Abstract
In this study, the chemistry of air-drying artist’s oil paint curing and aging up to 24 months was studied. The objective is to improve our molecular understating of the processes that lead to the ...
Highlights
Paint consists of finely divided pigment particles the discontinuous phase dispersed in an organic fluid binder the continuous phase
Our approach is based on isothermal thermogravimetric (TG) analysis to study the kinetics of the oil oxidation and estimate the oxidative degradation, differential scanning calorimetry (DSC) to monitor the presence of hydroperoxides and active radicals over time and to evaluate the stability of peroxides formed in the paint layers, gas chromatography− mass spectrometry (GC−MS) to investigate the noncovalently cross-linked fractions, and analytical pyrolysis coupled with gas chromatography and mass spectrometry (Py−gas chromatography−mass spectrometry (GC−MS)) to characterize the whole organic fraction of the model paintings, including the cross-linked network
For both oil binders, lead white (LW)-based paint layers dry faster than those based on ultramarine blue (UB)
Summary
Paint consists of finely divided pigment particles the discontinuous phase dispersed in an organic fluid binder the continuous phase. It was recently hypothesized that some degradation phenomena taking place in oil paintings especially those produced with modern manufactured artists’ oil paints[2] 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.[10,23,25,31,41]. Our approach is based on isothermal thermogravimetric (TG) analysis to study the kinetics of the oil oxidation and estimate the oxidative degradation, differential scanning calorimetry (DSC) to monitor the presence of hydroperoxides and active radicals over time and to evaluate the stability of peroxides formed in the paint layers, gas chromatography− mass spectrometry (GC−MS) to investigate the noncovalently cross-linked fractions, and analytical pyrolysis coupled with gas chromatography and mass spectrometry (Py−GC−MS) to characterize the whole organic fraction of the model paintings, including the cross-linked network. The final aim is to improve our understanding of the curing of artistic air-drying oil paints, the phenomena that occur in a paint film over time and to correlate them to the characteristics and stability of the paint film
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