Dielectric Spectroscopy of Melt-Mixed Polypropylene and Pyrolytically Stripped Carbon Nanofiber Composites
| Autor: | Zineb Samir, Antonio J. Paleo, Najoia Aribou, Yassine Nioua, Jaime Oliveira da Silva, Maria F. Cerqueira, Joaquim Agostinho Moreira, Mohammed E. Achour |
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| Přispěvatelé: | Universidade do Minho |
| Rok vydání: | 2022 |
| Předmět: |
carbon nanofibers
polypropylene electrical conductivity dielectric permittivity electrical modulus electrical impedance Electrical impedance Science & Technology Carbon nanofibers Engenharia e Tecnologia::Engenharia dos Materiais Dielectric permittivity Electrical conductivity Ceramics and Composites Polypropylene Electrical modulus Engineering (miscellaneous) |
| Zdroj: | Journal of Composites Science; Volume 6; Issue 12; Pages: 368 |
| ISSN: | 2504-477X |
| DOI: | 10.3390/jcs6120368 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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