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    Immobilization of invertase and glucose oxidase in conducting copolymers of thiophene functionalized poly(vinyl alcohol) with pyrrole
    (ELSEVIER SCIENCE BV, 2006) Sahmetlioglu, E; Yuruk, H; Toppare, L; Cianga, I; Yagci, Y
    In this study, immobilizations of invertase and glucose oxidase were achieved in conducting thiophene functionalized copolymers of vinyl alcohol with thiophene side groups and pyrrole (PVATh/PPy) via electrochemical polymerization. The kinetic parameters, V-max (maximum reaction rate) and K-m (substrate affinity), of both free and immobilized enzymes were determined. The effect of supporting electrolytes, p-toluene sulfonic acid and sodium dodecyl sulfate, on the enzyme activity and film morphologies was examined. The optimum temperature, operational and storage stabilities of immobilized enzymes were determined. PVATh/PPy copolymer was found to exhibit significantly enhanced properties compared to pristine polypyrrole. (c) 2005 Elsevier B.V. All rights reserved.
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    Synthesis and characterization of conducting copolymers of poly(vinyl alcohol) with thiophene side-groups and pyrrole
    (WILEY, 2004) Sahmetlioglu, E; Yuruk, H; Toppare, L; Cianga, I; Yagci, Y
    Graft copolymers of poly(vinyl alcohol) with thiophene side-groups and pyrrole were synthesized by electrochemical polymerization methods. Poly(vinyl alcohol) with thiophene side-groups (PVATh) was obtained from the reaction between poly(vinyl alcohol) (PVA) and thiophene-3-acetic acid. The syntheses of copolymers Of PVATh and pyrrole were achieved electrochemically by using three different supporting electrolytes, p-toluene sulfonic acid (PTSA), sodium dodecyl sulfate (SDS) and tetrabutylammonium tetrafluoroborate (TBAFB). Characterization of PVATh and graft copolymers was performed by a combination of techniques including cyclic voltammetry, scanning electron microscopy, thermal gravimetry, differential scanning calorimetry, size-exclusion chromatography, H-1 NMR and FT-IR. The conductivities were measured by the four-probe technique. (C) 2004 Society of Chemical Industry.
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    Synthesis and characterization of oligosalicylaldehyde-based epoxy resins
    (SLOVAK ACADEMIC PRESS LTD, 2006) Sahmetlioglu, E; Mart, H; Yuruk, H; Surme, Y
    The synthesis of a new epoxy resin of oligosalicylaldehyde by the reaction with epichlorohydrin is reported. New resin's epoxy value and chlorine content were determined and found to be 25 % and 1 %, respectively. The characterization of the new resin was instrumented by FTIR, H-1 NMR, scanning electron microscopy, and thermal gravimetric analyses. TGA results showed that the cured epoxy resin has a good resistance to thermal decomposition. The mass losses of cured epoxy resin were found to be 5 %, 10 %, 50 % at 175 degrees C, 240 degrees C and 400 degrees C, respectively. On the curing procedure the resin was cured with polyethylenepolyamine at 25 degrees C for 8 h and 100 degrees C for 1.5 h. The FTIR spectrum of new epoxy resin gave the peak of oxirane ring a (nu) over bar = 918 cm(-1).
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    Synthesis and properties of novel Schiff base oligomers based on oligo-4-hydroxybenzaldehyde
    (JOHN WILEY & SONS INC, 2004) Mart, H; Sacak, M; Yuruk, H; Sahmetlioglu, E; Vilayetoglu, AR
    Condensation of oligo-4-hydroxybenzaldehyde with aniline, 2-chloroaniline, 2-aminophenol, 2-aminotoluene, 4-aminotoluene, and 4-nitroaniline gave the corresponding Schiff base oligomers (OFAP, OKAP, OHAP, OOAP, OTAP, and ONAP, respectively). The products were characterized by H-1 NMR, Fourier transform infrared, ultraviolet-visible, and elemental analyses. The number-average molecular weight, mass-average molecular weight, and polydispersity index (PDI) values of the Schiff base oligomers were determined. Thermogravimetric analysis was used to compare the thermal stability of the oligomers, which showed the Schiff base oligomers to be resistant to thermooxidative decomposition. Weight loss of 5% and 50% occurred at temperatures of 122 and 475 degreesC; for OFAP, at 118 and 453 degreesC; for OKAP, at 182 and 491 degreesC; for OHAP, at 150 and 452 degreesC; for OOAP, at 132 and 401 degreesC; for OTAP, and at 193 and 414 degreesC for ONAP. (C) 2004 Wiley Periodicals, Inc.