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Oil based paints dry by a process of autoxidation, where an oxygen molecule is added between two unsaturated fatty acid chains to form a polymeric structure. The paints themselves are complex mixtures of chemicals, including pigments, oils and other components. FTIR spectroscopy allows for these components to be probed and can be used to gain insights into the drying process.
The ASTM method STP1119 [1] describes various methods for the analysis of paint by FTIR spectroscopy.
One such method looks at time-resolved spectroscopy of samples painted onto KBr windows, with spectra recorded of the drying paints every two hours over multiple days. Until recently, transmission spectroscopy offered clear advantages over ATR spectroscopy for the study of such long duration experiments. The use of multiple KBr windows allows many similar experiments to be run side by side, whilst the cost of a diamond ATR puck would limit the analyst to one sample at a time. The advent of low-cost consumable ATR slides opens the door to apply the methods describe in the standard to ATR spectroscopy.
Here we investigate the drying of linseed oil based paints with various colour pigments.
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