Rheological and electrical analysis in carbon nanofiber reinforced polypropylene composites

Authors

  • Antonio J. Paleo,

    Corresponding author
    1. Institute for Polymers and Composites (IPC), University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal
    • Institute for Polymers and Composites (IPC), University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal
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  • J. Silva,

    1. Department of Macromolecular Science and Engineering, Case Western Reserve University, Center for Layered Polymeric Systems (CLiPS), Kent Hale Smith Bldg., Room No. 341, 2100 Adelbert Road, Cleveland, Ohio 44106-7202
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  • F. W. J. van Hattum,

    1. Institute for Polymers and Composites (IPC), University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal
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  • Senentxu Lanceros-Méndez,

    1. Center/Department of Physics, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
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  • A. I. Ares

    1. Grupo de Polímeros, Departamento de Física, Universidade de A Coruña, Laboratorio de Polímeros, E.U.P. Avda 19 Febrero, s/n 15405-Ferrol, España
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Abstract

Two different types of carbon nanofibers (CNF) were incorporated in the same polypropylene (PP) matrix by twin-screw extrusion. The electrical characterization of both CNFs/PP composites as a function of volume fraction show different electrical performance: conducting and nonconducting. The objective of this work is to study the rheological behavior of both composites with the aim of relating it to the electrical behavior. The results indicate that the rheological behaviors are different, suggesting that rheology differentiates the microstructural variations responsible for the electrical performance. Furthermore, the main rheological parameters were correlated to the electrical conductivity. The results show that G′/G″ and G′ are the most sensitive parameters when compared with the onset of electrical percolation. Finally, in spite of the intrinsic measuring differences between electrical and rheological analysis, the two calculated thresholds are very similar: ∼0.5 for the rheological and ∼0.4 for the electrical. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2013

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