Multiple Reprocessing of Conductive PLA 3D-Printing Filament: Rheology, Morphology, Thermal and Electrochemical Properties Assessment

• Published in: Materials Vol. 16; no. 3; p. 1307
• Main Authors: Cieślik, Mateusz, Rodak, Agata, Susik, Agnieszka, Wójcik, Natalia, Szociński, Michał, Ryl, Jacek, Formela, Krzysztof
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 03-02-2023; MDPI
• Subjects: 3-D printers; 3D printing; 3D-printing filament; Analysis; Carbon black; Composite materials; conductive material; Electrochemical analysis; electrochemical properties; Electrode materials; Industrial development; Mechanical properties; Melting points; Morphology; multiple reprocessing; Percolation; PLA; Polymers; Real property; recycling; Reprocessing; Rheological properties; Rheology; Sensors; Spectrum analysis; Stability analysis; Thermal stability; Three dimensional printing; Valuation; Poland; Germany; 3D-printing filament; conductive material; recycling; PLA; multiple reprocessing; electrochemical properties
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma16031307

Additive manufacturing technologies are gaining more and more attention, resulting in the development or modification of 3D printing techniques and dedicated materials. On the other hand, economic and ecological aspects force the industry to develop material recycling strategies. In this work, the multiple reprocessing of a commercially available PLA conductive composite with carbon black filler, dedicated to 3D printing, was investigated. The effects of extrusion temperature (190 °C and 200 °C) and reprocessing steps (1-5 steps) on the rheology, morphology, thermal and electrochemical properties of the conductive PLA 3D-printing filament were evaluated. The results showed deterioration of the thermal stability and material strength, as well as the influence of reprocessing on the melting point, which increases after initial melting. The electronic conduction mechanism of the composite depends on the percolation paths and it is also affected by the multiple processing. The reversibility of the [Fe(CN)
]
redox process diminishes with a higher degradation level of the conductive PLA. Importantly, the material fluidity was too high after the multiple reprocessing, which should be considered and suitably corrected during CB-PLA application as a 3D-printed electrode material.