Absorption Performances of PLA-Montmorillonite Nanocomposites Thin Films in Salisbury and Rozanov Configurations: Influence of Aging and Mechanical Recycling

The present paper aims to address the crucial concern of pollution induced by growing plastic waste and electromagnetic interference (EMI). Nanocomposites combining poly(lactic acid) (PLA) and organo-modified montmorillonite (OMMT) are synthesized and compression molded into thin films. A first set...

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Bibliographic Details
Published in:Micromachines (Basel) 2022-12, Vol.13 (12), p.2152
Main Authors: Sidi Salah, Lakhdar, Ouslimani, Nassira, Danlée, Yann, Huynen, Isabelle
Format: Article
Language:English
Subjects:
Aging
artificial aging
Clay
Compacting
Comparative analysis
Configurations
Design
Dielectric films
Electromagnetic interference
Electromagnetic shielding
Electromagnetism
EMI shielding
Extremely high frequencies
Extrusion molding
Film thickness
Gauges
mechanical recycling
Metal foils
Microwave absorption
Montmorillonite
Nanocomposites
Optimization
organo-modified montmorillonite
PLA composites
Polylactic acid
Polymers
Pressure molding
Radiation
Recycling
Thin films
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Summary:The present paper aims to address the crucial concern of pollution induced by growing plastic waste and electromagnetic interference (EMI). Nanocomposites combining poly(lactic acid) (PLA) and organo-modified montmorillonite (OMMT) are synthesized and compression molded into thin films. A first set of samples, referred as virgin, was kept as is, while a second set of samples were photochemically, thermally and hydrolytically aged before mechanical recycling via extruding and second compression molding, resulting in the so-called recycled composite. The electromagnetic (EM) properties with a focus on microwave absorption performances of virgin and recycled samples are compared for various thicknesses and weight concentrations of OMMT in PLA matrix. The EM performances are gauges by Rozanov and Salisbury structures that consist in one- and two-layer stacks of composite films back-coated by a metal foil. Characterization in Rozanov configuration shows an average absorption index over the Ka band of 29.3% and 21.1% for, respectively, virgin and recycled PLA reinforced with 4 wt.% OMMT. An optimization of the film thickness is proposed; up to 61.85% and 80% of absorption with a thickness of 1.4 mm and 3.75 mm, respectively, is reached with a metal back-coated rPLA-4%OMMT film. Characterization in Salisbury configuration gives advantage to the recycled structure with an average absorption of 49.6% for a total thickness of 1.4 mm. The requirements of EMI shielding are met by PLA-OMMT composites with a certain benefit of recycling process on EM performance.
ISSN:2072-666X
2072-666X
DOI:10.3390/mi13122152