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Öğe Excess volumetric properties of mixtures (epichlorohydrine plus toluene and epichlorohydrine plus xylene) at 298.15, 308.15, 323.15, and 338.15 K1(Interperiodica, 2004) Vural, US; Muradoglu, V; Yuruk, HThe densities and excess molar volumes of (epichlorohydrine + toluene and xylene) mixtures were determined at different temperatures. The graphs of excess molar volumes against mole fraction of mixtures show a negative and positive slope because of charge-transfer interaction and physical forces at 298.15, 308.15, 323.15, and 338.15 K, respectively.Öğe Excess volumetric properties of mixtures epichlorohydrine plus acetone or chloroform at 291.15 and 296.15 K(Interperiodica, 2003) Vural, US; Yuruk, H; Muradoglu, VThe excess molar volumes and densities of mixtures containing epichlorohydrine, acetone, and chloroforrn were determined at different temperatures by the Redlich-Kister equation. Chemical interaction and physical forces are very important influences on the excess molar volume of (epichlorohydrine + acetone or chloroform) mixtures. In addition, the variations of excess molar volumes were expressed as function of temperature.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.