Control Laboratory of Agricultural Ministry

İstanbul, Turkey

Control Laboratory of Agricultural Ministry

İstanbul, Turkey
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Dogan F.,Canakkale Onsekiz Mart University | Kaya I.,Canakkale Onsekiz Mart University | Bilici A.,Control Laboratory of Agricultural Ministry
Synthetic Metals | Year: 2011

Azomethine-based phenol polymer, poly-2-{[(6-aminopyridin-2-yl)imino] methyl}-phenol (PAPIMP), was synthesized through the combination of condensation reaction and oxidative polymerization. Polymer isolated from aqueous solution was characterized by UV-vis, FT-IR, NMR and TG, SEC analysis. According to the SEC chromatograms, the number-average molecular weight (Mn), weight-average molecular weight (Mw) and polydispersity index (PDI) values of PAPIMP were determined to be 33,550, 78,900 g mol-1 and 2.352, respectively. Also, optical band gaps (Eg) of APIMP and PAPIMP calculated from cyclic voltammetry (CV) measurements. Also, electrical conductivities of each component measured with four-point probe technique. TG analysis showed that PAPIMP was stable up to 300 °C. The thermal decomposition kinetics of PAPIMP was investigated by means of thermogravimetric analysis in dynamic nitrogen atmosphere at four different heating rates: 5, 10, 15 and 20 °C min-1. The apparent activation energies for thermal decomposition of PAPIMP were obtained by Tang, Flynn-Wall-Ozawa (FWO), Kissenger-Akahira-Sunose (KAS) and Coats-Redfern methods (CR) were 96.97, 105.33, 97.28 and 88.60 kJ mol-1, respectively; the mechanism function and pre-exponential factor were determined by master plots method. The most likely decomposition process was a Dn Deceleration type in terms of the Coats-Redfern and master plots results. © 2010 Elsevier B.V. All rights reserved.


Bilici A.,Control Laboratory of Agricultural Ministry | Kaya I.,Canakkale Onsekiz Mart University | Yildirim M.,Canakkale Onsekiz Mart University
European Polymer Journal | Year: 2011

9,9-Bis(4-aminophenyl)fluorene (APF) polymers were synthesized by two different pathways. The different synthetic routes gave polymers with different structures. FT-IR and NMR studies revealed that the catalytic oxidative polymerisation of APF in acetonitrile produced P2, whereas oxidative polymerisation of APF in aqueous alkaline media gave P3. The effects of these different techniques on spectral, thermal, optical, electrical, electrochemical, and morphological properties of resulting polymers were investigated. © 2010 Published by Elsevier Ltd.


Bilici A.,Control Laboratory of Agricultural Ministry | Dogan F.,Canakkale Onsekiz Mart University | Yildirim M.,Canakkale Onsekiz Mart University | Kaya I.,Canakkale Onsekiz Mart University
Journal of Physical Chemistry C | Year: 2012

The results on the chemical oxidative polymerization of 4-hydroxyquinoline (HQ) are reported. The treatment of HQ with ammonium peroxydisulphate in an acidic aqueous medium afforded a conjugated quinoline oligomer (OHQ). The spectral analysis results suggested that the polymerization of HQ occurred mainly at C3 and C8 positions. The obtained oligomer exhibited an uncommon multicolor emission behavior. Although a wide range of emission colors by using various conjugated oligomer/polymers has been reported in literature many times, quinoline oligomer reported here emitted multicolor when irradiated at different wavelengths. Moreover, a linear relationship was observed between the excitation energy and emission maxima obtained (λ Em = -108.82E Ex = +819.07, R 2 = 0.986). This allows us to effectively tune the photoluminescence colors between blue and orange-red. © 2012 American Chemical Society.


Bilici A.,Control Laboratory of Agricultural Ministry | Kaya I.,Canakkale Onsekiz Mart University | Yildirim M.,Canakkale Onsekiz Mart University
Biomacromolecules | Year: 2010

In this paper, the results on horseradish peroxidase (HRP)-catalyzed oxidative polymerization of amine-functionalized fluorene monomer, 2-amino fluorene (AF), are reported. The resulting polymer exhibits an exciting molecular structure and spectral properties. FT-IR and NMR studies show that the two fluorene units come together by forming an intermediate six-membered pyrazine ring and these formed dimeric units are linked to the each other through C-C couplings to produce fully conjugated polymer structure (AFP). Further characterizations were performed by means of GPC, TGA, DSC, SEM, CV (cyclic voltammetry), fluorescence analyses, and solubilty tests. Optical band gaps of this electroactive polymer was found to be 2.60 eV. AFP emits red light and its emission maxima is drastically affected by the kind of the solvents used. In addition, obtained polymer is soluble in common polar and apolar organic solvents. © 2010 American Chemical Society.


PubMed | Control Laboratory of Agricultural Ministry
Type: Journal Article | Journal: Biomacromolecules | Year: 2010

In this paper, the results on horseradish peroxidase (HRP)-catalyzed oxidative polymerization of amine-functionalized fluorene monomer, 2-amino fluorene (AF), are reported. The resulting polymer exhibits an exciting molecular structure and spectral properties. FT-IR and NMR studies show that the two fluorene units come together by forming an intermediate six-membered pyrazine ring and these formed dimeric units are linked to the each other through C-C couplings to produce fully conjugated polymer structure (AFP). Further characterizations were performed by means of GPC, TGA, DSC, SEM, CV (cyclic voltammetry), fluorescence analyses, and solubility tests. Optical band gaps of this electroactive polymer was found to be 2.60 eV. AFP emits red light and its emission maxima is drastically affected by the kind of the solvents used. In addition, obtained polymer is soluble in common polar and apolar organic solvents.

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