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    Effect of CaCO3 Filler Component on Solid State Decomposition Kinetic of PP/LDPE/CaCO3 Composites
    (Taylor & Francis Inc, 2009) Şirin, Kamil; Doğan, Fatih; Balcan, Mehmet; Kaya, İsmet
    In this study, the effect of addition Calcium carbonate (CaCO3) filler component on solid state thermal decomposition procedures of Polypropylene-Low Density Polyethylene (PP-LDPE; 90/10 wt%) blends involving different amounts (5, 10, 20 wt%) Calcium carbonate (CaCO3) was investigated using thermogravimetry in dynamic nitrogen atmosphere at different heating rates. An integral composite procedure involving the integral iso-conversional methods such as the Tang (TM), the Kissinger-Akahira-Sunose method (KAS), the Flynn-Wall-Ozawa (FWO), an integral method such as Coats-Redfern (CR) and master plots method were employed to determine the kinetic model and kinetic parameters of the decomposition processes under non-isothermal conditions. The Iso-conversional methods indicated that the thermal decomposition reaction should conform to single reaction model. The results of the integral composite procedures of TG data at various heating rates suggested that thermal processes of PP-LDPE-CaCO3 composites involving different amounts of CaCO3 filler component (5, 10, 20 wt%) followed a single step with approximate activation energies of 226.7, 248.9, and 252.0 kJ.mol- 1 according to the FWO method, respectively and those of 231.3, 240.1 and 243.0 kJ mol- 1 at 5 degrees C min- 1 according to the Coats-Redfern method, the reaction mechanisms of all the composites was described from the master plots methods and are Pn model for composite C-1, Rn model for composites C-2 and C-3, respectively. It was found that the thermal stability, activation energy and thermal decomposition process changed by the increasing CaCO3 filler weight in composite structure.
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    Ring-opening metathesis polymerization of bicyclo[2.2.1]hepta-2,5-diene (norbornadiene) initiated by new ruthenium(II) complex
    (Wiley-Blackwell, 2013) Yalcinkaya, Esra Evrim; Dayan, Osman; Balcan, Mehmet; Guler, Cetin
    The polymerization of norbornadiene (NBD) initiated by a novel ruthenium (Ru)(II) complex (3) containing 1,1'-pyridine-2,6-diylbis[3-(dimethylamino)prop-2-en-1-one] (1) as ligand has been investigated. Ru complexes exhibit more catalytic activity in the ring-opening metathesis polymerization (ROMP) of NBD when activated with trimethylsilyldiazomethane (TMSD). The influence of the various experimental parameters such as reaction time and temperature, nature of the solvent and catalyst, ratio of the NBD/Ru, and TMSD addition has been investigated. The polymers have been obtained in high yields with a relatively low polydispersity index for ROMP and a high (M) over bar (n) and (M) over bar (w) values in a monomodal distribution. Their structures have been determined by means of FTIR and H-1-NMR spectroscopy. Thermal properties have been determined via thermogravimetric analysis and DTG methods. The NBD polymerization results that initiated by Ru-based catalyst coordinated to amine ligand have been compared to initiated by [RuCl2(p-cymene)](2). (C) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 127: 1691-1696, 2013
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    Synthesis, characterization, and thermal degradation kinetics of poly(decamethylene 2-oxoglutarate)
    (Wiley, 2008) Doğan, Fatih; Akat, Hakan; Balcan, Mehmet; Kaya, İsmet; Yürekli, Mehmet
    Poly(decamethylene 2-oxoglutarate) [poly (DMOG)] was synthesized by a melt polycondensation reaction. The structure of poly(DMOG) was confirmed by means of Fourier transform infrared, H-1-NMR, and C-13 NMR spectroscopies. The molecular weight distribution values of poly(DMOG) were determined with size exclusion chromatography. The number-average molecular weight, weight-average molecular weight, and polydispersity index values of poly(DMOG) were found to be 13,200, 19,000, and 1.439, respectively. Also, characterization was made by thermogravimetry (TG)-dynamic thermal analysis. The kinetics of the thermal degradation of poly (DMOG) was investigated by thermogravimetric analysis at different heating rates. TG curves showed that the thermal decomposition of poly(DMOG) occurred in one stage. The apparent activation energies of thermal decomposition for poly(DMOG), as determined by the Tang method, the Flynn-Wall-Ozawa method, the Kissinger-Akahira-Sunose method, and the Coats-Redfern method were 122.5, 126.8, 121.4, and 122.9 kJ/mol, respectively. The mechanism function and pre-exponential factor were also determined by the master plots method. (C) 2008 Wiley Periodicals, Inc.
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    The influence of CaCO3 filler component on thermal decomposition process of PP/LDPE/DAP ternary blend
    (Wiley, 2010) Doğan, Fatih; Şirin, Kamil; Kaya, İsmet; Balcan, Mehmet
    Polypropylene-low density polyethylene (PP-LDPE) blends involving PP-LDPE (90/10 wt%.) with (0.06 wt%) dialkyl peroxide (DAP) and different amounts (5, 10, 20 wt%) of calcium carbonate (CaCO3) were prepared by melt-blending with a single-screw extruder. The effect of addition of CaCO3 on thermal decomposition process and kinetic parameters, such as activation energy and pre-exponential factor of PP-LDPE blend with DAP matrix, was studied. The kinetics of the thermal degradation of composites was investigated by thermogravimetric analysis in dynamic nitrogen atmosphere at different heating rates. TG curves showed that the thermal decomposition of composites occurred in one weight-loss stage. The apparent activation energies of thermal decomposition for composites, as determined by the Tang method (TM), the Kissinger-Akahira-Sunose method (KAS), the Flynn-Wall-Ozawa method (FM)), and the Coats-Redfern (CR) method were 156.6, 156.0, 159.8, and 167.7 KJ.mol(-1) for the thermal decomposition of composite with 5 wt% CaCO3, 191.5, 190.8, 193.1, and 196.8 kJ.mol(-1) for the thermal decomposition of composite with 10 wt% CaCO3, and 206.3, 206.1, 207.5, and 203.8 kJ mol(-1) for the thermal decomposition of composite with 20 wt% CaCO3, respectively. The most likely decomposition process for weight-loss stages of composites with CaCO3 content 5 and 10 wt% was an A sigmoidal type. However, the most likely decomposition process for composite with CaCO3 content 20 wt% was an R-n contracted geometry shape type in terms of the CR and master plots results. It was also found that the thermal stability, activation energy, and thermal decomposition process were changed with the increase in the CaCO3 filler weight in composite structure. Copyright (C) 2009 John Wiley & Sons, Ltd.