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S. Keck, O. Liske, C. Gorsche, B. Steyrer, S. Baudis, S. Knaus:
"Lignin - alternative renewable resource for 3D printing based on photopolymers";
Vortrag: 18. Österreichische Chemietage, Linz; 24.09.2019 - 27.09.2019; in: "18. Österreichische Chemietage", (2019), S. 26.

Application of photopolymers in lithography-based additive manufacturing technol-ogies (L-AMTs) is a powerful tool to manufacture complex parts. [1] Commercially avail¬able materials predominantly base on petrochemical products with a low sustainability. Lignin, the second most abundant bio-based polymer and cheap waste product of pulp and paper industry, is a promising candidate for the development of renewable photo-curable polymers.
In this work, wheat straw soda lignin was modified in a two-step procedure and charac-terized via qualitative and quantitative methods such as 31P-NMR, 1H-NMR-, ATIR-spectroscopy and photorheology [2] to evaluate its potential in 3D printing applications. Oxyalkylation of lignin with propylene oxide not only improves the solubility, decreases the viscosity and homogenizes the different functional hydroxyl groups but also increases the reactivity. Due to their radical inhibition capacity, the masking of phenolic OH groups is of particular importance. Further modification of propoxylated lignin with reactive compounds, e.g. (meth)acrylates or vinyl esters [3], converts the polyol to a photopolymerizable macromonomer. Acrylate-based, propoxylated lignin was successfully processed by L-AMTs and opens a new field of application for lignin in radical photopolymerization.

photopolymers, lithography-based additive manufacturing technologies, lignin, renewable photo-curable polymers, radical photopolymerization