Extrusion additive manufacturing is a powerful processing technique to fabricate customized objects with designed features, complex geometry, and high resolution. One of the biggest challenges of additive manufacturing is the mechanical anisotropy of the printed object, where the strength in the build direction is usually much lower compared to that along the extrusion direction, demonstrating weak interlayer adhesion. This project provides solution to extrusion 3-D printing by developing novel segmented polyureas that contain quadruple hydrogen boning in the hard segment. Hydrogen bonding offered mechanical integrity, enabling high Young’s modulus (~100 MPa) and excellent stretchability (~800%) at the same time. Moreover, the material exhibited shear thinning property and underwent rapid solidification to hold the shape upon extrusion, which contributed to high printing resolution. Most importantly, tensile testing on printed polymer revealed similar mechanical strength between the extruded direction and interlayer, demonstrating surprising mechanical isotropy of the prints.

High strength, high flexibility quadruple hydrogen bonding containing polyureas for 3D extrusion printing

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.