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TitleComparative analyses of the electrical properties and dispersion level of VGCNF and MWCNT: epoxy composites
Author(s)Cardoso, Paulo
Silva, J.
Paiva, M. C.
Hattum, F. W. J. van
Lanceros-Méndez, S.
electrical properties
epoxy resin
percolation threshold
Issue date2012
JournalJournal of Polymer Science Part B: Polymer Physics
CitationJOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS Volume: 50 Issue: 17 Pages: 1253-1261 DOI: 10.1002/polb.23110 Published: SEP 1 2012
Abstract(s)The electrical properties and dispersion of vapor-grown carbon nanofibers (VGCNF) and multi-walled carbon nanotubes (MWCNT) - epoxy resin composites are studied and compared. A blender was used to disperse the nanofillers within the matrix, producing samples with concentrations of 0.1, 0.5 and 1.0 wt.% for both nanofillers, besides the neat sample. The dispersion of the nanofillers was qualitatively analyzed using scanning electron microscopy (SEM), transmission optical microscopy (TOM) and greyscale analysis (GSA). The electrical conductivity and the dielectric constant were evaluated. The percolation threshold of MWCNT epoxy composites is lower than 0.1 wt.% while for VGCNF lies between 0.1 and 0.5 wt.%. The difference on the dispersion ability of the two nanofillers is due to their intrinsic characteristics. Celzard’s theory is suitable to calculate the percolation threshold bounds for the VGCNF composites but not for the MWCNT composites, indicating that intrinsic characteristics of the nanofillers beyond the aspect ratio are determinant for the MWCNT composites electrical conductivity.
AccessRestricted access (UMinho)
Appears in Collections:CDF - FCD - Artigos/Papers (with refereeing)
IPC - Artigos em revistas científicas internacionais com arbitragem

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