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- 저자 : İsmet Kaya (검색결과 5 건)
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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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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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Suleyman Culhao?lu,?smet Kaya 한국고분자학회 2015 폴리머 Vol.39 No.2
In this study, we proposed to synthesize thermally stable, soluble and conjugated Schiff base polymer (SbP). For this reason, a specific molecule namely 4,4"-thiodiphenol which has sulfur and oxygen bridge in its structure was used to synthesize bi-functional monomers. Bi-functional amino and carbonyl monomers namely 4,4"-[thio-bis(4,1-phenyleneoxy)] dianiline (DIA) and 4,4"-[thiobis(4,1-phenyleneoxy)]dibenzaldehyde (DIB) were prepared from the elimination reaction of 4,4"-thiodiphenol with 4-iodonitrobenzene and 4-iodobenzaldehyde, respectively. The structures of products were confirmed by elemental analysis, FTIR, <SUP>1</SUP>H NMR and <SUP>13</SUP>C NMR techniques. The molecular weight distribution parameters of SbP were determined by size exclusion chromatography (SEC). The synthesized SbP was characterized by solubility tests, TG-DTA and DSC. Also, conductivity values of SbP and SbP-iodine complex were determined from their solid conductivity measurements. The conductivity measurements of doped and undoped SbP were carried out by Keithley 2400 electrometer at room temperature and atmospheric pressure, which were calculated via fourpoint probe technique. When iodine was used as a doping agent, the conductivity of SbP was observed to be increased. Optical band gap (Eg) of SbP was also calculated by using UV-Vis spectroscopy. It should be stressed that SbP was a semiconductor which had a potential in electronic and optoelectronic applications, with fairly low band gap. SbP was found to be thermally stable up to 300℃. The char of SbP was observed 29.86% at 1000℃.
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