Emergent mechanical properties in highly filled additively manufactured polymer composites.

In this work, we investigate additively manufactured composites with populations of 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. Combining strong interfaces on fine particles with weak interfaces on coarse particles leads to enhancements in elongation to break and toughness, whereas combining two types of strong interfaces leads to enhancement in elongation to break and reduction or maintenance of other measured tensile properties. These results can inform future work in tailoring mechanics of highly filled additively manufactured composites. [ABSTRACT FROM AUTHOR]