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  • Küçük Resim
    Öğe
    Azometin grubu içeren yeni monomerlerin enzimatik oksidatif polimerizasyonu
    (Niğde Üniversitesi / Fen Bilimleri Enstitüsü, 2012) Topal, Yasemin; Yürük, Hüseyin
    Bu çalışmada iki farklı azometin fenol türevleri yapılarından p-toluidin ve 2-hidroksibenzaldehitten 2-[(p-tolimino)metil]fenol sentezlenmiştir. Sentezlenen 2-[(p-tolimino)metil]fenol H2O2 oksidantı varlığında farklı çözücü (aseton, metenol, etanol, DMF, 1,4 -dioksan ve THF) ve farklı pH tamponlarında(3, 4, 5, 6, 7 ve 8) enzimatik oksidatif polikondenzasyon reaksiyonları ile P-[2-(p-tolimino)metil]fenol sentezlendi. Elde edilen ürünlerin karakterizasyonları FT-IR, UV-Vis, !H-NMR, 13C-NMR, TGA/DTA, GPC ve elektriksel iletkenlik analiz yöntemleri ile yapıldı.
  • Küçük Resim Yok
    Öğe
    Horseradish peroxidase-catalyzed polymerization of ortho-imino-phenol: Synthesis, characterization, thermal stability and electrochemical properties
    (ELSEVIER SCIENCE BV, 2017) Topal, Yasemin; Tapan, Senem; Gokturk, Ersen; Sahmetlioglu, Ertugrul
    Enzymatic polymerization of phenols has been investigated extensively over the last decades. However, involving imine functional group in the side chain of an oligophenol and its effect on polymerization is poorly understood. Therefore, the influence of the imine functionality in the side chain of oligophenol for enzymatic polymerization is explored in this work. Ortho-imine substituted phenol, (E)-2-((p-tolylimino) methyl) phenol (PTIMP), was enzymatically polymerized using horseradish peroxidase (HRP) enzyme in aqueous organic solvents and hydrogen peroxide (H2O2) as an oxidant. Different parameters (solvent system, pH and reaction temperature) on polymerization were investigated. EtOH/pH 6.0 buffer (50: 50 vol.%) at 25 degrees C in 24 h under air was found to be the optimum polymerization condition with 65% of yield and Mn = 6100 g/mol (DP approximate to 29, PDI = 1.09). Polymerization of PTIMP in the presence of HRP enzyme catalyst leads to the formation of an oligophenol containing phenylene and oxyphenylene repeat units. The resulting oligophenol is soluble in most of the organic solvents. Characterization of oligo(PTIMP) was achieved by NMR, UV-Vis, CV, FT-IR spectroscopy and thermogravimetric analysis. (C) 2017 King Saud University. Production and hosting by Elsevier B. V. This is an open access article under the CC BY-NC-ND license.