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Percolation of glassy regions during photopolymerization of epoxy acrylate in DMF

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dc.contributor.authorDogruyol, Z.
dc.contributor.authorArsu, N.
dc.contributor.authorDogruyol, S. Keskin
dc.contributor.authorPekcan, O.
dc.contributor.institutionauthorARSU, Nergis
dc.date.accessioned2026-06-27T13:38:04Z
dc.date.issued2015
dc.description.abstractThe gelation of epoxy acrylate (EA) 80% and tripropyleneglycol diacrylate (TPGDA) 20% was studied through the use of photo-differential scanning calorimetric (photo-DSC) technique in the presence of a thioxanthone based initiator. Photo-induced polymerization reactions were performed under identical conditions of temperature, initiator concentration and UV light intensity in various N,N-dimethylformamide (DMF) contents. Photo-DSC technique allowed us to monitor the gelation without disturbing the system mechanically, and to test the universality of the gelation as a function of DMF content. During gelation, it was observed that all conversion curves presented useful sigmoidal behavior which was predicted by employing a percolation model. Observations around the glass transition point, t(g), revealed that gel fraction exponent beta obeyed the percolation picture. A significant solvent effect on the photopolymerization kinetics of EA/TPGDA was observed with changes in DMF content. DMF is used as solvent, which acts as a diluent and proton donor during photogelation. (C) 2014 Elsevier B.V. All rights reserved.en
dc.description.sponsorshipYildiz Technical University, TUBITAK
dc.description.sponsorshipTurkish State Planning Organization (DPT)
dc.description.urihttps://doi.org/10.1016/j.porgcoat.2014.11.010
dc.identifier.doi10.1016/j.porgcoat.2014.11.010
dc.identifier.endpage64
dc.identifier.issn0300-9440
dc.identifier.startpage59
dc.identifier.urihttps://hdl.handle.net/20.500.14981/53975
dc.identifier.volume80
dc.identifier.wos000349511900008
dc.language.isoeng
dc.publisherELSEVIER SCIENCE SA
dc.relation.ispartofPROGRESS IN ORGANIC COATINGS
dc.subjectPhotopolymerization
dc.subjectGlass transition point
dc.subjectPhotoinitiator
dc.subjectSolvent concentration
dc.subjectPhoto-DSC
dc.subjectFREE-RADICAL POLYMERIZATION
dc.subjectPROPAGATION RATE COEFFICIENTS
dc.subjectMOLECULAR-SIZE DISTRIBUTION
dc.subjectMETHYL-METHACRYLATE
dc.subjectCRITICAL EXPONENTS
dc.subjectPHOTOINITIATED GELATION
dc.subjectFLUORESCENCE PROBE
dc.subjectTRANSITION
dc.subjectKINETICS
dc.subjectSOLVENT
dc.subjectChemistry
dc.subjectMaterials Science
dc.titlePercolation of glassy regions during photopolymerization of epoxy acrylate in DMF
dc.typeArticle
dspace.entity.typePublication
local.import.sourceWOS

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