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Journal of Nanomaterials
Volume 2017, Article ID 9075878, 11 pages
https://doi.org/10.1155/2017/9075878
Research Article

Polypropylene Carbon Nanotubes Nanocomposites: Combined Influence of Block Copolymer Compatibilizer and Melt Annealing on Electrical Properties

1Information and Communications Technologies, Electronics and Applied Mathematics (ICTEAM), Université Catholique de Louvain, Place du Levant 3, 1348 Louvain-la-Neuve, Belgium
2Institute of Condensed Matter and Nanosciences (IMCN), Université Catholique de Louvain, Croix du Sud 1, 1348 Louvain-la-Neuve, Belgium

Correspondence should be addressed to Isabelle Huynen; eb.niavuolcu@nenyuh.ellebasi

Received 9 March 2017; Accepted 24 May 2017; Published 4 July 2017

Academic Editor: Bhanu P. Singh

Copyright © 2017 Aline Emplit et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We study the influence of melt annealing and the presence of a block copolymer compatibilizer on the electrical properties of polypropylene carbon nanotubes (CNT) nanocomposites from the DC limit to microwave frequencies and link it to the morphological details. We show that the compatibilizer concentration controls three types of morphologies: separate CNT agglomerates, a network of well dispersed but interconnected CNT, and individualized but separate nanotubes. This explains why conductivity reaches an optimum over the whole frequency range at a low compatibilizer concentration. We model the corresponding structures by a semiquantitative schematic equivalent electrical circuit. A key outcome of the work is the understanding and control of dispersion mechanisms in order to optimize the electrical performances for efficient EMI shielding depending on the targeted frequency range.