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

•Nanocomposite based on thermoplasticized starch and CNFs were produced by twin screw extrusion.•Comparative studies of the mechanical, morphological, and optical properties have been performed.•The successful disintegration of cellulose fibers into nanosized fibrils was confirmed by SEM and TEM. Na...

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Bibliographic Details
Published in:Carbohydrate polymers 2020-02, Vol.229, p.115554-115554, Article 115554
Main Authors: Fourati, Yesmine, Magnin, Albert, Putaux, Jean-Luc, Boufi, Sami
Format: Article
Language:English
Subjects:
Cellulose nanofibrils
Chemical Sciences
Extrusion
Material chemistry
Nanocomposites
Polymers
Thermoplastic starch
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Summary:•Nanocomposite based on thermoplasticized starch and CNFs were produced by twin screw extrusion.•Comparative studies of the mechanical, morphological, and optical properties have been performed.•The successful disintegration of cellulose fibers into nanosized fibrils was confirmed by SEM and TEM. 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.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2019.115554