Development and characterization of chitosan bionanocomposites containing oxidized cellulose nanocrystals

ABSTRACT In this research, cellulose nanocrystals (CNs) were extracted from corn cobs by 2,2,6,6,‐tetramethylpiperidine‐1‐oxyl radical‐mediated oxidation combined with ultrasonic treatment for the first time. These CNs were then used as a mechanical reinforcement agent and barrier in chitosan‐based...

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Bibliographic Details
Published in:Journal of applied polymer science 2016-02, Vol.133 (7), p.np-n/a
Main Authors: Souza, Vanderlei C., Niehues, Eduardo, Quadri, Mara G. N.
Format: Article
Language:English
Subjects:
Adhesion
biopolymers and renewable polymers
blends
Cellulose
cellulose and other wood products
Chitosan
Hydrophobicity
Materials science
mechanical properties
Nanocrystals
nanoparticles
nanowires and nanocrystals
Permeability
Polyethylenes
Polymers
Reinforcement
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Summary:ABSTRACT In this research, cellulose nanocrystals (CNs) were extracted from corn cobs by 2,2,6,6,‐tetramethylpiperidine‐1‐oxyl radical‐mediated oxidation combined with ultrasonic treatment for the first time. These CNs were then used as a mechanical reinforcement agent and barrier in chitosan‐based bionanocomposite films. Birefringence analyses under crossed polarizers indicated the presence of isolated nanocrystals in suspension, which was later confirmed by TEM analysis. The crystallinity index obtained from X‐ray diffraction was 92.4%. The incorporation of these nanoparticles into a filmogenic matrix of chitosan made it possible to obtain bionanocomposite films with improved properties. The water‐vapor permeability was reduced by 70%, whereas the tensile strength and Young's modulus increased by up to 136 and 224% respectively. The developed films were applied as interleaving of sliced cheese, and the efficiency was assessed by investigation of adhesion between the surfaces and by comparing its properties with two commercial interleaving products (polyethylene (PE), and Greasepel paper (GP)). Concluding, the developed films showed a substantial potential to be exploited as an interleaving film, owing to its excellent mechanical properties, permeability, hydrophobicity, and low surface adhesion compared to pure chitosan, PE, and GP films. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43033.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.43033