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All Biomass and UV Protective Composite Composed of Compatibilized Lignin and Poly (Lactic-acid)
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Journal Article
All Biomass and UV Protective Composite Composed of Compatibilized Lignin and Poly (Lactic-acid)
2017
Overview
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 μm), 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.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
