Communication Dans Un Congrès Année : 2025

Effect of Polyols Absorption onto Cellulose Nanocrystals (CNC) on Melt and Mechanical Strengthening Through Reactive Extruded Vitrimerization.

Hu Qiao
Abderrahim Maazouz

Résumé

In this research, PLA based closed loop upcycling ‘foam to foam’ concept was proposed. An innovative and upcycling cellulose-reinforced PLA vitrimeric composites were prepared through a two-step reactive processing, in which CNC was ingeniously coated by polyols glycerol as the vitrimer composition by the freeze-drying method with water as the solvent and glycerol-coating. Well-dispersed CNC obtained by freeze-drying and glycerol coating was observed as good dispersion as evidenced as 200 nm in mean length as a reference of CNC powder in several micrometers. Subsequently, well-dispersed CNC remarkably reinforced melt strength, mechanical stiffness and thermal resistance on basis of neat vitrimer as evidenced by a pronounced strain hardening behavior, an around 20% increase in storage modulus and 3.7 ºC of increase in Vicat softening temperature. Consequently, CNC reinforced vitrimeric system achieved best foamability with 25-fold foam expansion with the assistance of effect of CNC on foaming nucleating. Most importantly, these foamed materials are recyclable, reprocessed. This ‘foam to foam’ concept.

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Dates et versions

hal-05088793 , version 1 (28-05-2025)

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  • HAL Id : hal-05088793 , version 1

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Hu Qiao, Abderrahim Maazouz, Khalid Lamnawar. Effect of Polyols Absorption onto Cellulose Nanocrystals (CNC) on Melt and Mechanical Strengthening Through Reactive Extruded Vitrimerization.. Annual European Rheological Conference 2025, Khalid Lamnawar, Apr 2025, Villeurbanne, France. ⟨hal-05088793⟩
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