Study of ageing of ketone resins used as picture varnishes by FTIR spectroscopy, UV-Vis spectrophotometry, atomic force microscopy and scanning electron microscopy X-ray microanalysis

This paper presents a study of thin films of the commercial ketone resins Laropal K80, Keton N and MS2A, attempting to reproduce the pictorial layers and protective finishes commonly present in contemporary paintings. Chemical and morphological changes due to the degradation effect of environmental...

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Bibliographic Details
Published in:Analytical and bioanalytical chemistry 2008-06, Vol.391 (4), p.1351-1359
Main Authors: Doménech-Carbó, María Teresa, Yusá-Marco, Dolores Julia, Bitossi, Giovanna, Silva, Miguel F, Mas-Barberá, Xavier, Osete-Cortina, Laura
Format: Article
Language:English
Subjects:
Analytical Chemistry
Atomic force microscopy
Biochemistry
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Food Science
FTIR spectroscopy
Ketone varnish
Laboratory Medicine
Monitoring/Environmental Analysis
Original Paper
Scanning electron microscopy energy dispersive X-ray microanalysis
UV-Vis spectrophotometry
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Summary:This paper presents a study of thin films of the commercial ketone resins Laropal K80, Keton N and MS2A, attempting to reproduce the pictorial layers and protective finishes commonly present in contemporary paintings. Chemical and morphological changes due to the degradation effect of environmental agents have been specially considered. For this purpose, 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. Spectroscopic techniques such as FTIR spectroscopy and UV-Vis spectrophotometry were applied in combination with microscopic examination techniques, namely, AFM and scanning electron microscopy energy dispersive X-ray microanalysis (SEM-EDX). Chemical changes due to UV light and thermal ageing are in good agreement with those previously reported in the literature. Bleaching exhibited by the three commercial products after exposure to a SO₂-saturated atmosphere has been related to the diffusion of SO₂-rich water vapour into the film. This effect was particularly strong in the MS2A resin due to the higher content of hydroxyl groups in this product.
ISSN:1618-2642
1618-2650
DOI:10.1007/s00216-008-1864-8