Tesi etd-11252025-155024 |
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Tipo di tesi
Tesi di laurea magistrale
Autore
DEL GRONCHIO, VIOLA
URN
etd-11252025-155024
Titolo
Studio di poli(vinil alcol) e oli vegetali epossidati per lo sviluppo di materiali compositi caricati con tungsteno nell’ambito della produzione industriale sostenibile di sonde ecografiche.
Dipartimento
CHIMICA E CHIMICA INDUSTRIALE
Corso di studi
CHIMICA INDUSTRIALE
Relatori
relatore Prof. Puppi, Dario
relatore Prof.ssa Totaro, Grazia
relatore Prof.ssa Totaro, Grazia
Parole chiave
- crosslinking
- epoxidation
- matching layer
- poly(vinyl alcohol)
- vegetable oils
Data inizio appello
11/12/2025
Consultabilità
Non consultabile
Data di rilascio
11/12/2095
Riassunto
The aim of this thesis was to identify and develop sustainable solutions for the development of new materials to be used in the manufacturing of acoustic matching layers for ultrasound probes, as an alternative to the petrochemical-derived epoxy resins used industrially. The goal is to: i) contribute to a gradual transition from the use of fossil-origin materials towards natural-origin materials derived from biomass; ii) reduce health and environmental risks caused by the use of toxic components; iii) reduce the waste of W, which is precious and has a high environmental impact.
Poly(vinyl alcohol) (PVA) and vegetable oils from linseed, sunflower, and safflower were selected. Starting from these materials, composites with W were created. In the case of PVA, the materials were prepared via the solvent casting technique, at two different W concentrations (60% and 90% w/w relative to the polymer) with the aim of obtaining acoustic matching layers with acoustic impedance values suitable for the passage of ultrasound from inside the ultrasound probe to biological tissues. To ensure stability in water, these materials were crosslinked using two different crosslinking agents: glutaraldehyde (GA) and citric acid (CA), as a more sustainable alternative.
The vegetable oils, further possible substitutes for epoxy resins, were functionalized through an epoxidation reaction and subsequently crosslinked using tannic acid, so as to obtain a completely bio-based epoxy resin. After an initial screening of the three selected oils, epoxidized linseed oil was used for the development of the composites with W (60% and 90% w/w relative to the polymer).
Poly(vinyl alcohol) (PVA) and vegetable oils from linseed, sunflower, and safflower were selected. Starting from these materials, composites with W were created. In the case of PVA, the materials were prepared via the solvent casting technique, at two different W concentrations (60% and 90% w/w relative to the polymer) with the aim of obtaining acoustic matching layers with acoustic impedance values suitable for the passage of ultrasound from inside the ultrasound probe to biological tissues. To ensure stability in water, these materials were crosslinked using two different crosslinking agents: glutaraldehyde (GA) and citric acid (CA), as a more sustainable alternative.
The vegetable oils, further possible substitutes for epoxy resins, were functionalized through an epoxidation reaction and subsequently crosslinked using tannic acid, so as to obtain a completely bio-based epoxy resin. After an initial screening of the three selected oils, epoxidized linseed oil was used for the development of the composites with W (60% and 90% w/w relative to the polymer).
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