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• W2623488425 abstract "Abstract Synthetic resins were introduced in paintings conservation during the 1930s, as an alternative to natural resins, due to their superior resistance to degradation. Their composition usually includes a small amount of additives, such as titanium dioxide. The objective of this work is to study the effect of TiO 2 additive on the durability of Paraloid B72 (acrylic resin) and Laropal A81 (urea-aldehyde condensation polymer), both used in art conservation, against photochemical degradation. A methodology involving separating particulate TiO 2 from the organic fraction of the resins has been applied, followed by accelerated ageing of the resins in their commercial (C) and modified (M, i.e. after TiO 2 removal) has been implemented. The morphological characteristics of resin films were examined through scanning electron microscopy (SEM). Chemical changes, colour properties and photo-chemical stability of the resins were studied with FTIR, UV-Vis absorption spectroscopy and spectro-colorimetry. The results showed a considerably different behaviour between the C and M states of both materials. In particular, C-Paraloid B72 collapses after prolonged irradiation, but within a certain time frame it appears to be relatively stable; on the other hand, C-Laropal A81 is considerably destabilized in comparison to its M state. It can be suggested that TiO 2 acts as a UV-blocker for the underlying pigment layers, at the expense of resins’ stability." @default.
• W2623488425 created "2017-06-15" @default.
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• W2623488425 date "2017-06-08" @default.
• W2623488425 modified "2023-10-01" @default.
• W2623488425 title "The effect of TiO₂ component on the properties of acrylic and urea-aldehyde resins under accelerated ageing conditions" @default.
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• W2623488425 doi "https://doi.org/10.1515/pac-2016-1220" @default.
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