Journal
MACROMOLECULAR MATERIALS AND ENGINEERING
Volume 302, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.201700143
Keywords
additive manufacturing; fillers; microstructure; poly(propylene) (PP); shrinkage and warpage
Funding
- Austrian Research Promotion Agency (FFG) as part of the NextGen3D project (Next Generation 3D) [848624]
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A major challenge in extrusion-based additive manufacturing is the lack of commercially available materials compared to those in well-established processes like injection molding or extrusion. This study aims at expanding the material database by evaluating the feasibility of polypropylene, which is one of the most common and technologically relevant semicrystalline polymers. Expanded-perlite-filled polypropylene and ternary blends with amorphous polyolefins are evaluated to establish an understanding of their processability and their printability. A detailed study on the shrinkage behavior, as well as on the thermal, mechanical, morphological, and warpage properties is performed. It is found that smaller sized fillers result in a tremendous warpage and shrinkage reduction and concurrently improved mechanical properties than compounds filled with bigger sized fillers. Based on the optimal properties profile, a ternary blend that can overcome the shrinkage and warpage of printed parts is suggested.
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