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dc.contributor.authorEvingür, Gülşen Akin
dc.contributor.authorPekcan, Önder
dc.date.accessioned2019-06-27T08:04:32Z
dc.date.available2019-06-27T08:04:32Z
dc.date.issued2012
dc.identifier.issn0170-0839
dc.identifier.urihttps://hdl.handle.net/20.500.12469/954
dc.identifier.urihttps://doi.org/10.1007/s00289-011-0625-6
dc.description.abstractTemperature sensitive copolymers were prepared by free radical crosslinking copolymerization in aqueous solution with different molar percentage of N-isopropylacrylamide (NIPA) and acrylamide (AAm) monomers. NN'-methylenebis (acrylamide) (BIS) and ammonium persulfate (APS) were used as a crosslinker and an initiator respectively. The steady-state fluorescence (SSF) technique was used to determine the low critical phase transition temperature (LCST) for PAAm-NIPA copolymers. Swelling experiments were performed in water at various temperatures by real time monitoring of pyranine (Py) fluorescence intensity I which decreased as swelling proceeded. The Stern-Volmer equation is modified for low quenching efficiencies to interpret the behavior of pyranine intensity during the swelling of PAAm-NIPA copolymers. The Li-Tanaka equation was used to determine the swelling time constants tau (1) and the cooperative diffusion coefficients D (0) from fluorescence intensity weight and volume variations of the copolymers at various temperatures. It was observed that tau (1) first increased up to LCST and then decreased
dc.description.abstractnaturally D (0) decreased up to LCST and then increased upon increasing temperature. It was understood that (LCST) increases as PAAm contents increase in the PAAm-NIPA copolymers.
dc.language.isoEnglish
dc.publisherSpringer
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectSwelling
dc.subjectFluorescence
dc.subjectNIPA
dc.subjectPolyacrylamide
dc.subjectCopolymer
dc.subjectLCST
dc.titleEffect of LCST on the swelling of PAAm-NIPA copolymers: a fluorescence study
dc.typeArticle
dc.identifier.startpage223
dc.identifier.endpage238
dc.relation.journalPolymer Bulletin
dc.identifier.issue1
dc.identifier.volume68
dc.identifier.wosWOS:000297738700016
dc.identifier.doi10.1007/s00289-011-0625-6
dc.contributor.khasauthorPekcan, Önder


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