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Mechanism of Photoinitiated Free Radical Polymerization by Thioxanthone-Anthracene in the Presence of Air

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dc.contributor.authorBalta, Demet Karaca
dc.contributor.authorArsu, Nergis
dc.contributor.authorYagci, Yusuf
dc.contributor.authorSundaresan, Arun K.
dc.contributor.authorJockusch, Steffen
dc.contributor.authorTurro, Nicholas J.
dc.contributor.institutionauthorARSU, Nergis
dc.date.accessioned2026-06-27T13:15:35Z
dc.date.issued2011
dc.description.abstractThe mechanism of formation of initiating radicals for free radical polymerization by the thioxanthone anthracene (TX-A) photoinitiator was investigated by laser flash photolysis, fluorescence and phosphorescence spectroscopy, and polymerization studies. The proposed mechanism of photoinitiation involves photoexcitation of TX-A and quenching of triplet excited states of TX-A by molecular oxygen to generate singlet oxygen. Singlet oxygen reacts with the anthracene moiety of TX-A to form an endoperoxide. The endoperoxide intermediate was isolated and characterized by MS and H-1 NMR The endoperoxide undergoes photochemical or thermal decomposition to generate radicals which are able to initiate free radical polymerization. A significant deuterium effect on the polymerization rates using CDCl3 and CHCl3 as solvents confirmed the involvement of singlet oxygen in the initiation process.en
dc.description.sponsorshipNational Science Foundation [NSF-CHE-07-17518]
dc.description.sponsorshipYildiz Technical University
dc.description.sponsorshipTUBITAK
dc.description.sponsorshipIstanbul Technical University
dc.description.sponsorshipDirect For Mathematical & Physical Scien
dc.description.sponsorshipDivision Of Chemistry [0717518] Funding Source: National Science Foundation
dc.description.urihttps://doi.org/10.1021/ma200147f
dc.identifier.doi10.1021/ma200147f
dc.identifier.eissn1520-5835
dc.identifier.endpage2535
dc.identifier.issn0024-9297
dc.identifier.issue8
dc.identifier.startpage2531
dc.identifier.urihttps://hdl.handle.net/20.500.14981/51149
dc.identifier.volume44
dc.identifier.wos000289593200019
dc.language.isoeng
dc.publisherAMER CHEMICAL SOC
dc.relation.ispartofMACROMOLECULES
dc.subjectCHAIN THIOXANTHONE
dc.subjectSINGLET OXYGEN
dc.subjectPolymer Science
dc.titleMechanism of Photoinitiated Free Radical Polymerization by Thioxanthone-Anthracene in the Presence of Air
dc.typeArticle
dspace.entity.typePublication
local.import.sourceWOS

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