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Photophysical and Thermal Properties of Polyazomethines Containing Various Flexible Units
İsmet Kaya,Ali Avcı,Kevser Temizkan 한국고분자학회 2017 Macromolecular Research Vol.25 No.1
In this study, the poly(azomethine-ether-urethane), poly(azomethine-ester) and poly(azomethine-epoxyether) compounds were prepared to investigate effect of various flexible units on some physical properties like thermal stability and photophysical properties. Structural characterizations were made by FTIR, 1H NMR, 13C NMR, and UV-Vis analyses. The molecular weight distributions of polymers were performed by gel permeation chromatography (GPC) measurement. The chemical and physical properties of polymers were examined by thermogravimetry (TG), differential scanning calorimetry (DSC), photoluminescence (PL), dynamic mechanical analysis (DMA), scanning electron microscope (SEM) and atomic force microscopy (AFM) techniques. As a result, the outstanding properties related to the photoluminescence and thermal measurements of the polymers were obtained. Therefore, the presented photoluminescent polymers could be used in thermally stable photo-functional materials.
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İsmet Kaya,Feyza Kolcu,Gizem Tasvir Arıcı,Ezgi Çölekoğlu 한국고분자학회 2019 Macromolecular Research Vol.27 No.2
In this study, poly(azomethine)s with cresol and pyrrole as side chain units were synthesized in three steps. In the first step; symmetrical dialdehyde bromide (DAB), in the second step; symmetrical derivatives (DAB-1 and DAB-2) of DAB using p-cresol and pyrrole, respectively, and in the third step; poly(azomethinecresol) (P-1) and poly(azomethine-pyrrole) (P-2) were obtained via condensation reaction. Structures of all synthesized compounds were confirmed by FT-IR, UV-Vis, and 1H NMR spectroscopic analyses. Photophysical and electrochemical properties of these compounds were investigated using photoluminescence (PL) and cyclic voltammetry (CV) measurements, respectively. Based on photoluminescence analysis, the multicolor properties of DAB-2, P-1 and P-2 were observed in DMF solution. Additionally, results of thermal studies of TG-DTA and DSC techniques showed they were thermally stable compounds
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Ismet Kaya,Mehmet Ylldlrlm,Ali Avcl,Musa Kamacl 한국고분자학회 2011 Macromolecular Research Vol.19 No.3
Oligophenol-based poly(azomethine-urethane)s (PAMUs) were newly synthesized in two steps. At the first step, the prepolymers including the phenol and oligophenol based-Schiff bases were prepared by a condensation reaction of o-dianisidine with 4-hydroxybenzaldehyde/3-ethoxy-4-hydroxybenzaldehyde, and the polycondensation reactions of the corresponding Schiff bases in an aqueous alkaline media. At the second step, the PAMUs were obtained by copolymerization of the prepolymers with toluene-2,4-diisocyanate (TDI) under an argon atmosphere. The structures of the obtained compounds were confirmed by FTIR, UV-vis, ^1H NMR, and ^13C NMR, and size exclusion chromatography (SEC) techniques. The synthesized compounds were also characterized by TG-DTA and DSC analyses. Thermal decomposition steps at various temperatures were clarified by FTIR analyses of the degraded products. The physical changes to the synthesized PAMUs after exposing them to the thermal degradation steps are displayed.
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İsmet Kaya,Mehmet Gökpınar,Musa Kamacı 한국고분자학회 2017 Macromolecular Research Vol.25 No.7
In this paper, a series of Schiff bases and their polyazomethine derivatives were synthesized via condensation and oxidative polycondensation reactions of 4- aminophenol with 4-isopropylbenzaldehyde or 4-t-butylbenzaldehyde. Polymerization reaction conditions for polymerization yield of polyazomethines were investigated by changing some experimental parameters such as time and temperature using different oxidants like alkaline NaOCl (30%) and air. The structural characterizations of Schiff bases and polymers were performed using FT-IR, 1H NMR, 13C NMR and SEC techniques. Photophysical properties were studied UV-vis and photoluminescence spectroscopies. Electrochemical properties were also investigated cyclic voltammetry (CV) and electrochemical band gaps determined in the range 1.73 to 2.63 eV. Thermal properties of the compounds were investigated using TG-DTA and DSC techniques and char residue at 1000 oC determined between 3-6% and 39-34% for Schiff bases and polyazomethines, respectively. Moreover, conductivity measurements were done using four-point probe technique at both doped with iodine vapor and un-doped state.
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İsmet Kaya,Ali Avcı,Kevser Temizkan 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4
New poly(azomethine-urethane)s (PAMU)s were prepared to investigate the effects of different four diisocyanateson some physical properties such as thermal stability, optical and electrochemical properties. First, the fluoreneSchiff base was synthesized as in the literature. Then, this Schiff base was converted to poly(azomethine-urethane)susing diisocyanates (2,4-toluenediisocyanate, 1,4-phenylene diisocyanate, methylene-di-p-phenyl-diisocyanate, andhexamethylene-diisocyanate) via condensation reaction. Second, the structures of PAMUs were confirmed by FT-IR,NMR, and UV-Vis spectral analyses. Cyclic voltammetry (CV) was used to determine the electrochemical oxidationreductioncharacteristics of (PAMU)s. The CV results of PAMUs compounds showed to have an electrochemical bandgap below such as 2.0 eV. The PAMUs were characterized by TGA, DSC, SEM, SEC and AFM techniques. TGA analysisresults of compounds showed considerable increasing of the thermal stability of polymers, because of finding ofazomethine bond in the main chain.
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Musa Kamacı,Ismet Kaya 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
In this paper, Schiff base (PAH) and its poly(azomethine-urethane) derivative (P-PAH) were synthesizedand high-quality film sensor of these compounds could be easily fabricated on transparent polyestersurface through dip-coating technique. Then, these films were used as fluorescence probes for thedetection of metal ions in aqueous solutions. Photophysical properties of fluorescent films wereinvestigated using fluorescence and UV–vis spectrometers. Fluorescence properties of probes wereinvestigated in the presence of a series of differentmetal ions and the results showed thatmonomer andpolymer films have a highly sensitive and selective response to Fe3+ ion in deionized water. Moreover,fluorescence measurements showed that the prepared fluorescent films have in the range 143–180 nmStokes shift value. Also, contact angles of film probes were investigated and contact angles of PAH and PPAHprobes measured as 85 1 and 95 2o, respectively.
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