How chitosan-clay-based coatings contribute to improved poly(lactic acid) (PLA) film properties
Abstract
The feasibility of chitosan and montmorillonite (Cloisite-Na + ) coatings as an alternative oxygen barrier material to biodegradable commercial films (polylactic acid, PLA) was investigated. This work aimed at understanding how active chitosan coatings could affect the functional properties of the PLA films. Moreover, chitosan-based coatings also serve as a support for bioactive molecules. The application of these coatings when containing allyl isothiocyanate (AITC) as an antimicrobial agent, is proved as an efficient active releasing system. PLA films were prepared by cast extrusion process and corona treated prior to being coated by chitosan-Cloisite-Na + suspensions. The incorporation of Cloisite-Na + and/or AITC into chitosan coating increased the oxygen barrier efficacy of PLA films by almost 10 folds. Indeed, the tortuosity of the diffusion path for oxygen molecules, thanks to the nanoclays dispersion, was highly increased. The water vapor permeability of the coated film was not degraded by the hydrophilic character of the chitosan-based layer. FTIR spectra revealed intermolecular interactions between AITC, chitosan and cloisite explaining the improved properties. The release diffusivity of AITC from the chitosan layer without Cloisite-Na + was almost 10000 times higher than that of film containing the Cloisite-Na + at 10%. These active coatings using chitosan is a promising way to improve barrier and functional properties of commercial PLA films.
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BibTeX
@article{fadhel2026chitosanclaybased,
title = {{How chitosan-clay-based coatings contribute to improved poly(lactic acid) (PLA) film properties}},
author = {Meriem Fadhel and Clément Poulain and Claire-Hélène Brachais and Rafaela Rendón and Julio Bruna and Alejandra Torres-Mediano and Frédéric Debeaufort and Francisco Rodríguez-Mercado and Nasreddine Benbettaieb},
journal = {Cleaner Materials},
year = {2026},
month = oct,
doi = {10.1016/j.clema.2026.100377},
url = {https://hal.science/hal-05845704v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - How chitosan-clay-based coatings contribute to improved poly(lactic acid) (PLA) film properties
AU - Meriem Fadhel
AU - Clément Poulain
AU - Claire-Hélène Brachais
AU - Rafaela Rendón
AU - Julio Bruna
AU - Alejandra Torres-Mediano
AU - Frédéric Debeaufort
AU - Francisco Rodríguez-Mercado
AU - Nasreddine Benbettaieb
PY - 2026
DA - 2026/10/30
JO - Cleaner Materials
DO - 10.1016/j.clema.2026.100377
UR - https://hal.science/hal-05845704v1
AB - The feasibility of chitosan and montmorillonite (Cloisite-Na + ) coatings as an alternative oxygen barrier material to biodegradable commercial films (polylactic acid, PLA) was investigated. This work aimed at understanding how active chitosan coatings could affect the functional properties of the PLA films. Moreover, chitosan-based coatings also serve as a support for bioactive molecules. The application of these coatings when containing allyl isothiocyanate (AITC) as an antimicrobial agent, is proved as an efficient active releasing system. PLA films were prepared by cast extrusion process and corona treated prior to being coated by chitosan-Cloisite-Na + suspensions. The incorporation of Cloisite-Na + and/or AITC into chitosan coating increased the oxygen barrier efficacy of PLA films by almost 10 folds. Indeed, the tortuosity of the diffusion path for oxygen molecules, thanks to the nanoclays dispersion, was highly increased. The water vapor permeability of the coated film was not degraded by the hydrophilic character of the chitosan-based layer. FTIR spectra revealed intermolecular interactions between AITC, chitosan and cloisite explaining the improved properties. The release diffusivity of AITC from the chitosan layer without Cloisite-Na + was almost 10000 times higher than that of film containing the Cloisite-Na + at 10%. These active coatings using chitosan is a promising way to improve barrier and functional properties of commercial PLA films.
SN - 2772-3976
ER -