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Effect of pigment concentration on NMR relaxometry in acrylic paints
Author(s) -
Rooney Mary,
Meldrum Tyler
Publication year - 2020
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.5053
Subject(s) - relaxometry , gloss (optics) , emulsion , chemistry , pigment , chemical engineering , acrylic resin , polymer science , organic chemistry , coating , medicine , spin echo , magnetic resonance imaging , engineering , radiology
Acrylic emulsion paint is among the most common media employed by 20th century artists. Since early acrylic paintings have begun to require the attention of conservators, scientists are working to characterize the properties of these paints to facilitate conservation efforts. In this study, we report an investigation of the physical and chemical properties of acrylic emulsion paints using single‐sided NMR in conjunction with gloss measurements and scanning electron microscopy‐energy dispersive spectrometry. Combining the data from these techniques gives insight into pigment‐base interactions and the acrylic curing process, showing that as pigment concentration is increased in paints, the amount of acrylic base adsorbed to pigment particles increases, resulting in films with differing relaxation times. This research both emphasizes and contextualizes the utility of NMR relaxometry in studying cultural heritage objects and prompts further study into the effects of pigment concentration on the curing and conservation of paint films.