3 documents found, page 1 of 1
Electrical properties of polypropylene-based composites melt-processed with as-...
Paleo, Antonio J.; Samir, Zineb; Aribou, Najoia; Nioua, Yassine; Moreira, Joaquim Agostinho; Achour, Mohammed EssaidElectrical conductivity, dielectric permittivity, electrical modulus, and electrical impedance of polypropylene (PP) composites melt-processed with different contents of as-grown carbon nanofibers (CNFs) are studied. As expected, the electrical conductivity of PP/CNF composites increased as the incorporation of CNFs is raised in the polymer, yielding a maximum of ∼ 6 ×10−6 S m−1 for PP/CNF 3 wt. % composites. T...
Electrical properties of melt-mixed polypropylene and as-grown carbon nanofiber...
Paleo, Antonio J.; Aribou, Najoia; Nioua, Yassine; Samir, Zineb; Fernandes, Lisete; Moreira, J. Agostinho; Achour, Mohammed E.The morphology, crystallinity, and electrical conductivity (σ′ and σ″) as a function of frequency of polypropylene (PP) melt-extruded with different amounts of as-grown carbon nanofibers (CNFs) from 0 to 1.4 vol. % are examined. The PP/CNF composites present CNF aggregates randomly distributed within the PP and an insulator–conductor transition at CNF contents near 0.9 vol. %. The degree of crystallinity of PP/...
Dielectric spectroscopy of melt-mixed polypropylene and pyrolytically stripped ...
Samir, Zineb; Paleo, Antonio J.; Aribou, Najoia; Nioua, Yassine; Silva, Jaime Oliveira da; Cerqueira, M. F.; Moreira, Joaquim AgostinhoIn 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 sl...