(539g) Emergent Mechanical Properties in Highly Filled Polymer Composites Fabricated Using Vat Photopolymerization

Vat photopolymerization-based additive manufacturing (AM) approaches enables fabrication of thermosetting composite structures, including those with a substantial loading of the reinforcement phase. We have previously demonstrated fabrication of composites containing up to 70 vol.% glass microspheres through combining a coarse particle fraction with a fine one, and have shown that the mechanical properties of highly filled composites can be tailored through modification of the glass surface chemistry. In this work, we investigate additively manufactured composites containing coarse and fine glass microspheres that are functionalized using silane coupling agents to explore how and why different functionalization of the fine and coarse fractions leads to vastly different mechanics. These results can inform future work in tailoring mechanics of highly filled additively manufactured composites.