilmmicrostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1499: Symposium N – Precision Polymer Materials―Fabricating Functional Assemblies, Surfaces, Interfaces and Devices , 2013 , mrsf12-1499-n05-83
Copyright
Copyright © Materials Research Society 2013

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References

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