Abstract
In this investigation on the mechanical behaviour of paint films, we use a new ferrule-top nanoindentation protocol developed for cultural heritage studies to examine the impact of repeated relative humidity variations on the viscoelastic behaviour of paint films and their mechanical properties in different paint stratigraphies through the changes in their storage and loss moduli. We show that the moisture weathering impact on the micromechanics varies for each of these pigment-oil systems. Data from the nanoindentation protocol provide new insights into the evolution of the viscoelastic properties dsue to the impact of moisture weathering on paint films.
Highlights
Evolution of the mechanical properties of oil paints through drying, natural aging, or moisture and temperature variations can induce internal stresses and may lead to macroscopic alteration such as crack initiation and delamination [1,2,3]
To access the paint layer’s sensitivity to moisture uptake and quantify the difference in terms of mechanical behaviour, induced by the layer position within the stratigraphy, we aim to study the properties of those layers that are located between other layers in the stratigraphy
The mechanical properties at the initial state are measured via indentation, before any relatives humidity (RH) variations
Summary
Evolution of the mechanical properties of oil paints through drying, natural aging, or moisture and temperature variations can induce internal stresses and may lead to macroscopic alteration such as crack initiation and delamination [1,2,3]. Previous research has quantified the mechanical properties of oil paints and evaluated the influence of some pigments and binding media on the layers’ mechanical properties. They studied how chemical processes inherent to the material composition of the. To the natural aging processes of oil and pigment combinations, and inherent chemical changes, environmental conditions can modify their mechanical behaviour [1, 4, 8,9,10]. Temperature and moisture content variations are both external parameters that may induce significant modification of the mechanical response of painting supports such as canvas or panel, as well as the various ground, paint and varnish layers, depending on their composition [11,12,13,14]
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