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|a Spathis, Panayotis
|4 aut
|9 1071422
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| 245 |
1 |
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|a Influence of Titanium Dioxide Pigments on the Photodegradation of Paraloid Acrylic Resin
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| 520 |
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|a SUMARRIES. Marble and stone used as building materials are susceptible to environmental damage. Polymers can be used as carriers of suitable pigments for the protection of the surface of a monument. The photodegradation of a series of Paraloid B72 films containing titanium dioxide (TiOj pigments has been studied under UV irradiation. Two kinds of TiO2, anatase and anatase/rutile mixture, were used in different concentrations, 5, 15 and 30% w/w. The chemical and molecular changes induced by the irradiation treatment were followed by Fourier transform infrared spectroscopy, gel permeation chromatography, and solubility measurements. The presence of anatase pigment significantly improved the photostability of Paraloid films.
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|a CONCLUSION. To begin with, it seems that the presence of titanium dioxide pigments in Paraloid B72 films significantly improved the photostabilization of films against UV irradiation. FTIR spectra showed that anatase provided greater photoprotection than the anatase/rutile mixture, in the following order: 30% w/w anatase > 15% w/w anatase > 15% w/w anatase/rutile. The same order was also confirmed by the GPC measurement. The pigments most probably acted as physical UV absorbers because they did not come in contact with atmospheric oxygen and water. Anatase with specific surface (250m2g-1) showed better results than anatase/ rutile (65m2g-1) under the same experimental conditions. However, this conclusion is partially opposed to that derived from the measurement of solubility, where the pure Paraloid film after irradiation showed better results (much smaller percent insoluble fraction) than that of the mixture with 15% w/w anatase/rutile.
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| 700 |
1 |
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|a Karagiannidou, Evi
|4 aut
|9 1071423
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| 700 |
1 |
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|a Magoula, Anastasia-Eleni
|4 aut
|9 1071424
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| 773 |
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|t Studies in Conservation
|d London: The International Institute for Conservation of Historic and Artistic Works, 2003, vol. 48, num. 1, s. 57-64
|x ISSN 0039-3630
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| 856 |
4 |
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|u http://www.viks.sk/chk/studcon_1_03_57_64.doc
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