Towards optimized carbon nanotubes (CNTs) reinforced polyetherimide (PEI) 3D printed structures: A comparative study on testing standards


Yıldız A. , Emanetoglu U., Yenigun E. O. , Cebeci H.

COMPOSITE STRUCTURES, vol.296, 2022 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 296
  • Publication Date: 2022
  • Doi Number: 10.1016/j.compstruct.2022.115853
  • Title of Journal : COMPOSITE STRUCTURES
  • Keywords: Carbon nanotubes, PEI nanocomposite, Additive manufacturing, Mechanical properties and standards, Multifunctionality, MECHANICAL CHARACTERIZATION, POLYMER NANOCOMPOSITES, BEHAVIOR, CONDUCTIVITY, PERFORMANCE, PERCOLATION, STRENGTH, COMPOSITES, PARTS, STATE

Abstract

Tailoring the properties of high-performance polymers through reinforcing will bring multifunctionality and expand their use in additive manufacturing (AM). However, machine and material-based challenges exist, eventually resulting in low-quality end products. When expensive polymers are considered, it is still challenging to tailor their properties and print them for high-quality multifunctional structures. Here, polymer composites of polyetherimide (PEI) and carbon nanotubes (CNTs) with varying CNT weight fractions are produced in filament form by melt-processing. Neat PEI, 1 wt% and 3 wt% CNTs/PEI are additively manufactured in two different raster orientations (Rectilinear and Concentric), and two most proposed testing geometries, ASTM D638 and D3039. Through effective melt-processing, CNTs-reinforced PEI filaments were achieved, printing parameters and testing protocols were discussed. As a result, ASTM D3039 showed superior coherence with filaments' mechanical properties. Moreover, based on failure modes, ASTM D3039 provided better compatibility to AM, owing to its simple rectangular form yielding well-adhered layers.