Theoretical Prediction of Electrical Conductivity Percolation of Poly(lactic acid)—Carbon Nanotube Composites in DC and RF Regime

Author:

Beltrán Freddys R.12ORCID,Aksas Hammouche3,Sidi Salah Lakhdar3ORCID,Danlée Yann4ORCID,Huynen Isabelle4ORCID

Affiliation:

1. Departamento Ingeniería Química Industrial y Medio Ambiente, E.T.S.I. Industriales, Universidad Politécnica de Madrid, 28006 Madrid, Spain

2. Research Group “Polímeros, Caracterización y Aplicaciones (POLCA)”, Universidad Politécnica de Madrid, 28006 Madrid, Spain

3. Research Unit Materials, Processes and Environment (URMPE), Faculty of Technology, M’Hamed Bougara University, Boumerdes 35000, Algeria

4. Institute of Information and Communication Technologies, Electronics and Applied Mathematics (ICTEAM), Université Catholique de Louvain, Place du Levant 3, 1348 Louvain-la-Neuve, Belgium

Abstract

Polymer composites based on polylactic acid (PLA) reinforced with 0.25–5 wt.% of carbon nanotubes (CNTs) were synthesized by melt blending. The static (DC) and microwave (RF) electrical conductivity have been investigated on the PLA–CNT composites. The electrical percolation threshold has been theoretically determined using classical models of percolation in order to predict the conductivity of the different nanocomposites. Through the fitting process, it has been found that the percolation threshold is obtained at 1 wt.% of CNTs in the DC regime and reached below 0.25 wt.% of CNTs in the microwave regime. Among the Mamunya, McLachlan, or GEM models, the McCullough model remarkably fits the experimental DC and RF electrical conductivities. The obtained results are correlated to the electrical properties of a range of CNT-based composites, corresponding to the percolation threshold required for a three-dimensional network of CNTs into the polymer matrix.

Funder

Fonds de la Recherche Scientifique

The European Union’s Horizon 2020 research and innovation program

MINECO-Spain

Publisher

MDPI AG

Subject

General Materials Science

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