Title: Characterization of Poss-Ultem Nanocomposites and Their FFF Printed-Part Properties

Authors: Charles M. Davis, Jordan M. Antonson, Paul G. H. Smith, Ben Kaas and John M. Misasi

DOI: 10.33599/nasampe/c.19.0829

Abstract: Fused filament fabrication (FFF) is a common form of additive manufacturing due to its low cost, ease of use, and broad utilization of materials. However, due to its layer-by-layer nature, FFF printed parts typically contain high void contents and have poor mechanical properties in the axis perpendicular to the layers (z-axis) compared to parts manufactured by traditional methods. This research investigated the melt plasticization effects of polyhedral oligomeric silsesquioxane (POSS) with ULTEM 1000 polyetherimide (PEI) for FFF printing filament. The purpose was to study the effects of POSS on printed-part infill density and void content. The POSS-PEI filaments were compounded and manufactured using a twin screw extruder (TSE) in concentrations of 1, 5, and 10 wt% POSS, and were subsequently printed into testing specimens. POSS dispersion was characterized in both filaments and printed parts using scanning electron microscopy (SEM). The effects of POSS on ULTEM filament flow properties were studied using melt flow index (MFI) and parallel plate rheology, while printed part in-fill was characterized using density. Finally, POSS-PEI flexural specimens were tested to understand the effects of POSS on mechanical properties. Interestingly, addition of low concentrations of POSS was found to improve flow properties, but printed part density and mechanical properties decreased. These findings are described in terms of POSS-ULTEM properties before and after printing.

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Conference: CAMX 2019

Publication Date: 2019/09/23

SKU: TP19-0829

Pages: 12

Price: $24.00