Regioselective synthesis of polygamma (?) acid

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dc.authoridTemizkan Ozdamar, Kevser/0000-0001-7740-3252
dc.contributor.authorDoğan, Fatih
dc.contributor.authorTemizkan, Kevser
dc.contributor.authorKaya, İsmet
dc.date.accessioned2025-01-27T20:49:39Z
dc.date.available2025-01-27T20:49:39Z
dc.date.issued2015
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractThe oxidative polymerization of 6-amino-4-hydroxy-2-naphthalenesulfonic acid in an aqueous alkaline medium leads to the formation of a polygamma (gamma) acid consisting of regioselective 1-4 oxazine rings. Spectral characterizations were performed by NMR, FT-IR, and UV-Vis techniques. The average molecular weight and polydispersity index of the gamma acid polymer (gamma-AP) were found to be 32 000 Da and 1.42, respectively. gamma-AP also presented an uncommon multicolored emission behavior in dimethylsulfoxide (DMSO). When excited at 405, 480, and 532 nm, gamma-AP emitted blue, green and yellow light, respectively. X-ray diffraction (XRD), differential scanning calorimetry (DSC), dynamic mechanical analyses (DMA), and transmission electron microscopy (TEM) illustrated that gamma-AP is composed of semicrystalline nanofiber structures with different lengths between 10-500 nm. The kinetic parameters related to the solid state thermal decomposition of gamma-AP were determined using differential isoconversional methods (Friedman and Kissenger) and integral isoconversional methods (FWO, KAS, Tang, Starink and Bosewell). By using the Tang, KAS, FWO, Starink, Bosewell, Kissenger and Friedman methods, the average values of the activation energies were calculated to be 184.4, 184.4, 185.4, 188.5, 183.6, 179.7 and 187.1 kJ mol(-1), respectively. The master plot curves also suggested a diffusion-type kinetic model for the solid state thermal decomposition stage of gamma-AP.
dc.description.sponsorshipScientific and Technological Research Council of Turkey [KBAG-113Z587]
dc.description.sponsorshipThe authors thank the Scientific and Technological Research Council of Turkey (Project Nu.: KBAG-113Z587) for financial support of this work.
dc.identifier.doi10.1039/c5ra07408h
dc.identifier.endpage53380
dc.identifier.issn2046-2069
dc.identifier.issue66
dc.identifier.scopus2-s2.0-84934915875
dc.identifier.scopusqualityQ1
dc.identifier.startpage53369
dc.identifier.urihttps://doi.org/10.1039/c5ra07408h
dc.identifier.urihttps://hdl.handle.net/20.500.12428/25266
dc.identifier.volume5
dc.identifier.wosWOS:000356801300028
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherRoyal Soc Chemistry
dc.relation.ispartofRsc Advances
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectOxidative Polymerization
dc.subjectThermal-Decomposition
dc.subjectElectrical-Properties
dc.subjectMulticolor Emission
dc.subjectFacile Synthesis
dc.subjectPolyaniline
dc.subjectPolymers
dc.subjectConductivity
dc.subjectDerivatives
dc.subjectFilms
dc.titleRegioselective synthesis of polygamma (?) acid
dc.typeArticle

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