Steady state fluorescence technique for studying phase transitions in PAAm-PNIPA mixture

dc.contributor.authorEvingür, Gülşen Akın
dc.contributor.authorAktaş, Demet Kaya
dc.contributor.authorPekcan, Önder
dc.date.accessioned2019-06-27T08:05:53Z
dc.date.available2019-06-27T08:05:53Z
dc.date.issued2009
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Biyoinformatik ve Genetik Bölümüen_US
dc.description.abstractThe steady state fluorescence (SSF) technique was used to study the sol-gel phase transition during free radical crosslinking copolymerisation of various amounts of acrylamide (AAm) and N-isopropylacrylamide (NIPA) mixtures. NN'-methylenebis (acrylamide) (BIS) and ammonium persulfate (APS) were used as crosslinker and an initiator respectively. Pyranine (8-hydroxypyrene-1 3 6-trisulfonic acid trisodium salt HPTS) was added as a fluoroprobe for monitoring the polymerisation. It was observed that pyranine molecules bind to AAm and NIPA chains upon the initiation of the polymerisation thus the fluorescence spectra of the bonded pyranines shift to the shorter wavelengths. Fluorescence spectra from the bonded pyranines allowed us 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. Observations around the gel point of PAAm-PNIPA mixtures show that the gel fraction exponent obeyed the percolation result.en_US]
dc.identifier.citation10
dc.identifier.doi10.1080/01411590802296294en_US
dc.identifier.endpage65
dc.identifier.issn0141-1594en_US
dc.identifier.issn0141-1594
dc.identifier.issue1
dc.identifier.scopus2-s2.0-61449256546en_US
dc.identifier.scopusqualityN/A
dc.identifier.startpage53en_US
dc.identifier.urihttps://hdl.handle.net/20.500.12469/1129
dc.identifier.urihttps://doi.org/10.1080/01411590802296294
dc.identifier.volume82en_US
dc.identifier.wosWOS:000262436300006en_US
dc.identifier.wosqualityN/A
dc.institutionauthorPekcan, Önderen_US
dc.language.isoenen_US
dc.publisherTaylor & Francisen_US
dc.relation.journalPhase Transitionsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectAcrylamide-NIPAen_US
dc.subjectMixtureen_US
dc.subjectHydrogelen_US
dc.subjectPercolationen_US
dc.subjectCritical phenomenaen_US
dc.subjectFluorescenceen_US
dc.titleSteady state fluorescence technique for studying phase transitions in PAAm-PNIPA mixtureen_US
dc.typeArticleen_US
dspace.entity.typePublication

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