About this Abstract |
Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Symposium
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2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Presentation Title |
Multimaterial and Isotopically Labeled Specimen Fabrication via Material Extrusion Additive Manufacturing for Interlayer Diffusion Analysis |
Author(s) |
Haley Wendelin Jones, E. Cade Willis, Tyler Guin, Camden A. Chatham |
On-Site Speaker (Planned) |
Haley Wendelin Jones |
Abstract Scope |
The end-use performance of parts fabricated using material extrusion (MEX) additive manufacturing (AM) technologies is highly dependent on the degree of fusion between extruded layers. This interlayer fusion, driven by polymer diffusion and the formation of molecular entanglements across layer interfaces, governs the mechanical integrity of printed parts. While rheological models have been employed to estimate molecular diffusion across layer interfaces under specific printing conditions, direct experimental measurement of interlayer diffusion remains challenging. In this work, specimens fabricated by fused filament fabrication (FFF) AM were designed to enable direct probing of interlayer diffusion using Raman spectroscopy and neutron scattering techniques. Specifically, multimaterial specimens composed of alternating polymer layers (e.g., polypropylene/poly(ethylene terephthalate) glycol-modified) were fabricated to exploit the chemical contrast observable through Raman spectroscopy. Additionally, specimens consisting of alternating protonated and deuterated layers of high-density polyethylene were fabricated to enable contrast between proton-rich and deuterium-rich domains for neutron scattering analysis. |
Proceedings Inclusion? |
Planned: Post-meeting proceedings |