Mechanical Recyclability of Polypropylene Composites Produced by Material Extrusion-Based Additive Manufacturing
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In: Polymers, Vol. 11.2019, No. 8, 1318, 07.08.2019.
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TY - JOUR
T1 - Mechanical Recyclability of Polypropylene Composites Produced by Material Extrusion-Based Additive Manufacturing
AU - Spörk, Martin
AU - Arbeiter, Florian
AU - Raguz, Ivan
AU - Holzer, Clemens
AU - Gonzales-Gutierrez, Joamin
N1 - Publisher Copyright: © 2019 by the author.
PY - 2019/8/7
Y1 - 2019/8/7
N2 - Due to a lack of long-term experience with burgeoning material extrusion-based additive manufacturing technology, also known as fused filament fabrication (FFF), considerable amounts of expensive material will continue to be wasted until a defect-free 3D-printed component can be finalized. In order to lead this advanced manufacturing technique toward cleaner production and to save costs, this study addresses the ability to remanufacture a wide range of commercially available filaments. Most of them either tend to degrade by chain scission or crosslinking. Only polypropylene (PP)-based filaments appear to be particularly thermally stable and therefore suitable for multiple remanufacturing sequences. As the extrusion step exerts the largest influence on the material in terms of temperature and shear load, this study focused on the morphological, rheological, thermal, processing, tensile, and impact properties of a promising PP composite in the course of multiple consecutive extrusions as well as the impact of additional heat stabilizers. Even after 15 consecutive filament extrusions, the stabilized additively manufactured PP composite revealed an unaltered morphology and therefore the same tensile and impact strength as the initial material. As the viscosity of the material of the 15th extrusion was nearly identical to that of the 1st extrusion sequence, the processability both in terms of extrusion and FFF was outstanding, despite the tremendous amount of shear and thermal stress that was undergone. The present work provides key insights into one possible step toward more sustainable production through FFF.
AB - Due to a lack of long-term experience with burgeoning material extrusion-based additive manufacturing technology, also known as fused filament fabrication (FFF), considerable amounts of expensive material will continue to be wasted until a defect-free 3D-printed component can be finalized. In order to lead this advanced manufacturing technique toward cleaner production and to save costs, this study addresses the ability to remanufacture a wide range of commercially available filaments. Most of them either tend to degrade by chain scission or crosslinking. Only polypropylene (PP)-based filaments appear to be particularly thermally stable and therefore suitable for multiple remanufacturing sequences. As the extrusion step exerts the largest influence on the material in terms of temperature and shear load, this study focused on the morphological, rheological, thermal, processing, tensile, and impact properties of a promising PP composite in the course of multiple consecutive extrusions as well as the impact of additional heat stabilizers. Even after 15 consecutive filament extrusions, the stabilized additively manufactured PP composite revealed an unaltered morphology and therefore the same tensile and impact strength as the initial material. As the viscosity of the material of the 15th extrusion was nearly identical to that of the 1st extrusion sequence, the processability both in terms of extrusion and FFF was outstanding, despite the tremendous amount of shear and thermal stress that was undergone. The present work provides key insights into one possible step toward more sustainable production through FFF.
KW - Fused Filament Fabrication
KW - Recycling
KW - Polypropylene
KW - mineral particles
UR - http://www.scopus.com/inward/record.url?scp=85071151401&partnerID=8YFLogxK
U2 - 10.3390/polym11081318
DO - 10.3390/polym11081318
M3 - Article
VL - 11.2019
JO - Polymers
JF - Polymers
SN - 2073-4360
IS - 8
M1 - 1318
ER -