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A novel shape-controlled synthesis of bifunctional organic polymeric nanoparticles
(Elsevier Sci Ltd, 2015) Doğan, Fatih; Temizkan, Kevser; Kaya, İsmet
A novel shape-controlled bifunctional organic nanoparticle was reported using the facile synthesis of self-stabilized monohydroxy amino naphthol nanoparticles. For this purpose, bifunctional monomer was polymerized by NaOCl as oxidant in aqueous alkaline medium at 70 degrees C. These poly-nanoparticles with molecular weight ca. 5000 Da was obtained by template-free oxidative polymerization (OP) process. The structure of polymer was confirmed by NMR, FT-IR, UV-Vis and X-RD measurements. The chemical and physical properties of polymer were determined size exclusion chromatography (SEC), thermogravimetry (TG), differential scanning calorimetry (DSC), cyclic voltammetry (CV), photoluminescence (PL), dynamic light scattering (DLS), scanning electron microscope (SEM), transmission electron microscope (TEM) and conductivity techniques. The SEM analysis of polymer indicated to be had a nanoparticle structure. The reversible redox behavior of the polymer was attributed to its electroactive nature. In addition, the kinetic parameters related to the solid state decomposition of the poly-nanoparticles were calculated by non-isothermal methods based on multiple heating rates. (C) 2015 Elsevier Ltd. All rights reserved.
Ana zincirinde azometin bağı içeren poliesterlerin karakterizasyonu ve termal özellikleri
(Çanakkale Onsekiz Mart Üniversitesi Fen Bilimleri Enstitüsü, 2014) Temizkan, Kevser; Kaya, İsmet
Bu çalışmada, ana zincirinde azometin bağı içeren poliesterler üç farklı seride incelendi. Birinci seride farklı alifatik zincirler, ikinci seride alifatik zincir ve eter köprüleri, üçüncü seride benzen halkası etrafında farklı konumlanmış Schiff bazı ve poliesterler sentezlendi. Sentezlenen Schiff bazlarının ve poliesterlerin yapıları FT-IR, 1H-NMR, 13C-NMR ve UV-Vis teknikleri kullanılarak aydınlatıldı. Elde edilen bileşiklerin fotofiziksel özellikleri UV-Vis ve fotolimünesans ölçümleri ile incelendi. Hazırlanan Schiff bazlarının ve poli(azometin-ester) türevlerinin elektrokimyasal özellikleri döngüsel voltammetri (CV) tekniği kullanılarak aydınlatıldı. Elde edilen bileşiklerin ısısal özellikleri TG-DTA, DMA ve DSC teknikleri kullanılarak aydınlatıldı. Sentezlenen Schiff bazlarının ve ana zincirinde azometin bağı içeren poliesterlerin morfolojik ve topografik özellikleri ise sırasıyla SEM ve AFM teknikleri kullanılarak aydınlatıldı. Poliesterlerin mol kütlesi dağılımları SEC ölçümleriyle belirlendi. Sentezlenen bileşiklerin yapılarındaki farklı alifatik zincir uzunluğuna, eter köprüsü sayısına ve benzen halkası etrafında farklı konumlanmasına bağlı olarak fotofiziksel, elektrokimyasal, ısısal, mekanik, morfolojik ve topografik yapılarındaki farklılıklar araştırıldı.
Ana zincirinde hetero atom içeren imin polimerlerinin sentez ve karakterizasyonu
(Çanakkale Onsekiz Mart Üniversitesi, 2011) Temizkan, Kevser; Kaya, İsmet
Bu çalışmada ana zincirinde hetero atom içeren üç adet polimer ve iki adet Schiff bazı sentezlendi. Polimerlerin sentezi HCl eliminasyonu ile THF çözeltisinde gerçekleştirildi. Bileşikler yaklaşık olarak %60 civarında verimlerle sentezlendi. Sentezlenen Schiff bazlarının ve polimerlerin yapı analizleri, termal özellikleri, floresans özellikleri araştırıldı. Monomer ve polimerlerin yapıları, FT-IR, 1H-NMR, TG ?DTG-DTA, DSC ve DMA yöntemleri ile aydınlatıldı. FT-IR ve 1H-NMR analiz verilerine göre Schiff bazı ve polimerlerin yapılarında -HC=N- (azometin bağı) oluştuğu görüldü. Bileşiklerin floresans ölçümleri derişime bağlı olarak metanolde gerçekleştirildi. Termogravimetrik analiz (TG) değerleri incelendiğinde polimerlerin monomerlerine göre daha kararsız oldukları belirlendi. Bu durum polimer zincirindeki silan ve fosfazen gruplarıyla açıklandı. Çözünürlük testi sonuçlarına göre sentezlenen tüm monomerlerin metanolde çözündüğü görüldü.
Chemical Oxidative Synthesis and Characterization of Poly(8-hydroxyquinoline) Particles
(Taylor & Francis Inc, 2014) Doğan, Fatih; Kaya, İsmet; Temizkan, Kevser
The chemical oxidative polymerization (OP) of 8-hydroxyquinoline (HQ) in an organic medium leaded to the formation of the C-2 and C-4 linking poly (8-hydroxyquinoline) (PHQ). The structure of PHQ was confirmed by UV-Vis, FT-IR, and H-1-NMR. The characterization of polymer was performed by TG-DTA, differential scanning calorimetry, dynamic mechanical analysis, dynamic light scattering, size exclusion chromatography, X-ray diffraction, cyclic voltammetry, atomic force microscope, photoluminescence and solubility tests. The fluorescence spectrum of PHQ exhibited an emission peak at approximately 525nm in DMSO. Accordingly, it was found PHQ emitted green light whereas HQ emitted yellow light in DMSO solvent. Optical band gaps (E-g) of PHQ was calculated to be 3.31eV. The electrical conductivities of iodine doped-PHQ and undoped-PHQ were measured with four-point probe technique. Magnetic particles was prepared by chemical precipitation of mixed Fe(II) and Fe(III) salts and modified with HQ by using an in situ chemical oxidation polymerization method in organic medium.
Fluorescence quantum yields and chromatic properties of poly(azomethine)s containing pyridine ring
(Elsevier, 2020) Temizkan, Kevser; Kaya, İsmet
The poly(azomethine)s containing pyridine ring were synthesized in two stages and analyzed by electrochemical, optical and thermal analysis techniques. Pyridine with centric dialdehyde (DA-Py) and poly(azomethine-pyridine)s (PAZ-Py)s were synthesized by elimination and condensation reactions in organic solvent medium, respectively. The structures of the synthesized dialdehyde and poly(azomethine-pyridine)s were verified by nuclear magnetic resonance spectroscopy (NMR), Fourier-transform infrared spectroscopy (FT-IR) and ultraviolet-visible spectroscopy (UV-Vis) analysis was performed and they were also characterized with cyclic voltammetry (CV), photoluminescence (PL) analysis, thermal analysis (TG-DTA) and Differential Scanning Calorimetric (DSC) analysis. According to thermal analysis, the initial degradation temperature (T-on) and glass transition temperature (T-g) values of PAZ-Py-1, PAZ-Py-2 and PAZ-Py-3 were found to be 126, 185, 139 degrees C and 102, 153 and 125 degrees C, respectively. According to fluorescence analysis, PAZ-Py-1 emitted four different colors of blue, green, orange and red emissions when excited at different wavelengths such as 340, 360, 380, 400, 420, 440 nm; 460, 480 nm; 500 nm; and 580 nm, respectively, in dimethylformamide (DMF) solutions. Also, two different colors were observed when excited at different wavelengths (blue emissions at 280, 300, 320, 340, 360, 380, 400, and 440 nm and orange emissions at 460, 480, 500, 520, 540, and 560 nm) in ethanol (EtOH) solutions. In addition, fluorescence quantum yields of PAZ-Py were found to be 9.0% and 11.0%; and 9.0% and 9.5% when excited at 440 and 460 nm in EtOH solution and when excited at 380 and 400 nm in DMF solutions, respectively.
Fluorescence, thermal and electrochemical properties of poly(azomethine-urethane)s containing sulfone group
(Springer, 2015) Avci, Ali; Temizkan, Kevser; Kaya, İsmet
In this study, the new sulfone group-containing poly(azomethine-urethane)s (PAZUs) were synthesized to investigate the effects various diisocyanates on the thermal, fluorescence, electrochemical and morphological properties. The structures of PAZUs have been confirmed by FT-IR, NMR, and SEC analyses. The electrochemical behaviors of the PAZUs were examined by cyclic voltammetry. Optical properties were investigated by UV-Vis and fluorescence measurements. The PAZUs were further characterized by TGA, DSC, SEM, and AFM techniques. TGA analyses results showed considerable increase in the thermal stability of polyurethanes due to the introduction of azomethine bond in the main chain. Consequently, because of the fine thermal properties the obtained materials can be used to produce thermally stable materials.
Heat resisting and water-soluble chocolate polyesters containing azomethine group
(De Gruyter Open Ltd, 2017) Temizkan, Kevser; Kaya, İsmet
In this study, soluble in water poly(azomethine-ester)s (PAEs) were synthesized via elimination reactions of aromatic dihydroxy compounds containing imine bonding with terephthaloyl chloride. The structures of Schiff bases (SBs) and PAEs containing different aliphatic chains were confirmed by FT-IR, H-1-NMR, C-13-NMR and UV-Vis analyses. Physicochemical properties of the new polymers were characterized. Thermal properties of the compounds were investigated by TGA-DTA, DMA and DSC. According to TGA measurements, the starting degradation temperatures (Ton) of P-1, P-2, P-3, and P-4 poly(azomethine-ester) s were found as 255 degrees C, 232 degrees C, 222 degrees C, and 221 degrees C, respectively. The starting degradation temperatures of the poly(azomethine-ester) s were higher than their Schiff base compounds. According to dynamical mechanical analysis (DMA) measurements, glass transition temperature (T-g) of P-1, P-2, P-3, and P-4 poly(azomethine-ester) s were found as 95 degrees C, 138 degrees C, 140 degrees C, and 145 degrees C, respectively. The morphological and topographic properties of the PAEs containing azomethine linkage in the main chain were investigated by FE-SEM and AFM, respectively. The molecular mass distributions of PAEs were determined by gel permeation chromatography (GPC). Electrochemical (E-g(')) and optical band gap (E-g(opt)) values of the prepared SBs and PAEs were calculated from cyclic voltammetry (CV) and UV-Vis analyses. The electrochemical band gap (E-g') values of P-1, P-2, P-3 and P-4 were found as 2.44 eV, 2.41 eV, 2.39 eV and 2.39 eV, respectively, from the cyclic voltammetry.
Peroxidase/H2O2 catalyzed oxidative oligomerization of 1-aminopyrene
(Taylor & Francis Inc, 2017) Kaya, İsmet; Bilici, Ali; Tezel, Ruhiye Nilay; Temizkan, Kevser; Doğan, Fatih
A new florescent oligo(aminopyrene) (OAP) was successfully synthesized by enzymatic approach. For this, H2O2 and Horse Radish peroxidase (HRP) were used as catalyst and oxidant, respectively. The structures of monomer and oxidation product were confirmed by NMR, FT-IR and UV-Vis measurements. The oxidation product was characterized by gel permeation chromatography (GPC), thermogravimetry (TG), differential scanning calorimetry (DSC), cyclic voltammetry (CV), photoluminescence (PL) and scanning electron microscopy (SEM) analyses. OAP was soluble in a wide range of organic solvents. UV-Vis spectrum of the OAP showed a dramatic red shift compared to that of the monomer. The optical and electrochemical band gaps of OAP were found to be 1.65 and 1.56 eV, respectively. OAP emitted turquoise color in THF and green color in toluene. SEM observations indicated the presence of a heterogeneous cauliflower like morphology.
Photophysical and Thermal Properties of Polyazomethines Containing Various Flexible Units
(Springer, 2017) Kaya, İsmet; Avci, Ali; Temizkan, Kevser
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, H-1 NMR, C-13 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.
Regioselective synthesis of polygamma (?) acid
(Royal Soc Chemistry, 2015) Doğan, Fatih; Temizkan, Kevser; Kaya, İsmet
The oxidative polymerization of 6-amino-4-hydroxy-2-naphthalenesulfonic acid in an aqueous alkaline medium leads to the formation of a polygamma (gamma) acid consisting of regioselective 1-4 oxazine rings. Spectral characterizations were performed by NMR, FT-IR, and UV-Vis techniques. The average molecular weight and polydispersity index of the gamma acid polymer (gamma-AP) were found to be 32 000 Da and 1.42, respectively. gamma-AP also presented an uncommon multicolored emission behavior in dimethylsulfoxide (DMSO). When excited at 405, 480, and 532 nm, gamma-AP emitted blue, green and yellow light, respectively. X-ray diffraction (XRD), differential scanning calorimetry (DSC), dynamic mechanical analyses (DMA), and transmission electron microscopy (TEM) illustrated that gamma-AP is composed of semicrystalline nanofiber structures with different lengths between 10-500 nm. The kinetic parameters related to the solid state thermal decomposition of gamma-AP were determined using differential isoconversional methods (Friedman and Kissenger) and integral isoconversional methods (FWO, KAS, Tang, Starink and Bosewell). By using the Tang, KAS, FWO, Starink, Bosewell, Kissenger and Friedman methods, the average values of the activation energies were calculated to be 184.4, 184.4, 185.4, 188.5, 183.6, 179.7 and 187.1 kJ mol(-1), respectively. The master plot curves also suggested a diffusion-type kinetic model for the solid state thermal decomposition stage of gamma-AP.
Synthesis and characterization of a new dyestuff polymer soluble in alkaline aqueous media
(Springer, 2013) Kaya, İsmet; Aydın, Aysel; Temizkan, Kevser
Novel dyestuff polymers were successfully obtained through oxidative polymerization technique. The synthesized Schiff base and its polymer were soluble in alkaline aqueous medium and they have various colors in different solutions. Also, it can be said that the synthesized compounds are suitable as coloring agent (dyestuff) for textile applications. Fluorescence properties of the compounds were determined in DMF with different concentrations (mg/L). Poly-tris(4-aminophenyl)methanol (P-TAPM) has quite high emission and excitation intensity values. Optical and electrochemical band gaps of the polymers were lower than those of the monomers indicating the more conjugated structure of the polymers. The oxidized states of the novel dyestuff compounds were examined by cyclic voltammetry (CV) technique. The solid state conductivity measurements showed that the synthesized polymers were semiconductors when exposed to the iodine vapour their conductivities could be increased. P-TAPM had the highest undoped conductivity. Thermal characterizations of the synthesized compounds were carried out by TG-DTA and DSC methods.
Synthesis and characterization of aromatic and aliphatic ether bridged polymers containing carbazole moieties
(Elsevier, 2013) Kaya, İsmet; Temizkan, Kevser; Aydın, Aysel
In this study, the polymers were synthesized ether bridged containing carbazole moieties via HBr elimination. Also, these polymers include the aliphatic chains at the different lengths and aromatic groups in their structures. However, the polymers were characterized by FT-IR, NMR and UV-vis spectroscopy, and their thermal stabilities were determined via TGA measurements. Fluorescence measurements were performed using N,N'-dimethyl formamide solutions and also, the optimization of the concentrations to obtain maximal emission intensity was investigated in N,N'-dimethyl formamide. The morphologic properties of the polymers were investigated at different particle sizes by using Scanning Electron Microscopy (SEM). Additionally, the number average molecular weight (M-n), weight average molecular weight (M-w) and polydispersity index (PDI) values of the polymers were determined by size exclusion chromatography (SEC) technique. Resultantly, the remarkable properties related to the fluorescence and thermal measurements of the polymers were obtained. Therefore, these polymers could be used in various application fields because of the fluorescent and thermal properties. (C) 2013 Elsevier B.V. All rights reserved.
Synthesis and characterization of ether bridged polymers and their fluorescent, thermal, conductivity, optical and electrochemical properties
(Elsevier Science Sa, 2013) Kaya, İsmet; Temizkan, Kevser; Aydın, Aysel
This paper describes the synthesis of novel ether bridged polymers containing carbazole units via HBr elimination. Also, these polymers include the ether bridged aliphatic chains at different lengths in their structures. The synthesized polymers were characterized by FT-IR, NMR and UV-Vis spectroscopy, and their thermal stabilities were determined by TGA measurements. Additionally, the oxidation peak potentials of compounds were demonstrated using cyclic voltammetry method. Fluorescence measurements were performed using dimethylformamide solution, and the optimization of concentrations to obtain the maximal emission intensity was also investigated in dimethylformamide solution. The morphologic properties of the polymers were obtained by using scanning electron microscopy at different amplifications. Moreover, the number average molecular weight, weight average molecular weight and polydispersity index values of polymers were determined by size exclusion chromatography technique. As a result, some remarkable properties related to the fluorescence and thermal measurements of the polymers were obtained. Because of the fluorescence and thermal properties of these polymers, they could be used in various application fields, such as fluorescence sensors and space crafts. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.
Synthesis of thermally stable and low band gap poly(azomethine-urethane)s containing fluorene unit in the backbone
(Korean Institute Chemical Engineers, 2015) Kaya, İsmet; Avci, Ali; Temizkan, Kevser
New poly(azomethine-urethane)s (PAMU)s were prepared to investigate the effects of different four diisocyanates on some physical properties such as thermal stability, optical and electrochemical properties. First, the fluorene Schiff base was synthesized as in the literature. Then, this Schiff base was converted to poly(azomethine-urethane)s using diisocyanates (2,4-toluenediisocyanate, 1,4-phenylene diisocyanate, methylene-di-p-phenyl-diisocyanate, and hexamethylene-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 oxidationreduction characteristics of (PAMU)s. The CV results of PAMUs compounds showed to have an electrochemical band gap below such as 2.0 eV. The PAMUs were characterized by TGA, DSC, SEM, SEC and AFM techniques. TGA analysis results of compounds showed considerable increasing of the thermal stability of polymers, because of finding of azomethine bond in the main chain.
Synthesis route to regioselectively functionalized bifunctional polyarene
(Wiley, 2015) Doğan, Fatih; Kaya, İsmet; Temizkan, Kevser
We report the regioselective oxidative synthesis of polyaminonaphthol sulfonic acid (PANSA) particles and firstly obtained nanoparticles with molecular weight of ca 23200gmol(-1) using a template-free polymerization process in which NaOCl was used as an oxidant in aqueous basic medium. Nanoparticles were characterized using NMR, Fourier transform infrared and UV-visible spectroscopies, gel permeation chromatography, thermogravimetry (TG), differential scanning calorimetry (DSC), cyclic voltammetry, photoluminescence (PL), dynamic light scattering, X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and conductivity techniques. SEM and TEM analyses showed that the nanoparticles had a self-stabilizing structure interconnecting with micro-channels. PANSA also exhibited reversible redox behaviour due to its electroactive nature. Nanoparticles display a slight hypsochromic shift and hyperchromic effect with higher intensity in PL spectra and also emitted an intense white light in dimethylsulfoxide. In addition, the thermal stability of PANSA was investigated using TG and DSC techniques. Finally, the kinetic parameters related to the solid-state thermal decomposition of PANSA were calculated from non-isothermal methods based on multiple heating rates. (c) 2015 Society of Chemical Industry
Synthesis, characterization and fluorescence properties of azomethine polymer containing quinoline unit
(Springer, 2018) Kaya, İsmet; Er, Gulnihal; Temizkan, Kevser
In this study, synthesis, characterization and photophysical properties of the quinoline and azomethine derived polymers were described with ether linkages. Synthesis procedure was conducted in three steps; the first step, dialdehyde monomer, the second step poly(azomethine) (PA), and the third step poly(azomethine-quinoline) (PAQ) polymers were obtained with elimination and condensation reactions. The structures of synthesized compounds were confirmed with FT-IR, UV-Vis and H-1-C-13-NMR spectra. Electrochemical and photophysical behaviors were interpreted with cyclic voltammetry and photoluminescence data. In addition, thermal properties of compounds were obtained by TG and DSC techniques. Surface images of polymers were photographed with scanning electron microscope (SEM). Electrochemical band gaps (E'(g1)) of PA and PAQ were calculated as 2.19, 1.83 eV, respectively. The starting degradation temperatures of PA and PAQ were found as 126 and 184 A degrees C, respectively.
Synthesis, Characterization and Fluorescence Quantum Yields of Thermally Resisted Shinning Polymers Containing Thiophene and Azomethine Units
(Springer/Plenum Publishers, 2019) Temizkan, Kevser; Kaya, İsmet
Poly(azomethine)s containing thiophene with bridges pyridine, sulphur and oxygen were synthesized in two steps. Before, thiophene centric dialdehyde (DIAL-Th) compound was synthesized via elimination reaction of 4-hydroxy benzaldehyde with thiophene bromide. Then, poly(azomethine)s containing thiophene (PAZ-Th) unit were synthesized from condensation reactions of DIAL-Th with pyridine-3,5-diamine, 4,4 '-thiodianiline and 4,4 '-oxydianiline. The obtained dialdehyde and poly(azomethine- thiophene)s were ratified by fourier-transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-Vis), hydrogen and carbon nuclear magnetic resonance spectroscopy (H-1-C-13-NMR) measurements. The some properties of poly(azomethine-thiophene)s were investigated such as optic, electronic, surface and thermal. Electrochemical and fluorescence properties of compounds were made by cyclic voltammetry (CV) and fluorescence analysis, respectively. According to fluorescence measurement, PAZ-Th-1 was interestingly demonstrated five different colors in DMF solution. Blue, green, yellow, orange and red were observed at 420, 440, 480, 500 and 520nm, respectively, in this solution. The fluorescence quantum yields of PAZ-Th-1 were found to be 4.0, 15.0, 18.0, 6.4 and 6.2% at 420, 440, 480, 500 and 520nm, respectively. According to thermogravimetric (TG) and differential scanning calorimetry (DSC) analyses, T-onset and glass transition temperature of PAZ-Th-1, PAZ-Th-2 and PAZ-Th-3 were found as 256, 248, 224 degrees C and 162, 176, 137 degrees C, respectively. Also, surface analyses of synthesized poly(azomethine-thiophene)s were photographed by scanning electron microscope (SEM) at room temperature.
Synthesis, characterization and quantum yields of multichromic poly(azomethine)s containing carbazole unit
(Elsevier, 2020) Kaya, İsmet; Kilavuz, Esra; Temizkan, Kevser
Poly(azomethine)s containing phosphor, silane and carbazole were synthesized with multiple stage and examined through different photophysical, electrochemical, and thermal behaviours. Following substances were synthesized as an initial step: N-hexyl-carbazole (CH) and N-hexyl-carbazolaldehyde (CHDA), via elimination reaction in argon media and N-hexyl-carbazole azomethine (CHA) via condensation reaction of CHDA with 4-aminophenol also poly(azomethine)s (P-Si-CHA, P-P-CHA) containing silane and phosphor via elimination reaction. The structures of synthesized compounds were confirmed by Fourier-transform infrared spectroscopy (FT-IR), Ultraviolet-visible spectroscopy (UV-Vis) and nuclear magnetic resonance spectroscopy (NMR). Electrochemical properties of compounds were examined with cyclic voltammetry (CV) technique. Fluorescence measurements were utilized to investigate the photochemical behaviors by photoluminescence (PL) analysis. CHA compound surprisingly presented multicolor emission behavior (when excited at 370, 420, 480, 540 and 580 nm, the solution emitted blue, green, yellow, orange and red lights, respectively) with relatively high quantum yield (19.9%) in DMF solvent. Additionally, thermal behaviors of all compounds were determined by TG and DSC techniques. Surface morphologies of polymers were imaged with scanning electron microscope (SEM). (C) 2017 Production and hosting by Elsevier B.V. on behalf of King Saud University.
Synthesis, Characterization, Electrochemical and Surface Morphologies of Polyazomethines Containing Silane and Phosphazene Units
(Springer/Plenum Publishers, 2017) Temizkan, Kevser; Kaya, İsmet
Polyazomethines containing silane and phosphazene groups were synthesized via elimination reactions of dihydroxy compounds containing imine bonding with phosphazane and silane dichloride. The structures of monomers and polymers containing phosphazane and silane groups were supported by H-1-NMR, C-13-NMR, FT-IR and UV-Vis techniques. Electrochemical properties of the prepared Schiff bases and polymers were given by cyclic voltammetric (CV) analysis. Thermal properties of synthesized monomers and polymers were determined by TG-DTA and TG-DTA, DMA and DSC techniques, respectively. Molecular mass distributions of polymers are determined with gel permeation chromatography (GPC) measurement. Morphologic images of polymers containing heteroatom (silane/phosphazene) and azomethine linkage in the main chain were investigated by SEM techniques. The electrochemical band gap values of SB-1, SB-2, P-1, P-2 and P-3 compounds were found as 3.09, 3.30, 2.63, 3.07 and 3.04 eV, respectively.
Synthesis, characterization, electrochemical and surface morphology properties of poly(azomethine-ester)s
(Springer, 2017) Temizkan, Kevser; Kaya, İsmet
In this study, poly(azomethine-ester) s (PAEs) were synthesized via elimination reactions of aromatic dihydroxy compounds containing imine bonding with terephthaloyl chloride. The structures of PAEs containing different aliphatic chains and ether bridges were confirmed by FT-IR, H-1, C-13-NMR and UV-Vis measurements. Electrochemical parameters of the synthesized SBs and PAEs were determined by cyclic voltammetry measurements. Thermal properties of the synthesized monomers and polymers were investigated by TG-DTA, DMA and DSC techniques. Molecular mass distributions of PAEs are determined with gel permeation chromatography measurements. Morphological and topographic properties of the SBs and PAEs containing azomethine linkage in the main chain were investigated by SEM and AFM techniques, respectively. Maximum particle sizes on surfaces of polymers were calculated with AFM analyses. Surface modifications of poly(azomethine-ester) s and maximum particle size on their surface were studied with topographic and 3D AFM images and particular size curves.

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