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dc.contributor.authorAktas, Demet Kaya
dc.contributor.authorEvingür, Gülşen Akin
dc.contributor.authorPekcan, Önder
dc.date.accessioned2019-06-27T08:05:50Z
dc.date.available2019-06-27T08:05:50Z
dc.date.issued2009
dc.identifier.issn1022-1360
dc.identifier.issn1521-3900
dc.identifier.urihttps://hdl.handle.net/20.500.12469/1123
dc.identifier.urihttps://doi.org/10.1002/masy.200950720
dc.description.abstractRecent observations on phase transitions around the critical point showed that the critical exponents differed drastically from percolation results and classical results for pure hydrogel systems depending on monomer concentration. in addition to pure hydrogels the sol-gel phase transition during radical crosslinking copolymerization of acrylamide (AAm) and N-isopropylacrylamide (NIPA) hybrid was studied by using the steady state fluorescence (SSF) technique. NN'-methylenebis(acrylamide) (BIS) and ammonium persulfate (APS) were used as crosslinker and initiator respectively. Pyranine (trisodium 8-hydroxypyrene-136-trisulfonate acid HPTS) was added as a fluoroprobe for monitoring the polymerization. It was observed that pyranine binds to AAm and NIPA chains on the initiation of the polymerization thus the fluorescence spectra of the bonded pyranines shift to shorter wavelengths. Fluorescence spectra of the bonded pyranines allowed to monitor the sol-gel phase transition without disturbing the system mechanically and to test the universality of the sol-gel transition as a function of polymer concentration ratios. The observations around the gel point of PAAm-PNIPA hybrid show that the gel fraction exponent beta obeyed the percolation result.
dc.language.isoEnglish
dc.publisherWiley
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectCritical phenomena
dc.subjectFluorescence
dc.subjectHybrid
dc.subjectHydrogels
dc.subjectPercolation
dc.titlePhase Transitions in Pure and Hybrid Hydrogels: A Fluorescence Study
dc.typeProceedings Paper
dc.identifier.startpage150
dc.identifier.endpage159
dc.relation.journalMacromolecular Symposia
dc.identifier.volume281
dc.identifier.wosWOS:000268989100021
dc.identifier.doi10.1002/masy.200950720
dc.contributor.khasauthorPekcan, Önder


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