Photoreactivity of Oil and Alcoholic Diterpenic Varnishes: Key Role of the Polymerization Process
The 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 photodegradation of sandarac and rosin under simulated solar light was studied using a multianalytical approach using a second...
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| Veröffentlicht in: | ChemistrySelect (Weinheim) 2020-07, Vol.5 (27), p.8106-8117 |
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| creator | Azemard, Clara Ménager, Matthieu Sarakha, Mohamed Vieillescazes, Catherine |
| description | The 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 photodegradation 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.
The photodegradation of sandarac and rosin under simulated solar light undergo a two steps reaction. In a first step, main terpene molecules underwent esterification and perestererifications via the formation of hydroperoxides preferentially formed on tertiary carbons. In a second step, these esters and perester bonds underwent photoscissions by Norrish I and II reactions, leading to the production of free terpenes in the varnishes. |
| doi_str_mv | 10.1002/slct.202001873 |
| format | Article |
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The photodegradation of sandarac and rosin under simulated solar light undergo a two steps reaction. In a first step, main terpene molecules underwent esterification and perestererifications via the formation of hydroperoxides preferentially formed on tertiary carbons. In a second step, these esters and perester bonds underwent photoscissions by Norrish I and II reactions, leading to the production of free terpenes in the varnishes.</description><identifier>ISSN: 2365-6549</identifier><identifier>EISSN: 2365-6549</identifier><identifier>DOI: 10.1002/slct.202001873</identifier><language>eng</language><publisher>Wiley</publisher><subject>Chemical Sciences ; Cultural heritage and museology ; Diterpenic resin ; Gas chromatography ; Humanities and Social Sciences ; IR spectroscopy ; Photochemistry ; Polymerization ; Polymers ; Varnish</subject><ispartof>ChemistrySelect (Weinheim), 2020-07, Vol.5 (27), p.8106-8117</ispartof><rights>2020 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c3183-61a3e7f56e635bc2792ca9ea3d12d7c116a6fea069bacaee5670c0fea842bccf3</cites><orcidid>0000-0001-5526-8117 ; 0000-0003-2938-264X ; 0000-0002-4651-7983</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2Fslct.202001873$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fslct.202001873$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>230,314,776,780,881,1411,27901,27902,45550,45551</link.rule.ids><backlink>$$Uhttps://hal.science/hal-03173708$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Azemard, Clara</creatorcontrib><creatorcontrib>Ménager, Matthieu</creatorcontrib><creatorcontrib>Sarakha, Mohamed</creatorcontrib><creatorcontrib>Vieillescazes, Catherine</creatorcontrib><title>Photoreactivity of Oil and Alcoholic Diterpenic Varnishes: Key Role of the Polymerization Process</title><title>ChemistrySelect (Weinheim)</title><description>The 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 photodegradation 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.
The photodegradation of sandarac and rosin under simulated solar light undergo a two steps reaction. In a first step, main terpene molecules underwent esterification and perestererifications via the formation of hydroperoxides preferentially formed on tertiary carbons. In a second step, these esters and perester bonds underwent photoscissions by Norrish I and II reactions, leading to the production of free terpenes in the varnishes.</description><subject>Chemical Sciences</subject><subject>Cultural heritage and museology</subject><subject>Diterpenic resin</subject><subject>Gas chromatography</subject><subject>Humanities and Social Sciences</subject><subject>IR spectroscopy</subject><subject>Photochemistry</subject><subject>Polymerization</subject><subject>Polymers</subject><subject>Varnish</subject><issn>2365-6549</issn><issn>2365-6549</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNqFkDtPwzAUhS0EEhV0ZfbKkOJH4yRsVXkUUakVFFbr1r1RjNy4sqOi8OtJVFTYmO7R0ffd4RByxdmIMyZuojPNSDDBGM8zeUIGQqo0Uem4OP2Tz8kwxg_WQSpXIs0GBJaVb3xAMI3d26alvqQL6yjUGzpxxlfeWUPvbINhh3UX3yHUNlYYb-kztvTFO-ydpkK69K7dYrBf0Fhf02XwBmO8JGcluIjDn3tB3h7uV9NZMl88Pk0n88RInstEcZCYlalCJdO1EVkhDBQIcsPFJjOcK1AlAlPFGgwgpipjhnVNPhZrY0p5Qa4PfytwehfsFkKrPVg9m8x13zHJM5mxfM87dnRgTfAxBiyPAme631P3e-rjnp1QHIRP67D9h9av8-nq1_0GedN7MQ</recordid><startdate>20200723</startdate><enddate>20200723</enddate><creator>Azemard, Clara</creator><creator>Ménager, Matthieu</creator><creator>Sarakha, Mohamed</creator><creator>Vieillescazes, Catherine</creator><general>Wiley</general><scope>AAYXX</scope><scope>CITATION</scope><scope>1XC</scope><scope>BXJBU</scope><scope>IHQJB</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0001-5526-8117</orcidid><orcidid>https://orcid.org/0000-0003-2938-264X</orcidid><orcidid>https://orcid.org/0000-0002-4651-7983</orcidid></search><sort><creationdate>20200723</creationdate><title>Photoreactivity of Oil and Alcoholic Diterpenic Varnishes: Key Role of the Polymerization Process</title><author>Azemard, Clara ; Ménager, Matthieu ; Sarakha, Mohamed ; Vieillescazes, Catherine</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3183-61a3e7f56e635bc2792ca9ea3d12d7c116a6fea069bacaee5670c0fea842bccf3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Chemical Sciences</topic><topic>Cultural heritage and museology</topic><topic>Diterpenic resin</topic><topic>Gas chromatography</topic><topic>Humanities and Social Sciences</topic><topic>IR spectroscopy</topic><topic>Photochemistry</topic><topic>Polymerization</topic><topic>Polymers</topic><topic>Varnish</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Azemard, Clara</creatorcontrib><creatorcontrib>Ménager, Matthieu</creatorcontrib><creatorcontrib>Sarakha, Mohamed</creatorcontrib><creatorcontrib>Vieillescazes, Catherine</creatorcontrib><collection>CrossRef</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>HAL-SHS: Archive ouverte en Sciences de l'Homme et de la Société</collection><collection>HAL-SHS: Archive ouverte en Sciences de l'Homme et de la Société (Open Access)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>ChemistrySelect (Weinheim)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Azemard, Clara</au><au>Ménager, Matthieu</au><au>Sarakha, Mohamed</au><au>Vieillescazes, Catherine</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Photoreactivity of Oil and Alcoholic Diterpenic Varnishes: Key Role of the Polymerization Process</atitle><jtitle>ChemistrySelect (Weinheim)</jtitle><date>2020-07-23</date><risdate>2020</risdate><volume>5</volume><issue>27</issue><spage>8106</spage><epage>8117</epage><pages>8106-8117</pages><issn>2365-6549</issn><eissn>2365-6549</eissn><abstract>The 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 photodegradation 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.
The photodegradation of sandarac and rosin under simulated solar light undergo a two steps reaction. In a first step, main terpene molecules underwent esterification and perestererifications via the formation of hydroperoxides preferentially formed on tertiary carbons. In a second step, these esters and perester bonds underwent photoscissions by Norrish I and II reactions, leading to the production of free terpenes in the varnishes.</abstract><pub>Wiley</pub><doi>10.1002/slct.202001873</doi><tpages>12</tpages><orcidid>https://orcid.org/0000-0001-5526-8117</orcidid><orcidid>https://orcid.org/0000-0003-2938-264X</orcidid><orcidid>https://orcid.org/0000-0002-4651-7983</orcidid><oa>free_for_read</oa></addata></record> |
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| source | Wiley Online Library Journals Frontfile Complete |
| subjects | Chemical Sciences Cultural heritage and museology Diterpenic resin Gas chromatography Humanities and Social Sciences IR spectroscopy Photochemistry Polymerization Polymers Varnish |
| title | Photoreactivity of Oil and Alcoholic Diterpenic Varnishes: Key Role of the Polymerization Process |
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