Kim, Youngjun Suhr, Jonghwan Seo, Hee-Won Sun, Hanna Kim, Sanghoon Park, In-Kyung Kim, Soo-Hyun Lee, Youngkwan Kim, Kwang-Jin Nam, Jae-Do 2024-01-20T02:03:00Z 2024-01-20T02:03:00Z 2021-09-01 2017-03 2045-2322 https://pubs.kist.re.kr/handle/201004/123031 Utilization of carbon-neutral biomass became increasingly important due to a desperate need for carbon reduction in the issue of global warming in light of replacing petroleum-based materials. We used lignin, which was an abundant, low cost, and non-food based biomass, for the development of all biomass-based films and composites through reactive compatibilization with poly (lactic-acid) (PLA). Using a facile and practical route, the hydrophilic hydroxyl groups of lignin were acetylated to impose the compatibility with PLA. The solubility parameter of the pristine lignin at 26.3 (J/cm(3))(0.5) was altered to 20.9 (J/cm(3))(0.5) by acetylation allowing the good compatibility with PLA at 20.2 (J/cm(3))(0.5). The improved compatibility of lignin and PLA provided substantially decreased lignin domain size in composites (12.7 mu m), which subsequently gave transparent and UV-protection films (visual transmittance at 76% and UV protection factor over 40). The tensile strength and elongation of the developed composite films were increased by 22% and 76%, respectively, and the biobased carbon content was confirmed as 96 +/- 3%. The developed PLA/lignin composites provided 100% all-biomass contents and balanced optical and mechanical properties that could broaden its eco-friendly applications in various industries. English Nature Publishing Group All Biomass and UV Protective Composite Composed of Compatibilized Lignin and Poly (Lactic-acid) Article 10.1038/srep43596 1 Scientific Reports, v.7 Scientific Reports 7 Y scie scopus 000395686700001 2-s2.0-85042877758 Multidisciplinary Sciences Science & Technology - Other Topics Article BIOBASED CONTENTS CELLULOSE CRYSTALLIZATION ACETYLATION NUCLEATION BEHAVIOR CARBON LENGTH RATIO