Hong Seo-Hwa, Park Jin Hwan, Kim Oh Young, Hwang Seok-Ho
Materials Chemistry & Engineering Laboratory, School of Polymer System Engineering, Dankook University, Yongin, Gyeonggi-do 16890, Korea.
Polymers (Basel). 2021 Feb 23;13(4):667. doi: 10.3390/polym13040667.
Using a simple esterification reaction of a hydroxyl group with an anhydride group, pristine lignin was successfully converted to a new lignin (COOH-lignin) modified with a terminal carboxyl group. This chemical modification of pristine lignin was confirmed by the appearance of new absorption bands in the FT-IR spectrum. Then, the pristine lignin and COOH-lignin were successfully incorporated into a poly(lactic acid) (PLA) matrix by a typical melt-mixing process. When applied to the COOH-lignin, interfacial adhesion performance between the lignin filler and PLA matrix was better and stronger than pristine lignin. Based on these results for the COOH-lignin/PLA biocomposites, the cost of printing PLA 3D filaments can be reduced without changing their thermal and mechanical properties. Furthermore, the potential of lignin as a component in PLA biocomposites adequate for 3D printing was demonstrated.
通过羟基与酸酐基团的简单酯化反应，原始木质素成功转化为一种末端带有羧基的新型木质素（COOH-木质素）。FT-IR光谱中出现的新吸收带证实了原始木质素的这种化学改性。然后，通过典型的熔融共混工艺，原始木质素和COOH-木质素成功地掺入聚乳酸（PLA）基体中。当应用于COOH-木质素时，木质素填料与PLA基体之间的界面粘附性能比原始木质素更好、更强。基于COOH-木质素/PLA生物复合材料的这些结果，在不改变其热性能和机械性能的情况下，可以降低打印PLA 3D长丝的成本。此外，还证明了木质素作为适用于3D打印的PLA生物复合材料成分的潜力。
