MARCOS VINICIUS RODRIGUES ALVES
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Artigo IPEN-doc 27191 Material characterization of exudates from Brazilian contemporary oil painting by FTIR, Py-GC/MS and SEM-EDS2020 - REDÍGOLO, M.M.; ALVES, M.V.R.; REIS, T.R. dos; CARNEIRO, T.C.; COSTA, I.; BUSTILLOS, O.V.Contemporary art has employed almost every single synthetic material created by man. Nonetheless, the appeal of oil paint is still present at most public and private collections. Oil paint manufacture has evolved over time along with its formulation and conservation concerns. A reported problem is the formation of exudates on contemporary oil paintings. This work aims to characterize exudates from the Brazilian oil painting “Três pessoas” (1999), by Marina Saleme. Characterization was carried out by Fourier transform infrared spectroscopy, pyrolysis coupled to gas chromatography and mass spectrometry and scanning electron microscopy coupled to energy dispersive x-ray fluorescence spectrometry. Results indicate that exudates are formed by the oxidation of linseed oil and formation of dicarboxylic acids. This process is aided by the formation of zinc stearate in the paint film.Artigo IPEN-doc 26395 A multi-analytical study of Brazilian commercial acrylic paint of artistic use2019 - REDÍGOLO, MARCELO M.; ALVES, MARCOS V.R.; COSTA, ISOLDA; BUSTILLOS, OSCAR V.Contemporary Brazilian artists worked massively with paints made in Brazil. Conservation of acrylic paints is an issue and has been studied for the past two decades. European and North American paints were studied in detail, but there is scarce information on paints produced in other countries. Therefore, it is vital to characterize Brazilian artist paint and better understand their ageing process, outlining proper conservation methodologies then. Complementary analytical techniques were employed to characterize the paint samples, namely pyrolysis gas chromatography-mass spectrometry (Py-GC/MS), Fourier transform infrared (FTIR) and Raman spectroscopies and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS). Results indicate that Brazilian acrylic blue paints (phthalocyanine and Prussian) are composed of polystyrene (PS) copolymers, in contrast to imported paints, mainly composed of poly(metyhl methacrylate) (PMMA) copolymers.