Study of ageing of ketone resins used as picture varnishes by pyrolysis–silylation–gas chromatography–mass spectrometry |
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| Institution: | 1. Swiss Institute for Art Research, Zollikerstrasse 32, 8032 Zürich, Switzerland;2. Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich, Zürich, Switzerland;3. Bern University of Applied Sciences, Fellerstrasse 11, 3027 Bern, Switzerland;4. Cologne Institute for Conservation Science, Cologne University of Applied Sciences, Ubierring 40, 50678 Köln, Germany;1. Dipartimento di Chimica e Chimica Industriale, Universita’ di Pisa, Via Risorgimento 35, 56127 Pisa, Italy;2. National Research Council of Italy, CNR, Istituto di Chimica dei Composti Organo Metallici-ICCOM-UOS Pisa, Area di Ricerca, Via G. Moruzzi 1, 56124 Pisa, Italy;3. National Research Council of Italy, CNR, Istituto per la Conservazione e la Valorizzazione dei Beni Culturali, Via Madonna del Piano 10, 50019 Sesto Fiorentino (FI), Italy;1. Dipartimento di Chimica, Università di Roma “La Sapienza”, P.le Aldo Moro 5, Rome, Italy;2. Dipartimento di Fisica, Università di Roma “La Sapienza”, P.le Aldo Moro 5, Rome, Italy;3. Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, Via della Ricerca Scientifica, Rome, Italy;1. The State Russian Museum, Russian Federation;2. Nanotechnology Research and Education Centre of the Russian Academy of Sciences, Saint Petersburg Academic University, Russian Federation;3. Peter the Great St. Petersburg Polytechnic University, Russian Federation;4. The State Hermitage Museum, Russian Federation;5. St. Petersburg State University, Russian Federation;1. Department of Chemistry and Industrial Chemistry, University of Pisa, Pisa, Italy;2. Conservation Laboratory at the Triennale Design Museum, Milano, Italy;3. Barbara Ferriani S.r.l., Milano, Italy;1. Archaeological Sciences, Life Sciences, University of Bradford, Richmond Road, Bradford, West Yorkshire, BD7 1DP, UK;2. PACEA UMR5199, Laboratoire d''Anthropologie des Populations Passées et Présentes, Université Bordeaux 1, Bât. B8, Avenue des Facultés, 33405, Talence, France;3. The Anglo-Saxon Laboratory, Bootham House, 61 Bootham, York, YO30 7BT, UK;4. Institut für Archäologie, Denkmalkunde und Kunstgeschichte, Universität Bamberg, Am Kranen 14, 96045, Bamberg, Germany;5. Centre for Human Bioarchaeology, Museum of London, 150 London Wall, London, EC2Y 5HN, UK |
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| Abstract: | This contribution presents a research aimed at the study of the commercial products Laropal K80, Keton N and MS2A, ascribed to ketone resins prepared as thin films, in an attempt to reproduce the pictorial layers and protective finishes that are commonplace in contemporary paintings. For this purpose, a new method based on “online” silylation–pyrolysis using hexamethyldisilazane as a derivatisation reagent in pyrolysis–gas chromatography–mass spectrometry (Py–GC–MS) has been proposed. This procedure leads to the unambiguous identification of such varnishes and improves direct Py–GC–MS. Chemical changes due to the degradation effect of environmental agents have been especially considered. To that end, three different accelerated ageing processes were applied to a series of specimens prepared from the studied commercial products: thermal, UV light and ageing in an SO2-polluted chamber. Chemical changes due to UV light ageing of Keton N resin are in good agreement with those previously reported in the literature. |
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