Filled polymer foams are widely utilized in the aerospace and defense industries for applications including structural support, vibration dampening, and shockwave modulation. Common periodic foams include additively manufactured (AM) silicones reinforced with silica fillers. The two most commonly printed cellular silicone structures, simple cubic (SC) and face-centered tetragonal (FCT) display distinctly different static and dynamic mechanical responses dependent upon structure. In this work, the relationship between filler size and composition with mechanical response is investigated using polydimethylsiloxane-based silicones filled with aluminum oxide, graphite, or titanium dioxide. SC and FCT structures of porous, periodic silicone pads were printed using new DIW resin formulations containing up to 25 wt.% of functional filler (TiO2, Al2O3, or graphite). All AM pads were characterized using chemical, thermal, and mechanical techniques. Dynamic compression experiments coupled with time-resolved X-ray phase contrast imaging were performed to obtain insights into the role of filler interactions in the in situ evolution of shockwave coupling in these functional, periodic porous polymers.

Impact of filler composition on mechanical response of 3-D printed silicone-based composite elastomers

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.