Improving UV Curing in Organosolv Lignin-Containing Photopolymers for Stereolithography by Reduction and Acylation.

Autor: Sutton JT; Center for Renewable Carbon, The University of Tennessee Institute of Agriculture, Knoxville, TN 37996, USA.; Department of Materials Science and Engineering, The University of Tennessee Knoxville, Knoxville, TN 37996, USA., Rajan K; Center for Renewable Carbon, The University of Tennessee Institute of Agriculture, Knoxville, TN 37996, USA.; Department of Biosystems Engineering and Soil Science, The University of Tennessee Institute of Agriculture, Knoxville, TN 37996, USA., Harper DP; Center for Renewable Carbon, The University of Tennessee Institute of Agriculture, Knoxville, TN 37996, USA., Chmely SC; Department of Ag & Bio Engineering, Penn State University, University Park, PA 16802, USA.
Jazyk: angličtina
Zdroj: Polymers [Polymers (Basel)] 2021 Oct 10; Vol. 13 (20). Date of Electronic Publication: 2021 Oct 10.
DOI: 10.3390/polym13203473
Abstrakt: Despite recent successes in incorporating lignin into photoactive resins, lignin photo-properties can be detrimental to its application in UV-curable photopolymers, especially in specialized engineered resins for use in stereolithography printing. We report on chemical modification techniques employed to reduce UV absorption by lignin and the resulting mechanical, thermal, and cure properties of these modified lignin materials. Lignin was modified using reduction and acylation reactions and incorporated into a 3D printable resin formulation. UV-Vis absorption at the 3D printing range of 405 nm was reduced in all modified lignins compared to the unmodified sample by 25% to ≥ 60%. Resins made with the modified lignins showed an increase in stiffness and strength with lower thermal stability. Studying these techniques is an important step in developing lignin for use in UV-curing applications and further the effort to valorize lignin towards commercial use.
Databáze: MEDLINE
Externí odkaz: