1,721,816 research outputs found
Ticari RGB tabanlı elektrokromik cihaz uygulamalarının gerçekleştirilebilmesi için yükseltgenmiş halinde geçirgen, özgün işlenebilir yeşil polimer
No full textMevcut buluşta nötr halde yeşil olan polimenn (PDOPEQ) sentezi için bır yöntem geliştinlmiştir. Bu buluşta geliştinlen yöntem; a) 2,3-bıs(3,4-bıs(desıloksı)fenıl)-5,8-dıbromokuınoksalın'ın elde edilmesi, b) tnbutil (2,3-dıhıdrotiyeno[3,4-b][l,4]dıoksın-5-ıl)stannan c) Venici EDOT moıtelennı alıcı kumoksalm ünitelerine eklemek için yeterli verimde buluş konusu bileşiği (DOPEQ) elde etmek için eşleme kullanılması C-ıoH2iQ, OC10H21 C10H21O d) DOPEQ e) Elektrokimyasal veya kimyasal yöntemler kullanarak nötr halde yeşil polimer (PDOPEQ) elde edilmesi ile karakterize edilir. Bugüne kadar sentezlenen polimerler indirgenmiş halde iken esas olarak mavi ve kırmızı renkleri soğuran/yansıtan polimerlerdir. Bunun aksine, indirgenmiş halde yeşil renkli olan polimer elde etmek için görünür spektrumun mavi ve kırmızı bölgesini ortalayan iki adet soğurma bandı ve dahası bu bantların uygulanan potansiyellerde aynı şekilde işlenmesi gerekir
Further investigation of intramolecular H-bonding in benzimidazole and EDOT containing monomer
No full textDensity functional theory (OFT) calculations of the relative stabilities and harmonic vibrational spectra of four different conformers of 4,7-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-2-phenyl-1H-benzo[d] imidazole (BlmBEd) are presented and compared with experimental IR data. BlmBEd, containing phenyl substituted benzimidazole as the acceptor and 3,4-ethylenedioxythiophene (EDOT) as the donor unit, was electrochemically polymerized in different pH media earlier. Electronic states of nitrogen in benzimidazole unit of synthesized polymeric films were analyzed via X-ray photoelectron spectroscopy. Both DFT and XPS results suggest the presence of an intramolecular H-bond between the amine of the imidazole and the oxygen of the EDOT molecules. Additionally, the quantity of the H-bond can be controlled via treatment of an acid (trifloroacetic acid) and a base (sodium hydroxide) as we stated in our previous study
Electrochromic properties of multicolored novel polymer synthesized via combination of benzotriazole and N-functionalized 2,5-di(2-thienyl)-1H-pyrrole units
No full textSynthesis of new conducting polymers is desired since their electrochemical and optical properties enable them to be used as active layers in many device applications. Benzotriazole and N-functionalized 2,5-di(2-thienyl)-1H-pyrrole (SNS Series) containing polymers showed very promising results as electrochromic materials. In order to observe the effect of the combination of these two units, three new monomers; 2-(6-(2,5-bis(5-methylthiophen-2-yl)-1H-pyrrol-1-yl)hexyl)-4,7-di(thiophen-2-yl)-2H benzo[d][1,2,3]triazole (M1), 2-(6-(2,5-di(thiophen-2-yl)-1H-pyrrol-1-yl)hexyl)-4,7-di(thiophen-2-yl)-2H-benzo[d][1,2,3]triazole (M2) and 2-(6-(2,5-di(thiophen-2-yl)-1H-pyrrol-1-yl)hexyl)-4,7-bis(5-methylthiophen-2-y1)-2H-benzo[d][1,2,3]triazole (M3) were synthesized. To better characterize the electronic and spectroscopic properties of the monomers, density functional theory (DFT) and its time-dependent generalization (TD-DFT) were used to calculate their vertical ionization potentials, vertical electron affinity and to simulate and interpret their infrared and UV-vis spectra. The monomers were electrochemically polymerized and the resultant polymers were characterized with cyclic voltammetry and UV-vis-NIR spectroscopy techniques. An electrochromic device was constructed with electrochemical polymer of M2. The device switched between red and blue colors and showed exceptional optical memory
Características químicas de vinhos cabernet sauvignon produzidos em diferentes regiões do Brasil
Full text linkDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Agrárias. Programa de Pós-Graduação em Ciência dos Alimentos
Synthesis of conductive graft copolymers and their uses as enzyme immobilization matrices
Full text linkFen Bilimleri Enstitüsü, Kimya Ana Bilim DalıÖZET İLETKEN AŞI KOPOLİMERLERİN SENTEZİ VE BUNLARIN ENZİM TUTUKLAMA MATRİSLERİ OLARAK KULLANIMLARI Ş AHMETLİOĞLU Ertuğrul TC. Niğde Üniversitesi Fen Bilimleri Enstitüsü Kimya Anabilim Dalı Danışman : Prof. Dr. Hüseyin YÜRÜK Ortak Danışman : Prof. Dr. Levent TOPPARE Temmuz 2004,105 Sayfa Bu çalışma iki bölümde yapılmıştır. Birinci bölümde tiyofen sonlu poli(vinilalkol) (PVATh) ve pirolden oluşan aşı kopolimeri elektrokimyasal metodla sentezlenmiştir. Kopolimer üç farklı elektrolit; p-toluen sülfonik asit (PTSA), sodyum dodesil sülfat (SDS) ve tetrabütilamonyum tetrafloroborat (TBAFB) kullanılarak elde edildi. Kopolimerlerin ve tiyofen sonlu poli(vinilalkol)'ün karakterizasyonu; dönüşümlü voltametri (CV), taramalı elektron mikroskobu (SEM), termal gravimetri (TGA), diferansiyel taramalı kalorimetri (DSC), jel permütasyon kromatografisi (SEC), ^-NMR, ve FT/IR gibi tekniklerin kombinasyonu kullanılarak yapıldı. Kopolimer filmlerinin iletkenliği dört nokta tekniği ile belirlendi. Çalışmanın ikinci bölümünde tiyofen son gruplu poli(vinil alkol) ve pirol'den oluşan kopolimer matris olarak kullanılarak invertaz ve glikoz oksidaz enzimleri elektrokimyasal yöntemle tutuklandı. Kinetik parametreleri Vmax (maksimum reaksiyon hızı) ve Km (substrat ilgisi) hem sertbest hemde immobilize enzimler için belirlendi. Destek elektrolitin metkisini görmek için/?-toluen sülfonik asit ve sodyum dodesil sülfat elektrolitleri kullanıldı. Raf ömrü, çalışma kararlılığı ve enzim tutuklanmış filmlerin yüzey yapılan incelendi. Anahtar Sözcükler: Polivinil alkol, iletken kopolimer, glikoz oksidaz, invertaz, immobilizasyon ivABSTRACT SYNTHESIS OF CONDUCTIVE GRAFT COPOLYMERS AND THEIR USES AS ENZYME IMMOBILIZATION MATRICES ŞAHMETLİO?LU Ertuğrul Niğde University Graduate School of Natural and Applied Sciences Department of Chemistry Supervisor : Prof. Dr. Hüseyin YÜRÜK Cosupervisor : Prof. Dr. Levent TOPPARE July 2004, 105 pages This study has been carried out in two steps, In first step, graft copolymers of poly( vinyl alcohol) with thiophene moiety (PVATh) and pyrrole were synthesized by electrochemical polymerization method. The synthesis of PVATh and pyrrole copolymers were achieved electrochemically by using three different electrolytes, p-toluene sulfonic acid (PTSA), sodium dodesyl sulphate (SDS) and tetrabutyl ammonium tetrafluoroborate (TBAFB). Characterization of PVATh and graft copolymers were performed by combined techniques, consist of cyclic voltammetry (CV), scannig electron microscopy (SEM), thermal gravimetry (TGA), diferantial scanning calorimetry (DSC), gel permeation chromatography (GPC) analyses, ^-NMR and FT/IR studies. The conductivity of copolymer films were measured by four-probe technique. In the second step; Immobilization of invertase and glukose oxidase enzymes were achieved by using conductive copolymers of PVATh with pyrrole as immobilization matrices via electrochemical polymerization. The kinetic parameters, Vmax (maximum reaction rate) and Km (substrate affinity), of both free and immobilized enzymes weredetermined. To see the effect of supporting electrolyte on enzyme activity, PTSA and SDS were used. Key words: Poly(vinyl alcohol), conducting polymers, glucose oxidase, invertase, immobilization V
Synthesis and characterization of a random copolymer having variable thiophene units on the backbone
No full textM.S. - Master of Scienc
Immobilization of invertase in pyrrole capped polyazotetrahydrofuran/polypyrrole and polytetrahydrofuran-block-polystyrene/polypyrrole conducting graft polymer matrices
No full textImmobilization of invertase and glucose oxidase in poly 2-(3-thienyl) acetate/polypyrrole matrices
No full text- …
