Lignin-based 3D printing material

We report the utilization of a melt-stable lignin waste-stream from biorefineries as a renewable feedstock to synthesize a renewable matrix having excellent 3D-printability. While the initial low melt viscosity of the dispersed lignin phase induces local thermo-rheological relaxation facilitating the material’s melt flow, thermal crosslinking in components as well as at the interface decreases the molecular mobility. Consequently, interfacial diffusion and the resulting adhesion between deposited layers is decreased. Our compositions not only exhibit significantly enhanced material performance but also good processability. A highly interfused printed structure with 100% improved inter-layer adhesion strength was demonstrated. This research offers a route toward utilizing lignin for replacement of petroleum-based thermoplastics used in additive manufacturing and methods to enhance printability of the materials with exceptional mechanical performance.

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