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Polymers 2018, 10(8), 925; https://doi.org/10.3390/polym10080925

Electrically Conductive Polyetheretherketone Nanocomposite Filaments: From Production to Fused Deposition Modeling

1
Pólo de Inovação em Engenharia de Polímeros, University of Minho, 4500-058 Guimarães, Portugal
2
Leibniz Institute of Polymer Research Dresden (IPF), Hohe Str. 6, 01069 Dresden, Germany
3
European Space Research and Technology Centre, Keplerlaan 1, NL-2200 AG Noordwijk, The Netherlands
4
CMEMS-UMinho, University of Minho, 4500-058 Guimarães, Portugal
5
Institute for Polymers and Composites/i3N, University of Minho, 4800-058 Guimarães, Portugal
*
Authors to whom correspondence should be addressed.
Received: 4 July 2018 / Revised: 26 July 2018 / Accepted: 15 August 2018 / Published: 18 August 2018
(This article belongs to the Special Issue Polymers: Design, Function and Application)
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Abstract

The present work reports the production and characterization of polyetheretherketone (PEEK) nanocomposite filaments incorporating carbon nanotubes (CNT) and graphite nanoplates (GnP), electrically conductive and suitable for fused deposition modeling (FDM) processing. The nanocomposites were manufactured by melt mixing and those presenting electrical conductivity near 10 S/m were selected for the production of filaments for FDM. The extruded filaments were characterized for mechanical and thermal conductivity, polymer crystallinity, thermal relaxation, nanoparticle dispersion, thermoelectric effect, and coefficient of friction. They presented electrical conductivity in the range of 1.5 to 13.1 S/m, as well as good mechanical performance and higher thermal conductivity compared to PEEK. The addition of GnP improved the composites’ melt processability, maintained the electrical conductivity at target level, and reduced the coefficient of friction by up to 60%. Finally, three-dimensional (3D) printed test specimens were produced, showing a Young’s modulus and ultimate tensile strength comparable to those of the filaments, but a lower strain at break and electrical conductivity. This was attributed to the presence of large voids in the part, revealing the need for 3D printing parameter optimization. Finally, filament production was up-scaled to kilogram scale maintaining the properties of the research-scale filaments. View Full-Text
Keywords: PEEK; carbon nanotubes; graphite nanoplatelets; nanocomposites; filaments; fused deposition modeling (FDM) PEEK; carbon nanotubes; graphite nanoplatelets; nanocomposites; filaments; fused deposition modeling (FDM)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Gonçalves, J.; Lima, P.; Krause, B.; Pötschke, P.; Lafont, U.; Gomes, J.R.; Abreu, C.S.; Paiva, M.C.; Covas, J.A. Electrically Conductive Polyetheretherketone Nanocomposite Filaments: From Production to Fused Deposition Modeling. Polymers 2018, 10, 925.

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