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.
| Original language | English |
|---|---|
| Article number | 115853 |
| Journal | Composite Structures |
| Volume | 296 |
| DOIs | |
| Publication status | Published - 15 Sept 2022 |
Bibliographical note
Publisher Copyright:© 2022 Elsevier Ltd
Funding
The authors would like to acknolwledge Boeing Company, United States for their support. The authors are grateful to Dyze Design for providing technical support. The authors would also like to thank Suat Ebil for contributing to extrusion process and Yunus Emre Bozkurt for conducting rheological characterizations.
Keywords
- Additive manufacturing
- Carbon nanotubes
- Mechanical properties and standards
- Multifunctionality
- PEI nanocomposite
