Design and thermal profiling of ethyl carbazole-based poly(phenoxy-imine)s: synthesis and characterization

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dc.contributor.authorKaya, Ismet
dc.contributor.authorYilmaz, Mehmet Hakan
dc.contributor.authorKolcu, Feyza
dc.date.accessioned2026-02-03T12:03:06Z
dc.date.available2026-02-03T12:03:06Z
dc.date.issued2025
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractA series of Schiff base monomers were synthesized via the condensation of 3-amino-9-ethylcarbazole with various aldehydes, including 3-hydroxybenzaldehyde (3-HBA), 4-hydroxybenzaldehyde (4-HBA), 2-hydroxy-1-naphthaldehyde (2-HNA), and ortho-vanillin. These monomers were subsequently polymerized through oxidative polycondensation using NaOCl as the oxidant to yield corresponding poly(phenoxy-imine)s, namely Poly(3ECIMP), Poly(4ECIMP), Poly(ECIMN), and Poly(ECIMMP). The chemical structures of the synthesized compounds were confirmed using FTIR, UV-Vis, and both 1H and 13C NMR spectroscopy. Thermal characterization using TG-DTA and DSC demonstrated that the synthesized polymers possess excellent thermal stability, as evidenced by their glass transition temperatures between 145 and 161 degrees C and char yields reaching up to 38.22% at 1000 degrees C. Furthermore, limiting oxygen index values exceeding 28% indicate that these materials exhibit self-extinguishing behavior. Photoluminescence studies conducted in DMF demonstrated intense fluorescence, particularly for Poly(ECIMN), which exhibited yellow-orange emission upon excitation at 502 nm due to the presence of naphthalene moieties that enhance pi-electron delocalization. Optical and electrochemical band gap analyses indicated significantly reduced Eg values for the polymers compared to their monomers, with Poly(ECIMN) showing the lowest band gap of 2.39 eV. Cyclic voltammetry results aligned with optical measurements, confirming improved charge-transfer characteristics in the conjugated polymer backbone. Surface morphology assessed by FE-SEM revealed porous structures, suggesting applicability in gas adsorption or catalytic systems. Size exclusion chromatography confirmed the formation of high molecular weight polymers with narrow polydispersity indices. Collectively, the unique combination of thermal durability, photophysical responsiveness, and structural robustness highlights the potential of these ethyl carbazole-based poly(phenoxy-imine)s in applications spanning optoelectronics, thermal protection, and fluorescence-based sensing.
dc.identifier.doi10.1007/s00289-025-05932-y
dc.identifier.endpage10165
dc.identifier.issn0170-0839
dc.identifier.issn1436-2449
dc.identifier.issue15
dc.identifier.scopus2-s2.0-105011161674
dc.identifier.scopusqualityQ1
dc.identifier.startpage10139
dc.identifier.urihttps://doi.org/10.1007/s00289-025-05932-y
dc.identifier.urihttps://hdl.handle.net/20.500.12428/34975
dc.identifier.volume82
dc.identifier.wosWOS:001532963800001
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherSpringer
dc.relation.ispartofPolymer Bulletin
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WOS_20260130
dc.subjectOxidative polycondensation
dc.subjectPoly(phenoxy-imine)s
dc.subjectThermal properties
dc.subjectPhotoluminescence
dc.subjectLimiting oxygen index
dc.titleDesign and thermal profiling of ethyl carbazole-based poly(phenoxy-imine)s: synthesis and characterization
dc.typeArticle

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