Effect of LCST on the swelling of PAAm-NIPA copolymers: a fluorescence study

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.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Biyoinformatik ve Genetik Bölümüen_US
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 decreaseden_US]
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.en_US]
dc.identifier.citation5
dc.identifier.doi10.1007/s00289-011-0625-6en_US
dc.identifier.endpage238
dc.identifier.issn0170-0839en_US
dc.identifier.issn0170-0839
dc.identifier.issue1
dc.identifier.scopus2-s2.0-84856333875en_US
dc.identifier.scopusqualityN/A
dc.identifier.startpage223en_US
dc.identifier.urihttps://hdl.handle.net/20.500.12469/954
dc.identifier.urihttps://doi.org/10.1007/s00289-011-0625-6
dc.identifier.volume68en_US
dc.identifier.wosWOS:000297738700016en_US
dc.identifier.wosqualityN/A
dc.institutionauthorPekcan, Önderen_US
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.relation.journalPolymer Bulletinen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectSwellingen_US
dc.subjectFluorescenceen_US
dc.subjectNIPAen_US
dc.subjectPolyacrylamideen_US
dc.subjectCopolymeren_US
dc.subjectLCSTen_US
dc.titleEffect of LCST on the swelling of PAAm-NIPA copolymers: a fluorescence studyen_US
dc.typeArticleen_US
dspace.entity.typePublication

Files

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
Effect of LCST on the swelling of PAAm-NIPA copolymers a fluorescence study.pdf
Size:
357.28 KB
Format:
Adobe Portable Document Format
Description: