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Nanostructured cellulose-xyloglucan blends via ionic liquid/water processing

Abstract : In this work, the properties of cellulose (CE)/xyloglucan (XG) biopolymer blends are investigated, taking inspiration from the outstanding mechanical properties of plant cell walls. CE and XG were first co-solubilized in an ionic liquid, 1-ethy1-3-methylimidazolium acetate, in order to blend these biopolymers with a varying CE:XG ratio. The biopolymers were then regenerated together using water to produce solid blends in the form of films. Water-soluble XG persisted in the films following regeneration in water, indicating an attractive interaction between the CE and XG. The final CE:XG ratio of the blends was close to the initial value in solutions, further suggesting that intimate mixing takes place between CE and XG. The resulting CE/XG films were found to be free of ionic liquid, transparent and with no evidence of phase separation at the micron scale. The mechanical properties of the blend with a CE:XG ratio close to one revealed a synergistic effect for which a maximum in the elongation and stress at break was observed in combination with a high elastic modulus. Atomic force microscopy indicates a co-continuous nanostructure for this composition. It is proposed that the non-monotonous variation of the mechanical performance of the films with XG content is due to this observed nanostructuration. (C) 2017 Elsevier Ltd. All rights reserved.
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Submitted on : Tuesday, September 7, 2021 - 10:38:32 AM
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Amine Bendaoud, Rene Kehrbusch, Anton Baranov, Benoît Duchemin, Jean Eudes Maigret, et al.. Nanostructured cellulose-xyloglucan blends via ionic liquid/water processing. Carbohydrate Polymers, Elsevier, 2017, 168, pp.163-172. ⟨10.1016/j.carbpol.2017.03.080⟩. ⟨hal-03336355⟩



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