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Authors
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Aribou, N.; Paleo, A. J.; Toledano, O.; Krause, B.; Cerqueira, M. F.; Ezquerra, T. A.; Achour, M. E.
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Title
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Broadband dielectric permittivity analysis and modelling of polypropylene/pyrograf® III carbon nanofiber composites prepared by melt-extrusion
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Date
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08.04.2026
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Number
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0
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Abstract
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This study investigates the broadband dielectric spectroscopy (BDS) at room temperature of composites of polypropylene (PP) melt-mixed with up to 5 wt% of Pyrograf® III carbon nanofibers (CNFs) in the range 0.05–106 Hz. Scanning electron microscopy (SEM) shows randomly distributed CNF agglomerates, while Raman spectroscopy shows that the melt-mixing processing does not appear to affect the initial structure of CNFs. The BDS results reveal low, weakly dispersive dielectric permittivity for CNF contents below 4 wt%, indicating limited interfacial polarization, whereas for 5 wt%, the combination of an increase in low-frequency dielectric permittivity, high-frequency relaxation, and emerging dielectric loss effects, indicate the formation of a percolated CNF network. To analyze these results, the Jonscher’s Universal Dielectric Response (JUDR), the Havriliak–Negami (HN) and the modified Havriliak–Negami models (MHN), this latter incorporating conduction and electrode polarization, are discussed in this work.
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Publisher
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Elsevier
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Wikidata
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Citation
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Materials Research Bulletin 201 (2026) 114150
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DOI
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https://doi.org/10.1016/j.materresbull.2026.114150
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Tags
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