Guerra, Federica
(2021)
Exploring Tannins from wood biomass as bioadditives for bioplastics.
[Laurea magistrale], Università di Bologna, Corso di Studio in
Ingegneria chimica e di processo [LM-DM270], Documento ad accesso riservato.
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Abstract
Synthetic plastics are considered as the most important materials in the world. However, recent studies have demonstrated how their diffusion has raised also environmental issues, especially due to their low biodegradability and poor recycling process.
In order to overcome these limitations, the scientific community has analysed the use of biopolymers. In particular, the polyhydroxyalkanoates (PHAs) have attracted a lot of interest, since they are produced by microorganisms and they are easily available.
Biopolymers used at the industrial scale need to be formulated with additives to be fully responding in terms of physical-mechanical properties, processability, durability and more. However, the selection of additives for bioplastics is made complex by the restrictions to be followed and their impact on the environment is not always negligible.
Several kinds of natural molecules have been recently proposed as functional additives for bioplastics, as the
hydrolysable and condensed tannins which are waste-biomass derivatives having a functionality as aromatic antioxidants units, potential antibacterial activity and thermal stabilizers.
The purpose of this thesis is to develop novel bio-based plastics by including tannins in their formulation, and to assess their overall effect on the bioplastic's properties.
Hydrolizable tannins from chestnut wood coming from a research laboratory at the University of Padova, have been used.
As bioplastic matrix, we selected polyhydroxyalkanoates (PHAs) for the emerging potential as feasible sustainable substitutes for both standard and technical plastic grades.
In order to assess the best strategies for including tannin molecules in PHA matrices, three different approaches have been developed:
1- SOLUTION MIXING
2- MELT MIXING
3- EMULSION MIXING
The amount of tannin in the formulation has been varied from 0 to 5% and the samples have been fully characterised in terms of thermal properties and UV absorption.
Abstract
Synthetic plastics are considered as the most important materials in the world. However, recent studies have demonstrated how their diffusion has raised also environmental issues, especially due to their low biodegradability and poor recycling process.
In order to overcome these limitations, the scientific community has analysed the use of biopolymers. In particular, the polyhydroxyalkanoates (PHAs) have attracted a lot of interest, since they are produced by microorganisms and they are easily available.
Biopolymers used at the industrial scale need to be formulated with additives to be fully responding in terms of physical-mechanical properties, processability, durability and more. However, the selection of additives for bioplastics is made complex by the restrictions to be followed and their impact on the environment is not always negligible.
Several kinds of natural molecules have been recently proposed as functional additives for bioplastics, as the
hydrolysable and condensed tannins which are waste-biomass derivatives having a functionality as aromatic antioxidants units, potential antibacterial activity and thermal stabilizers.
The purpose of this thesis is to develop novel bio-based plastics by including tannins in their formulation, and to assess their overall effect on the bioplastic's properties.
Hydrolizable tannins from chestnut wood coming from a research laboratory at the University of Padova, have been used.
As bioplastic matrix, we selected polyhydroxyalkanoates (PHAs) for the emerging potential as feasible sustainable substitutes for both standard and technical plastic grades.
In order to assess the best strategies for including tannin molecules in PHA matrices, three different approaches have been developed:
1- SOLUTION MIXING
2- MELT MIXING
3- EMULSION MIXING
The amount of tannin in the formulation has been varied from 0 to 5% and the samples have been fully characterised in terms of thermal properties and UV absorption.
Tipologia del documento
Tesi di laurea
(Laurea magistrale)
Autore della tesi
Guerra, Federica
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Indirizzo
Sustainable technologies and biotechnologies for energy and materials
Ordinamento Cds
DM270
Parole chiave
Polyhydroxyalkanoates,Tannins,bioplastics,additives
Data di discussione della Tesi
8 Ottobre 2021
URI
Altri metadati
Tipologia del documento
Tesi di laurea
(NON SPECIFICATO)
Autore della tesi
Guerra, Federica
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Indirizzo
Sustainable technologies and biotechnologies for energy and materials
Ordinamento Cds
DM270
Parole chiave
Polyhydroxyalkanoates,Tannins,bioplastics,additives
Data di discussione della Tesi
8 Ottobre 2021
URI
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