This thesis project is based on the study of blends based on polylactic acid (PLA) and mineral additives, with the aim of improving the gas barrier performance of the latter with the potential application in the context of flexible packaging. To this purpose, a number of mineral fillers were first selected in powder form, specifically calcium carbonate from eggshells and functionalized alumino-silicate nano-clays that, from the published papers, showed anything interesting for improving impermeability to oxygen, carbon dioxide, and water vapor. The dispersion of these mineral fillers in the polymer matrix was carried out by mixing in a molten state in a plastograph, and the films were made by compression molding. The latter were then characterized chemically (FT-IR), thermally (DSC, TGA), morphologically (ESEM), mechanically and at gas permeability for determination of the effects of the fillers in the PLA matrix.
Il presente progetto di tesi si basa sullo studio di miscele a base di acido polilattico (PLA) e additivi minerali, con l'obbietivo di migliorare le prestazione barriera ai gas di quest'ultimo in un'ottica di potenziale applicazione nel contesto degli imballaggi flessibili. A questo fine sono state dapprima selezionate alcune cariche minerali in forma di polvere, in particolare carbonato di calcio da gusci d'uova e nano-argille funzionalizzate a base di allumino-silicati che, da letteratura, risultavano promettenti per il miglioramento dell'impermeabilità a ossigeno, anidride carbonica, vapor acqueo. La dispersione di queste cariche minerali nella matrice polimerica è stata effettuata mediante miscelazione allo stato fuso in plastografo e i film sono stati realizzati mediante stampaggio a compressione. Quest'ultimi sono poi stati caratterizzati a livello chimico (FT-IR), termico (DSC, TGA), morfologico (ESEM), meccanico e alla permeabilità ai gas, per la determinazione degli effetti delle cariche nella matrice di PLA.
Sviluppo e caratterizzazione di compound a base PLA additivato con cariche minerali per film barriera
CALZAVARA, ALESSANDRO
2022/2023
Abstract
This thesis project is based on the study of blends based on polylactic acid (PLA) and mineral additives, with the aim of improving the gas barrier performance of the latter with the potential application in the context of flexible packaging. To this purpose, a number of mineral fillers were first selected in powder form, specifically calcium carbonate from eggshells and functionalized alumino-silicate nano-clays that, from the published papers, showed anything interesting for improving impermeability to oxygen, carbon dioxide, and water vapor. The dispersion of these mineral fillers in the polymer matrix was carried out by mixing in a molten state in a plastograph, and the films were made by compression molding. The latter were then characterized chemically (FT-IR), thermally (DSC, TGA), morphologically (ESEM), mechanically and at gas permeability for determination of the effects of the fillers in the PLA matrix.File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.12608/58615