Abstract
The 3D printable PLA-graphene composite feedstock filaments can be used to print components that exhibit multi-functionality. The present work analyzes different processing routes and proposes a standard procedure for making PLA-graphene composite feedstock filaments. We used two routes to process graphene-based fillers: the modified Hummers process (HG) and electrochemical exfoliation (EG). After that, PLA-graphene composites with variable filler loadings were processed by mixing different solvents, DMF and CHCl3. Then, printable feedstock filaments were processed from these composites by using a desktop single-screw extruder. It was observed that solvent type influences mechanical properties, and filler type influences electrical properties. The DMF-based composites showed high ductility compared to CHCl3-based composites. The EG-based filaments showed higher electrical conductivity than HG-based filaments. The printability of processed filaments was investigated by 3D printing test samples using fused filament fabrication (FFF). It was observed that CHCl3 improved printability at low filler loading, and DMF improved printability at high filler loading. The 3D-printed samples showed higher mechanical strength at 0.3 wt% for all filament combinations. The electrical properties of 3D printed samples are highest for EG. It is suggested to use 5 wt% of EG with DMF for enhanced electrical properties of printed samples. Also, 0.3 wt% HG with CHCl3 is suggested for enhanced mechanical properties of printed samples.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
