Sutton Jordan T, Rajan Kalavathy, Harper David P, Chmely Stephen C
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.
Polymers (Basel). 2021 Oct 10;13(20):3473. doi: 10.3390/polym13203473.
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.
尽管最近在将木质素掺入光活性树脂方面取得了成功，但木质素的光性能可能不利于其在紫外光固化光聚合物中的应用，特别是在用于立体光刻印刷的特殊工程树脂中。我们报告了用于减少木质素紫外线吸收的化学改性技术，以及这些改性木质素材料由此产生的机械、热和固化性能。通过还原和酰化反应对木质素进行改性，并将其掺入3D可打印树脂配方中。与未改性样品相比，所有改性木质素在405nm的3D打印范围内的紫外可见吸收降低了25%至≥60%。用改性木质素制成的树脂表现出刚度和强度增加，热稳定性降低。研究这些技术是开发用于紫外光固化应用的木质素以及进一步推动木质素商业化利用的重要一步。
