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Titre: Predictive optimization of electrical conductivity of polycarbonate composites at different concentrations of carbon nanotubes: A valorization of conductive nanocomposite theoretical models
Auteur(s): Sidi Salah, Lakhdar
Ouslimani, Nassira
Chouai, Mohamed
Danlée, Yann
Huynen, Isabelle
Aksas, Hammouche
Mots-clés: Carbon nanotubes (CNTs)
Electrical conductivity
Hyperparameter
Microwave
Optimization
Percolation
Polycarbonate (PC)
Date de publication: 2021
Editeur: MDPI
Collection/Numéro: Materials/ Vol.14, N°7 (2021);
Résumé: Polycarbonate—carbon nanotube (PC-CNT) conductive composites containing CNT concentration covering 0.25–4.5 wt.% were prepared by melt blending extrusion. The alternating current (AC) conductivity of the composites has been investigated. The percolation threshold of the PC-CNT composites was theoretically determined using the classical theory of percolation followed by numerical analysis, quantifying the conductivity of PC-CNT at the critical volume CNT concentration. Different theoretical models like Bueche, McCullough and Mamunya have been applied to predict the AC conductivity of the composites using a hyperparameter optimization method. Through multiple series of the hyperparameter optimization process, it was found that McCullough and Mamunya theoretical models for electrical conductivity fit remarkably with our experimental results; the degree of chain branching and the aspect ratio are estimated to be 0.91 and 167 according to these models. The development of a new model based on a modified Sohi model is in good agreement with our data, with a coefficient of determination R2 = 0.922 for an optimized design model. The conductivity is correlated to the electromagnetic absorption (EM) index showing a fine fit with Steffen–Boltzmann (SB) model, indicating the ultimate CNTs volume concentration for microwave absorption at the studied frequency range. © 2021 by the authors. Licensee MDPI, Basel, Switzerland
URI/URL: https://doi.org/10.3390/ma14071687
https://www.mdpi.com/1996-1944/14/7/1687/htm
http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/6971
ISSN: 19961944
Collection(s) :Publications Internationales

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