Development of Nanostructured Films Based on PLA and Chitosan Nanoparticles Generated by Supercritical CO2 Assisted Processes

Abstract : In this study, supercritical processes were setup to generate chitosan nanoparticles that were incorporated in biobased PLA films produced by cast extrusion. Firstly, chitosan nanoparticles were generated using two CO 2 based processes: (1) Supercritical AntiSolvent process where CO 2 acts as an antisolvent towards an acetic acid aqueous solution. Nanoparticles with an average size of 378 nm were obtained. (2) Sc-CO 2 assisted solubilisation and atomization process where chitosan was dissolved in CO 2 acidified water followed by spray-drying. Dried nanoparticles with a median diameter of 400 nm were generated. These generated nanoparticles and other chitosan particles were dispersed in PLA (2.4% w/w) by cast extrusion using a micro-compounder. The morphology and properties of the resultant nanostructured composite films were studied. Particles dispersion and size distribution within the films were analysed by optical and scanning electron microscopy and showed a good dispersion of the particles with no agglomeration. Differential scanning calorimetry revealed a nucleating effect of the chitosan nanoparticles.
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Nibal Hijazi, Nicolas Le Moigne, Élisabeth Rodier, Jean‐jacques Letourneau, Martial Sauceau, et al.. Development of Nanostructured Films Based on PLA and Chitosan Nanoparticles Generated by Supercritical CO2 Assisted Processes. 16th European conference on composite materials, University of Seville, Jun 2014, Seville, Spain. ⟨hal-01258547⟩

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