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One-step processing of plasticized starch/cellulose nanofibrils nanocomposites via twin-screw extrusion of starch and cellulose fibers

Abstract : Nanocomposites based on thermoplasticized starch filled with cellulose nanofibrils (CNFs) were produced in a single step by twin-screw extrusion of corn starch granules, glycerol as a plasticizer, and oxidized cellulose fibers. The objective was to demonstrate the possibility to produce CNFs in situ during the processing of the nanocomposite when a hydrophilic polymer matrix was used. For comparison purpose, nanocomposites were also prepared by extrusion of a previously prepared CNF suspension, corn starch granules and glycerol. The nanocomposites were characterized in terms of mechanical properties, morphology, crystallinity, and transparency. The nanocomposites prepared via in situ fibrillation displayed a higher strength than those produced by incorporating readily prepared CNFs. In addition, the transparency degree up to a 15 wt% CNF content was similar for the two processing routes, confirming the effective breakdown of pretreated cellulose fibers into CNFs during the extrusion process.
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https://hal.archives-ouvertes.fr/hal-02427806
Contributor : Jean-Luc Putaux <>
Submitted on : Friday, May 28, 2021 - 11:36:34 PM
Last modification on : Wednesday, September 22, 2021 - 9:14:05 AM
Long-term archiving on: : Sunday, August 29, 2021 - 7:55:11 PM

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Yesmine Fourati, Albert Magnin, Jean-Luc Putaux, Sami Boufi. One-step processing of plasticized starch/cellulose nanofibrils nanocomposites via twin-screw extrusion of starch and cellulose fibers. Carbohydrate Polymers, Elsevier, 2020, 229, pp.115554. ⟨10.1016/j.carbpol.2019.115554⟩. ⟨hal-02427806⟩

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