Dielectric Spectroscopy of Melt-Mixed Polypropylene and Pyrolytically Stripped Carbon Nanofiber Composites

• Type: Article in International Scientific Journal
• Date: 2022

Authors

Samir, Z (Author) Other; Paleo, AJ (Author) Other; Aribou, N (Author) Other; Nioua, Y (Author) Other; da Silva, JO (Author) Other; Cerqueira, MF (Author) Other; Agostinho Moreira, JA (Author) FCUP; Achour, ME (Author) Other

Journal

The Journal is awaiting validation by the Administrative Services.

Title: Journal of Composites Science

Vol. 6

Final page: 368

ISSN: 2504-477X

Publisher: Multidisciplinary Digital Publishing Institute (MDPI)

Indexing

ISI Web of Knowledge - 2 Citations

Other information

Authenticus ID: P-00X-J7Z

DOI: 10.3390/jcs6120368

Abstract (EN): 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 similar to 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 similar to 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13