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Published on: January 11, 2019
POM/EVA Blends with Future Utility in Fused Deposition Modeling
Mateusz Galeja1, Klaudiusz Wypiór1, Jan Wachowicz1
1Department of Material Engineering, Central Mining Institute, Pl. Gwarków 1, 40-166 Katowice, Poland.
Adding ethylene-vinyl acetate (EVA) to polyoxymethylene (POM) enhances its ductility and toughness, improving 3D printing success by reducing warping and defects. This modification broadens the processing window for 3D printing applications.
Area of Science:
- Materials Science
- Polymer Science
- Additive Manufacturing
Background:
- Polyoxymethylene (POM) is a widely used thermoplastic polymer.
- Its application in rapid prototyping is hindered by poor dimensional stability and warping in 3D prints.
Purpose of the Study:
- To investigate the effects of incorporating ethylene-vinyl acetate (EVA) into POM.
- To evaluate the impact on processing, structure, properties, and volatile organic compound (VOC) emissions.
Main Methods:
- Melt flow index for processing.
- X-ray microcomputed tomography for structure.
- Tensile tests, surface resistance, contact angle, DSC, TGA for properties.
- Headspace analysis for VOC emissions.
Main Results:
- EVA addition decreased stiffness and strength but increased ductility and toughness by over 50% (at 7.5 wt.%).
- Improved linear flow rate and reduced internal defects were observed.
- Lowered melting temperature and slightly increased thermal stability broadened the processing window.
- Successful 3D printing trials with fewer defects were achieved.
Conclusions:
- EVA modification significantly enhances POM's toughness and processability for 3D printing.
- The improved properties and processing window suggest potential for wider adoption in rapid prototyping.
- Further development is warranted to fully leverage EVA-modified POM in additive manufacturing.
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