Phase Transitions in Pure and Hybrid Hydrogels: A Fluorescence Study

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.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Biyoinformatik ve Genetik Bölümüen_US
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.en_US]
dc.identifier.citation0
dc.identifier.doi10.1002/masy.200950720en_US
dc.identifier.endpage159
dc.identifier.issn1022-1360en_US
dc.identifier.issn1521-3900en_US
dc.identifier.issn1022-1360
dc.identifier.issn1521-3900
dc.identifier.scopus2-s2.0-68349084574en_US
dc.identifier.scopusqualityQ3
dc.identifier.startpage150en_US
dc.identifier.urihttps://hdl.handle.net/20.500.12469/1123
dc.identifier.urihttps://doi.org/10.1002/masy.200950720
dc.identifier.volume281en_US
dc.identifier.wosWOS:000268989100021en_US
dc.identifier.wosqualityN/A
dc.institutionauthorPekcan, Önderen_US
dc.language.isoenen_US
dc.publisherWileyen_US
dc.relation.journalMacromolecular Symposiaen_US
dc.relation.publicationcategoryKonferans Öğesi - Uluslararası - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectCritical phenomenaen_US
dc.subjectFluorescenceen_US
dc.subjectHybriden_US
dc.subjectHydrogelsen_US
dc.subjectPercolationen_US
dc.titlePhase Transitions in Pure and Hybrid Hydrogels: A Fluorescence Studyen_US
dc.typeConference Objecten_US
dspace.entity.typePublication

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