1. 3D printing with high content of lignin enabled by introducing polyurethane.
- Author
-
Zhou, Xinyuan, Ren, Zechun, Sun, Hao, Bi, Hongjie, Gu, Tongfei, and Xu, Min
- Subjects
- *
THREE-dimensional printing , *POLYURETHANES , *LIGNINS , *RHEOLOGY , *LIGNIN structure , *WOOD , *TENSILE strength , *ENGINEERED wood - Abstract
The efficient utilization of lignin in 3D printing had attracted increasing attention using this abundant and eco-friendly material. However, the large-scale utilization of lignin in 3D printing remains a great challenge due to its inherent brittleness and non-thermoplasticity. In this study, thermoplastic polyurethane (TPU) was introduced to regulate the rheological properties of lignin for 3D printing. The Lignin/TPU composite of 3D printing exhibited a smooth surface, non-plastic, warm wood touch, and natural color at 50 wt% lignin loading. To further improve the mechanical properties of the composite, carbon fiber (CF) was added to the Lignin/TPU composite. The resulting CF/Lignin/TPU composites possessed 1.7 times higher tensile strength and 2.4 times higher elongation at break compared to Lignin/TPU composite. Meanwhile, the smooth surface of filament and dense interlayer bonds of printed specimens are also achieved. This work provides new insights to realize the high-value utilization of lignin and expands the practical application of lignin in 3D printing. [Display omitted] • TPU imparts lignin flexibility and thermoplastic properties. • Up to 50 wt% lignin composites available for 3D printing • The addition of carbon fiber enhances the mechanical properties of the composite. • Excellent interlayer bonding properties of 3D printed specimens after CF addition [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF