Effects of Kraft lignin and corn cob agro-residue on the properties of injected-moulded biocomposites - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement
Journal Articles Industrial Crops and Products Year : 2022

Effects of Kraft lignin and corn cob agro-residue on the properties of injected-moulded biocomposites

Abstract

Lignocellulosic by-products are frequently disposed by means of combustion. This study investigates an alternative route for corn cob and Kraft lignin resources in order to support circular economy. The respective plant-based fibres and filler were compounded for the first time together with a poly(lactic acid) (PLA) matrix. Consecutively, seven different biocomposites were processed by injection-moulding and further characterized. The biocomposite containing a mixture of Kraft lignin and corn cob (12 wt% in total) exhibited the highest flexural strength (84 MPa). A proper wetting of PLA onto the corn cob particles demonstrated a good compatibility at matrix/fibre interface. PLA molecular structure changed in presence of 20 wt% lignin filler, with effect on the glass transition temperature and on the composite mechanical strength. The fibres moderately influenced composites surface tension, while Kraft lignin contributed to a slight increase of surface hydrophobicity. Surface energy (σsTotal) of composites have been estimated at 27.6, 28.7 and 27.8 mN/m for PLA/KL-20, PLA/CC-10 and PLA/KL-15/CC-5 respectively. While the polar component (σsPolar) have been estimated at 17.8, 20.0 and 18.7 mN/m for PLA/KL-20, PLA/CC-10 and PLA/KL-15/CC-5 respectively. Unlike the PLA/corn cob composite, those containing Kraft lignin were entirely biodegraded within 2 months in industrial composting conditions study. The materials could be utilized for end-use products thanks to their good mechanical and thermal properties. By adding wood-lignin and corn by-products, materials cost and carbon footprint shall decrease in comparison to pure PLA, while being a biodegradable and sustainable replacement of polyolefins.
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hal-03523264 , version 1 (08-01-2024)

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Hélène de Baynast, Amélie Tribot, Benjamin Niez, Fabrice Audonnet, Eric Badel, et al.. Effects of Kraft lignin and corn cob agro-residue on the properties of injected-moulded biocomposites. Industrial Crops and Products, 2022, 177, pp.114421. ⟨10.1016/j.indcrop.2021.114421⟩. ⟨hal-03523264⟩
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