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Öğe Ionic interactions in blends of polyamidines and proton donor terminated poly(alkylene ether)s(AMER CHEMICAL SOC, 2005) Mart, H; Oertel, U; Komber, H; Haussler, L; Bohme, F4-(Iminomethyl)phenol and 4-(iminomethyl)benzoic acid terminated aliphatic polyethers were obtained by conversion of Jeffamines with respective aromatic aldehydes. Mixtures of these polymers with polyamidines showed improved compatibility or even complete miscibility because of ionic complexes formed between the end groups of the modified polyethers and the basic amidine groups. Depending on composition and molecular weight of the components, blends with two or one glass transitions were obtained. In the case of 4-(iminomethyl)phenol terminated polyethers, deprotonation of the end groups resulted in a distinct change of the UV/vis absorption spectrum. This spectral alteration is discussed with respect to quantification of interactions in polymer blends.Öğe Oligo-ortho-chloroazomethinephenol and its metal complexes: Synthesis, characterization, antimicrobial and thermal properties(TAYLOR & FRANCIS INC, 2005) Mart, HThe new Schiff base oligomer (oligo-ortho-chloroazomethinephenol) was synthesized by the condensation of ortho-chloroaniline with oligosalicylaldehyde (OSA). Oligomer-metal complexes of oligo-ortho-chloroazomethinephenol (OKAP) with Cu(II), Zn(II) and Co(II) were synthesized. The properties of OKAP and oligomermetal complexes were studied by elemental, UV-Vis, H-1-NMR, FT-IR, magnetic susceptibility analyses. The number average molecular weight and mass average molecular weight OKAP were found to be 1494 g (.) mol(-1) and 5418g (.) mol(-1), respectively. Elemental analyses of oligomer-metal complexes suggest that the ratio of metal to oligomer is 1:2. The results indicate that the OKAP coordinate through azomethine nitrogen and phenolic oxygen to the metal ions. Antimicrobial activity of OKAP was tested against S. cerevisiae, B. subtilis, E. coli, K. pneumoniae, M. luteus and S. aureus. The thermal stabilities of the OKAP and oligomer-metal complexes were compared by ther-mogravimetric (TG) analyses. According to TG, OKAP, and oligomer-metal complexes were stable against temperature and thermooxidative decomposition. The weight losses of OKAP and oligomer-metal complexes were found to be at 400 and 800 degrees C at 20.2 and 50.0 (OKAP), 17.1 and 41.1 (Cu(II)), 13.4 and 38.5 (Zn(II)), 18.3 and 68.2 (Co(II)), %, respectively. Based on half degradation temperature (T-50%) parameters, Cu(II) and Zh(II) complexes were more resistant than the OKAP and Co(H) complex.Öğe Synthesis and characterization of oligosalicylaldehyde-based epoxy resins(SLOVAK ACADEMIC PRESS LTD, 2006) Sahmetlioglu, E; Mart, H; Yuruk, H; Surme, YThe 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).Öğe 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, ARCondensation 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.Öğe Synthesis, characterization and thermal degradation of some copper (II), zinc (II) and cobalt (II) complexes with oligosalicylaldehyde(ELSEVIER SCI LTD, 2004) Mart, H; Vilayetoglu, ARThe complexes of copper (II), zinc (II) and cobalt (II) complexes with oligosalicylaldehyde (OSA) were synthesized. The oligomer metal complexes were characterized by FT-IR, magnetic moments and elemental analyses methods. Elemental analyses of oligomer-metal complexes suggest that the ratio of metal to oligomer is 1:2. The thermal stability of the oligomer-metal complexes was compared by thermogravimetric (TG) analyses. According to TG, oligomer-metal complexes were stable throughout to temperature and thermooxidative decomposition. The weight losses of oligomer-metal complexes were found to be 5 and 50% at 191 and 525 (Cu(II)), 300 and 592 (Zn(II)) and 245 and > 600 (Co(II)), degreesC, respectively. (C) 2003 Elsevier Ltd. All rights reserved.Öğe The synthesis and properties of oligosalicylaldehyde and its Schiff base oligomers(ELSEVIER SCI LTD, 2001) Kaya, I; Vilayetoglu, AR; Mart, HThe products and oxidative polycondensation reaction conditions of salicylaldehyde (SA) with air oxygen and sodium hypochloride (NaOCl) were studied. In this reaction, NaOCl was observed to be more active than O-2 and their optimum reaction conditions were determined. Oligosalicylaldehyde (OSA) was synthesized from the oxidative polycondensation of SA with air and NaOCl in an aqueous alkaline medium between 85 and 100 degreesC. The products were characterized by H-1-NMR, FT-IR, UV-Vis and elemental analysis. The number average molecular weight, mass average molecular weight and polydispersity index values of OSA synthesized at medium NaOCl and O-2 were found to be 3700, 5990 g mol(-1), 1.62 and 1690, 5150 g mol(-1), 3.05, respectively. At the optimum reaction conditions, the yield of the reaction products were found to be 65.5% (O-2) and 71.4% (NaOCl). About 80% SA was converted to OSA. TG analyses showed OSA to be resistant to thermo-oxidative decomposition. The weight loss of OSA were found to be 5, 50 and 89% at 217, 587 and 100 degreesC, respectively. Also, new oligomeric Schiff bases were synthesized from condensation of OSA with aniline, p-toluidine and p-nitroaniline and their the structures and properties were determined. (C) 2001 Elsevier Science Ltd. All rights reserved.Öğe The synthesis and thermal properties of oligo-3-hydroxybenzaldehyde synthesized by oxidative polycondensation(JOHN WILEY & SONS INC, 2006) Mart, H; Sokmen, T; Yuruk, HPolymerization of 3-hydroxybenzaldehyde was investigated by oxidative polycondensation (OP) method. No polycondensation reaction was observed both in acidic (in CH3COOH) and organic (in THF) media. Polycondensation was carried out with hydrogenperoxide (H2O2) in an aqueous alkaline medium at 90 degrees C. The product was characterized by H-1 NMR, C-13 NMR, FTIR, UV-vis, and elemental analysis. The number average molecular weight, mass average molecular weight, and polydispersity index values of O-3HBA were found to be 3600, 8000 g mol(-1), and 2.22, respectively. The product (O-3HBA) with reactive aldehyde and hydroxyl group was soluble in most polar organic solvents and was composed of phenylene units. Thermal properties of the oligomer were investigated by thermogravimetric analyses under an air atmosphere. The weight loss of O-3HBA was found to be 5 and 50% at 231 and > 1000 degrees C, respectively. The carboneous residue of the O-3HBA was 54% at 1000 degrees C. (c) 2006 Wiley Periodicals, Inc.Öğe The synthesis, characterization and thermal stability of oligo-4-hydroxybenzaldehyde(ELSEVIER SCI LTD, 2004) Mart, H; Yuruk, H; Sacak, M; Muradoglu, V; Vilayetoglu, AROligo-4-hydroxybenzaldehyde (OHBA) was synthesized from the oxidative polycondensation of 4-hydroxybenzaldehyde (HBA) with hydrogenperoxide (H2O2) in an aqueous alkaline medium at 85 degreesC. The product was characterized by H-1 NMR, FT-IR, UV-Vis and elemental analysis. The number average molecular weight, mass average molecular weight and polydispersity index values of OHBA were found to be 5171, 8625 g mol(-1) and 1.668, respectively. The thermal stability of the oligomer was measured by thermogravimetric analyses (TG) under an air atmosphere. TG analyses showed OHBA to be resistant to thermo-oxidative decomposition. The weight loss of OHBA was found to be 5, 50 and 89% at 171, 845 and 900 degreesC, respectively. According to TG analyses, the carboneous residues of the OHBA was 49.29% at 900 degreesC. (C) 2003 Elsevier Ltd. All rights reserved.
