Tesi etd-05102022-170407 |
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Tipo di tesi
Tesi di dottorato di ricerca
Autore
PIZZIMENTI, SILVIA
URN
etd-05102022-170407
Titolo
The chemistry of artists’ oil paints
Settore scientifico disciplinare
CHIM/02
Corso di studi
SCIENZE CHIMICHE E DEI MATERIALI
Relatori
tutor Prof.ssa Duce, Celia
relatore Prof.ssa Bonaduce, Ilaria
relatore Prof.ssa Bonaduce, Ilaria
Parole chiave
- cadmium red
- curing process
- lead white
- linseed oil
- mass spectrometry
- oil autoxidation
- oil paint
- safflower oil
- thermal analysis
- ultramarine blue
Data inizio appello
27/05/2022
Consultabilità
Non consultabile
Data di rilascio
27/05/2025
Riassunto
Oil paintings from the 20th and 21st centuries present a range of conservation issues different from those of paintings realised in the previous centuries. These issues are believed to be correlated with the use of manufactured artists’ oil paints, which contained driers, fillers and stabilisers, modified oils, semi-drying oils and a range of pigments. The chemical nature of the changes occurring in the film former as a consequence of degradation is, in most cases, not fully understood at the molecular level. It has been hypothesised that some degradation phenomena taking place in oil paintings - especially those produced with modern manufactured artists’ oil paints - are related to the chemical nature of the oil cross-linked network, and in particular, to a low degree of polymerization and a high degree of oxidation. The polymeric as well as the highly complex multi-component nature of paint films do not allow a straightforward characterization of its molecular features. However, a useful approach to improve our understanding of the chemical structure of the paint film is the characterisation of the process leading to its formation: the curing. In this context, the principal aim of my Ph.D. project was to implement a methodological approach to monitor physico-chemical changes of oil paints upon curing and ageing. In particular, great effort was made to design a methodological approach able to characterise the effect of different oils, pigments and driers on the autoxidation kinetics, to monitor the evolution of oxidation products, to evaluate the magnitude of oxidative degradation and cross-linking phenomena, and to determine the structure of the cross-linked fractions.
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