Synthesis and characterization of graft copolymers of melamine: Thermal stability, electrical conductivity, and optical properties

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dc.authoridKaya, İsmet / 0000-0002-9813-2962
dc.authoridYıldırım, Mehmet / 0000-0001-9948-9106
dc.contributor.authorKaya, İsmet
dc.contributor.authorYıldırım, Mehmet
dc.date.accessioned2025-01-27T20:48:00Z
dc.date.available2025-01-27T20:48:00Z
dc.date.issued2009
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractin this study, novel three Schiff bases of melamine were synthesized via condensation reaction of melamine with salicylaldehyde, 3-hydroxybenzaldehyde, and 4-hydroxybenzaldehyde namely N,N',N '',-tris[(2-hydroxyphenyl)methylene]-1,3,5-triazine-2,4,6-triamine (2-HPMTT), N,N',N ''-tris[(3-hydroxyphenyl) methylene]-1,3,5-triazine-2,4,6-triamine (3-HPMTT), N,N',N ''-tris[(4-hydroxyphenyl)methylene]-1,3,5-triazine-2,4,6-triamine (4-HPMTT), respectively. Then, oligo/polyphenol derivatives of these Schiff bases were obtained by grafting melamine onto oligosalicylaldehyde (OSA), oligo-3-hydroxybenzaldehyde, and oligo-4-hydroxybenzaldehyde that have generate names of poly-N,N',N ''-tris[(2-hydroxyphenyl)methylene]-1,3,5-triazine-2,4,6-triamine (P-2-HPMTT), poly-N, N',N ''-tris[(3-hydroxyphenyl)methylene]-1,3,5-triazine-2,4,6-triamine (P-3-HPMTT), and oligo-N,N',N ''-tris[ (4-hydroxyphenyl)m ethylene]-1,3,5-triazine-2,4,6-triamine (O-4-HPMTT), respectively. The structures of the synthesized compounds were confirmed by FT-IR, UV-vis, (1)H NMR, and (13)C NMR techniques. The characterization was made by TG-DTA, DSC, size exclusion chromatography (SEC), and solubility tests. Electrical conductivities of the synthesized materials were measured by four-point probe technique using a Keithley 2400 electrometer showing that the synthesized oligo/polyphenols have higher electrical conductivities than the monomeric Schiff bases. Also considerable increases in the conductivities were observed when they were doped with iodine as a doping agent. The order of increase rates of the conductivities were found as follows: 2-HPMTT>P-2-HPMTT>P-3-HPMTT>3-HPMTT>4-HPMTT >P-4-HPMTT Additionally, the optical band gaps (E.) were calculated by using the absorption spectra and found to be 2.78, 2.17, 3.58, 3.30, 4.03, and 2.82 eV for 2-HPMTT, P-2-HPMTT, 3-HPMTT, P-3-HPMTT, 4-HPMTT, and O-4-HPMTT, respectively. (C) 2009 Elsevier B.V. All rights reserved.
dc.identifier.doi10.1016/j.synthmet.2009.04.019
dc.identifier.endpage1582
dc.identifier.issn0379-6779
dc.identifier.issue15-16
dc.identifier.scopus2-s2.0-67651122917
dc.identifier.scopusqualityQ1
dc.identifier.startpage1572
dc.identifier.urihttps://doi.org/10.1016/j.synthmet.2009.04.019
dc.identifier.urihttps://hdl.handle.net/20.500.12428/25111
dc.identifier.volume159
dc.identifier.wosWOS:000269470200010
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier Science Sa
dc.relation.ispartofSynthetic Metals
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectMelamine
dc.subjectPolyazomethine
dc.subjectOligophenol
dc.subjectGraft copolymer
dc.subjectSchiff base oligomer or polymers
dc.subjectConjugated polymers
dc.subjectThermal analysis
dc.subjectDifferential scanning calorimetry
dc.subjectConductivity and band gap
dc.titleSynthesis and characterization of graft copolymers of melamine: Thermal stability, electrical conductivity, and optical properties
dc.typeArticle

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