Synthesis and characterization of oligo(phenoxy-imine)s of Schiff bases containing phenyl-1,3,5-triazine unit: limit oxygen index values of oligomers
Yükleniyor...
Tarih
2024
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Aromatic compounds containing hydroxyl groups in their structure are converted to oligomer or polymer products from the combination of phenoxy-structured radical units in the presence of oxidants such as O2, H2O2 and NaOCl in alkaline or acidic aqueous media. These macromolecule compounds are used in many fields in industry because they contain both phenyl units and different functional groups in their structures. Since the phenyl units in the main chain give rigidity to the structure, the thermal stabilities of these types of polymers are quite good. Schiff base compounds were obtained as a result of the condensation reaction of 4-hydroxy-3-methoxybenzaldehyde, 2-hydroxybenzaldehyde, 4-hydroxybenzaldehyde, 5-bromsalicylaldehyde and 2-hydroxy-1-naphthaldehyde compounds with 2,4-diamino-6-phenyl-1,3,5-triazine as amine. Oligo(phenoxy-imine)s were synthesized from Schiff bases by oxidative polycondensation in the presence of O2 oxidant in aqueous alkaline medium. The structural characterizations of Schiff bases and oligo(phenoxy-imine)s were performed by FT-IR, 1H-NMR, 13C-NMR and UV-Vis analyses. Electrochemical band gap (Eg '\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$E<^>{\prime}_{g}$$\end{document}) values of monomers and oligomers were calculated from CV measurements. The Eg '\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$E<^>{\prime}_{g}$$\end{document} values of FMD, FMB, FMM, FMF, FMN, OFMD, P-FMB, OFMM, OFMF and OFMN were calculated to be 2.80, 2.63, 2.52, 2.76, 2.12, 2.57, 2.49, 2.44, 2.51 and 2.07 eV, respectively. Limit oxygen index values of OFMD, P-FMB, OFMM, OFMF and OFMN were calculated to be 33.46%, 38.85%, 38.43%, 44.86% and 23.46%, respectively. Also, the molecular weight distributions, glass transition temperature (Tg) and surface images of oligomers were determined from GPC, DSC and SEM measurements, respectively.
Açıklama
Anahtar Kelimeler
Oligo(phenoxy-imine)s, Schiff base, Limit oxygen index, Optical and electrochemical band gaps
Kaynak
Polymer Bulletin
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
Sayı
Künye
Kaya, İ., Cicigül, M.ve Yağmur, H. K. (2024). Synthesis and characterization of oligo(phenoxy-imine)s of Schiff bases containing phenyl-1,3,5-triazine unit: limit oxygen index values of oligomers. Polymer Bulletin, 1-25.
