Doğruyol, ZekeriyaPekcan, Mehmet ÖnderArsu, NergisDoğruyol, Sevnur KeskinPekcan, Önder2019-06-272019-06-2720150300-94400300-9440https://hdl.handle.net/20.500.12469/612https://doi.org/10.1016/j.porgcoat.2014.11.010The 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 NN-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.eninfo:eu-repo/semantics/openAccessPhotopolymerizationGlass transition pointPhotoinitiatorSolvent concentrationPhoto-DSCArticle596480WOS:00034951190000810.1016/j.porgcoat.2014.11.0102-s2.0-84920584486Q1Q11