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Aribou, Najoia
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Publications (5/5 displayed)
- 2022Dielectric spectroscopy of melt-mixed polypropylene and pyrolytically stripped carbon nanofiber compositescitations
- 2022Electrical properties of melt-mixed polypropylene and as-grown carbon nanofiber composites: analysis of their interphase via the AC conductivity modelingcitations
- 2022Electrical properties of polypropylene-based composites melt-processed with as-grown carbon nanofibers
- 2020Structural, Electrical and Thermal Properties of Composites Based on Conducting Polymercitations
- 2020Interphase approach for modeling the DC conductivity of diverse allotropic types of carbon-reinforced polymer compositescitations
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article
Dielectric spectroscopy of melt-mixed polypropylene and pyrolytically stripped carbon nanofiber composites
Abstract
In this work, pyrolytically stripped carbon nanofiber (CNF) polypropylene (PP) composites were synthesized following a scalable melt-mixing method, and the effects of CNF weight concentrations on the electrical conductivity, dielectric permittivity, electrical modulus and electrical impedance of PP/CNF composites were studied. Quite unexpectedly, the electrical conductivity of PP/CNF composites improved only slightly as the incorporation of CNFs was raised, yielding a maximum of ~10−10 S m−1 for PP/CNF 5 wt. % composites. The increase corresponded to a gradual improvement of the dielectric constant up to a maximum of ~9 for PP/CNF 5 wt. % composites at 1 MHz, which was attributed to the raise of interface polarization effect. Moreover, the Cole–Cole model was used to analyze the effects of CNF concentrations on the dielectric relaxation of PP/CNF composites, from which was deduced that the incorporation of CNFs increases their dielectric strength and relaxation times. The analysis gathered here aims to provide a better insight into the enhanced dielectric properties observed in low-conducting polymer composites filled with CNFs. ; A. J. Paleo gratefully acknowledges support from FCT-Foundation for Science and Technology by the project UID/CTM/00264/2021 of 2C2T under the COMPETE and FCT/MCTES (PIDDAC) co-financed by FEDER through the PT2020 program and “plurianual” 2020–2023 Project UIDB/00264/2020.