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Improving UV Curing in Lignin-Containing Photopolymers for Stereolithography by Chemical Reduction and Acetylation

preprint
submitted on 13.11.2019 and posted on 25.11.2019 by Jordan T. Sutton, Kalavathy Rajan, David P. Harper, Stephen Chmely
Despite recent successes incorporating lignin into photoactive resins, lignin photo-properties can be detrimental to its application in UV-curable photopolymers, especially to customized, engineered resins for use in stereolithography printing. We report on chemical modification techniques employed to reduce UV absorption in lignin and the resulting mechanical, thermal, and cure properties in these lignin-containing materials. Pine lignin was modified using acetylation and reduction reactions and incorporated into a printable resin formulation. Modified lignin displayed enhanced printing properties because UV absorption at the 3D printable range was reduced in all acylated lignin from 25% up to greater than 60%. Resins made with the modified lignin showed increased stiffness and strength with lower thermal stability. Investigating these techniques is an important step in developing lignin for use in UV-curing applications and furthers the effort to valorize lignin toward commercial use.

Funding

US DOT DTOS59-07-G-00050

USDA National Institute of Food and Agriculture Hatch Project 1012359

USDA National Institute of Food and Agriculture Federal Appropriations under Project PEN04671 Accession number 1017582

History

Email Address of Submitting Author

sc411@psu.edu

Institution

Pennsylvania State University

Country

USA

ORCID For Submitting Author

0000-0002-2637-9974

Declaration of Conflict of Interest

No conflict of interest

Version Notes

v01 pre-submission

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