3D-print: correlating Rheology and Thermomechanical Properties with Printing Quality

Gianluca Cicala, Davide Giordano, Claudio Tosto, Giovanni Filippone, Antonino Recca, Ignazio Blanco

Overview

Three different commercial PLA filaments were selected and printed with a commercial FDM machine, selecting a challenging 3D geometry with overhang printing. The filaments were thoroughly characterized by rheological, microscopic, and thermal techniques to explain the differences in the printing and tensile properties observed.

Summary

The printing parameters must be settled taking into account the polymer's viscosity, considering the printer is operating in the melt. Thus, to ensure the best bond quality between the adjacent filaments rheological and calorimetric investigation of the materials used in the printing are of crucial importance.

Author Comments

Prof. Ignazio Blanco, PhD
Prof. Ignazio Blanco, PhD
University of Catania
Full Professor
Thermal Analysis
Catania, Sicily | Italy
The findings of this paper support the conclusion that unmodified polymer filaments are not the best choice for FDM. The research should investigate further the optimization of the formulations to exploit the best performances of plastics used for FDM.Prof. Ignazio Blanco, PhD

Resources

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

Authors:
Prof. Ignazio Blanco, PhD
Prof. Ignazio Blanco, PhD
University of Catania
Full Professor
Thermal Analysis
Catania, Sicily | Italy
Gianluca Cicala
Gianluca Cicala
University of Catania
Prof
Materials Science and Technology
Catania, Sicily | Italy
Claudio Tosto
Claudio Tosto
Università di Catania
PhD student
Mechanical Engineer
Catania, Sicily | Italy

Materials (Basel) 2018 Jul 11;11(7). Epub 2018 Jul 11.

Dipartimento DICAR (Department of Civil Engineering and Architecture), Università di Catania, Viale Andrea Doria 6, 95125 Catania, Italy.

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 -value = 0.106 for the tensile modulus, and a -value = 0.615 for the ultimate tensile strength.

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Source
http://dx.doi.org/10.3390/ma11071191DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6073186PMC
July 2018
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1 Citation
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