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dc.creatorAzémard, Clara
dc.creatorMénager, Matthieu
dc.creatorSarakha, Mohamed
dc.creatorVieillescazes, Cathy
dc.date.accessioned2021-02-01T14:25:16Z
dc.date.available2021-02-01T14:25:16Z
dc.date.issued2020
dc.identifier.citationhttps://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/slct.202001873
dc.identifier.issn2365-6549
dc.identifier.urihttps://hdl.handle.net/10669/82682
dc.description.abstracthe conservation of artworks is a key issue in cultural heritage. The alterations of the varnish could be linked mainly to the photopolymerization of the natural resin. The photodegrada- tion of sandarac and rosin under simulated solar light was studied using a multianalytical approach using a second derivative FT-IR spectroscopy and gas chromatography coupled to mass spectroscopy. In all resins, main terpene molecules underwent esterification and perestererifications via the for- mation of hydroperoxides preferentially formed on tertiary carbons. This polymerization could be associated with the advice of important art manuals and treatises recommending exposing varnishes to the sunlight while drying. In a second step, these esters and perester bonds underwent photo- scissions by Norrish I and II reactions, leading to the production of free terpenes in the varnishes. In sandarac varnishes, the vinyl bonds showed a strong reactivity associated with the formation of trans and cis secondary alkenes. These photo- chemical reactions could explain an important part of the problem of conservation of the varnish layers experienced by museums all over the world.es_ES
dc.language.isoen_USes_ES
dc.sourceChemistry Select 5(27)es_ES
dc.subjectDiterpenic resines_ES
dc.subjectGas chromatographyes_ES
dc.subjectIR spectroscopyes_ES
dc.subjectPhotochemistryes_ES
dc.subjectPolymerizationes_ES
dc.subjectVarnishes_ES
dc.titlePhotoreactivity of Oil and Alcoholic Diterpenic Varnishes: Key Role of the Polymerization Processes_ES
dc.typeartículo original
dc.identifier.doi10.1002/slct.202001873
dc.description.procedenceUCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Sociales::Centro de Investigaciones Antropológicas (CIAN)es_ES


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