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Materials 2018, 11(7), 1191; https://doi.org/10.3390/ma11071191

Polylactide (PLA) Filaments a Biobased Solution for Additive Manufacturing: Correlating Rheology and Thermomechanical Properties with Printing Quality

1
Dipartimento DICAR (Department of Civil Engineering and Architecture), Università di Catania, Viale Andrea Doria 6, 95125 Catania, Italy
2
UdR-Catania Consorzio INSTM, Viale Andrea Doria 6, 95125 Catania, Italy
3
Dipartimento di Ingegneria Chimica, dei Materiali e Della Produzione Industriale, Università degli Studi di Napoli Federico II, Piazzale Tecchio 80, 80125 Napoli, Italy
4
UdR-Napoli Consorzio INSTM, Piazzale Tecchio 80, 80125 Napoli, Italy
*
Author to whom correspondence should be addressed.
Received: 28 May 2018 / Revised: 6 July 2018 / Accepted: 10 July 2018 / Published: 11 July 2018
(This article belongs to the Special Issue Green Composites: Preparation, Properties, and Applications)
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Abstract

Three commercial filaments for Fused Deposition Modeling (FDM) were selected to study the influence of polymer formulation on the printing quality and mechanical properties of FDM specimens. The three filaments were all based on polylactic acid (PLA) as the matrix, and they are sold as PLA filaments. The printing quality was tested by printing one complex shape with overhang features. The marked shear thinning behavior for two filaments was observed by rheology. The filaments were also studied by scanning electron microscopy and thermogravimetric analysis (TGA) to unveil their composition. The filaments with the best printing quality showed the presence of mineral fillers, which explained the melt behavior observed by rheology. The tensile testing confirmed that the filled PLA was the best-performing filament both in terms of printing quality and thermomechanical performance, with a p-value = 0.106 for the tensile modulus, and a p-value = 0.615 for the ultimate tensile strength. View Full-Text
Keywords: additive manufacturing; fused deposition modeling; rheology; mechanical properties; PLA; 3D printing; thermal properties additive manufacturing; fused deposition modeling; rheology; mechanical properties; PLA; 3D printing; thermal properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Cicala, G.; Giordano, D.; Tosto, C.; Filippone, G.; Recca, A.; Blanco, I. Polylactide (PLA) Filaments a Biobased Solution for Additive Manufacturing: Correlating Rheology and Thermomechanical Properties with Printing Quality. Materials 2018, 11, 1191.

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