Natural Wax-Based Water Vapour Barrier Coatings on PLA for MAP Food Packaging

Tomei, Lorenzo (2021) Natural Wax-Based Water Vapour Barrier Coatings on PLA for MAP Food Packaging. [Laurea magistrale], Università di Bologna, Corso di Studio in Ingegneria chimica e di processo [LM-DM270]
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Abstract

PLA is a bio-based polymer that is obtained from renewable resources and it is very promising for a sustainable packaging manufacturing. However, its gas and vapour barrier properties are not enough to comply with the requirements of MAP packaging of fresh foods, which need specific concentration of water and oxygen to avoid spoilage and to keep the organoleptic properties unaltered throughout their shelf-life. The use of waxes from natural renewable sources such as plants (e.g., candelilla wax, carnauba wax, rice bran wax, sunflower wax) or animals (e.g., beeswax) could tackle down the permeation of water vapour through the packaging without affecting its bio-based content. The core of this work is developing wax-based coatings with enhanced thermo-mechanical properties so that they can undergo thermoforming and a proper adhesion to the PLA substrate can be ensured. Chemical modifications and crosslinking of waxes are performed to produce wax-based alkyd resins. The synthesised materials are characterised both by DSC and FTIR. Films of the wax-based alkyds are produced in order to assess their water vapour permeability.

Abstract
Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Tomei, Lorenzo
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Indirizzo
Sustainable technologies and biotechnologies for energy and materials
Ordinamento Cds
DM270
Parole chiave
Packaging,Food,Natural waxes,PLA,Alkyd resins,Sustainability,Biopolymers
Data di discussione della Tesi
12 Marzo 2021
URI

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