Electrically conductive high-performance thermoplastic filaments for fused filament fabrication

Kaynan O., Yıldız A. , Bozkurt Y. E. , Yenigun E. O. , Cebeci H.

COMPOSITE STRUCTURES, vol.237, 2020 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 237
  • Publication Date: 2020
  • Doi Number: 10.1016/j.compstruct.2020.111930
  • Title of Journal : COMPOSITE STRUCTURES
  • Keywords: Polymer nanocomposite, Polyetherimide, Carbon nanotubes, Fused filament fabrication, NANOCOMPOSITES, PERCOLATION, DISPERSION


Conducive polyetherimide (PEI)-based filaments can fill the gap between the design and manufacturing of functional and structural components through additive manufacturing. This study systematically describes the fabrication of carbon nanotube (CNTs)-reinforced PEI filaments, complemented by a custom-built extrusion process facilitating low weight fraction of nanomaterials. Neat PEI and CNTs/PEI filaments at different CNTs fractions ranging from 0.1 to 7 wt% were fabricated. Supported by morphology analysis, the rheological percolation was found to be higher (0.25 wt% CNTs/PEI) than electrical percolation (0.1 wt% CNTs/PEI) since the system reached an electrical percolation within the formation of a continuous conducive path at lower CNTs loadings. With the 7 wt% CNTs loading, the highest electrical conductivity of CNTs/PEI filaments was reported as 2.57 x 10(-1) S/cm. A 55% enhancement in tensile modulus was achieved when 5 wt% CNTs were introduced, but in a trade-off in elongation at break ca. 65%.