Browsing by Author "Çanli M."

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    Improving the mechanical, physical, thermal, and morphological properties of isotactic polypropylene with dialkylperoxide
    (PRINTS PUBLICATIONS PVT LTD, 2013) Şirin K.; Yavuz M.; Çanli M.; Avci A.; Doǧan F.
    In this study, the influence of the visbreaking agent (DAP) on mechanical, physical, thermal and morphological properties of PP has been studied. For this reason, isotactic polypropylene (PP) matrices containing 0.01, 0.02, 0.04, 0.06, 0.08, and 0.1 wt% of dialkylperoxide [2, 5dimethyl-2,5-di (tert-butyl peroxy)-hexane, (DAP)] were prepared by using a single-screw extruder. As a result of DAP addition, the crystallinity ratio of the PP matrices has changed between 2.67-7.80%. Mechanical properties of the matrices have been improved. Particularly, the mechanical tests of PP have given Interesting results when compounded with 0.02 wt.% dialkyl peroxide. The microstructure of isotactic polypropylene matrix was investigated by scanning electron microscopy (SEM). From SEM analysis, it was observed that the surface disorder increased by the increasing amount of DAP. Thermal analyses of the matrices were investigated using thermogravimetry in dynamic nitrogen atmosphere at different heating rates. The Flynn-WallOzawa (FWO), Kissinger and master plots method were employed to determine the kinetic model and kinetic parameters of the decomposition processes under non-isothermal conditions. It was found that the thermal stability, activation energy and thermal decomposition processes were all changed by increasing amount of DAP in the matrix structure. © MD Publications Pvt. Ltd.
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    Mechanical properties of polypropylene (PP)+high-density polyethylene (HDPE) binary blends: Non-isothermal degradation kinetics of PP+HDPE (80/20) Blends
    (2013) Şirin K.; Doǧan F.; Çanli M.; Yavuz M.
    In this study, the mechanical properties and non-isothermal degradation kinetics of polypropylene (PP), high-density polyethylene (HDPE) with dilauroyl peroxide and their blends in different mixture ratios were investigated. The effects of adding dilauroyl peroxide (0-0.20wt%) on the mechanical and thermal properties of PP+HDPE blends have been studied. On the other hand, the kinetics of the thermal degradation and thermal oxidative degradation of PP+HDPE (80/20wt%) blends were studied in different atmospheres, to analyze their thermal stability. The kinetic and thermodynamic parameters such as the activation energy, Ea, the pre-exponential factor, A, the reaction order, n, the entropy change, the enthalpy change, and the free energies of activated complex related to PP, HDPE, and blend systems were calculated by means of the several methods on the basis of the single heating rate. A computer program was developed for automatically processing the data to estimate the reaction parameters by using different models. Most appropriate method was determined for each decomposition step according to the least-squares linear regression. © 2013 John Wiley & Sons, Ltd.
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    Cytogenetic effects of 48titanium (48TI) on meristematic cells of root tips of lens culinaris med
    (2014) Sepet H.; Çanli M.; Özdemdr A.; Bozdaǧ B.; Özdemdr C.
    Cytogenetic effects of 48Titanium (48Ti) on meristematic cells of root tips belonging to the plant (Lens culinaris Medik.) have been Investigated. Seeds of the plant, prepared were kept in 48Ti standart for different time period as control during 1/4, 1/2, 1, 2, 4, 8, 12, 16, 20, 24 hours. Seeds treated with 48Ti were made sprout and the root tips obtained were prepared for microscopic examination. At the end of the microscopic examinations, some abnormalities as chromosome breakings, chromosome dispersion, bridge chromosome, chromosome adherence, ring chromosome were observed. Abnormalities were seen at each treatment depended on the time periods. Variety and number of abnormality were usually seen to be increasing, depending on the increase of treatment time. The results obtained were evaluated statistically.
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    Influence of dilauroyl peroxide on mechanical and thermal properties of different polypropylene matrices
    (Polymer Society of Korea, 2015) Şirin K.; Yavuz M.; Çanli M.
    In this study, the influence of dilauroyl peroxide on mechanical and thermal properties of different polypropylene (PP) matrices was investigated. Polypropylene matrices, different molecular weight isotactic PP containing 0.01, 0.02, 0.04, 0.06, 0.08, and 0.1 wt% of dilauroyl peroxide (DLP) were prepared by using a single-screw extruder. The effect of the visbreaking agent (DLP) on mechanical, physical, thermal and morphological properties of different molecular weight PP had been studied. Mechanical properties (tensile strength at break point, at yield and elongation at break point), melt flow index (MFI), scanning electron microscope (SEM) and differential scanning calorimetric (DSC) analyses of these matrices were examined. Melting (Tm) and crystallization (Tc) temperatures, crystallinity ratio (%) and enthalpies were determined. The microstructure of isotactic polypropylene matrix was investigated by scanning electron microscopy (SEM). From SEM analysis, it was observed that the surface disorder increased by the increasing amount of DLP. As a result of DSC analyses, the crystallinity ratio of the PP matrices has varied between 1.64-7.27%. Mechanical properties of the matrices have been improved. Particularly, the mechanical tests of PP have given interesting results when compounded with 0.06-0.08 wt% dilauroyl peroxide (DLP). Mechanical properties and thermal decomposition processes were all changed by increasing the amount of DLP in the matrix structure. © 2015 The Polymer Society of Korea. All rights reserved.
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    A novel Turkish natural zeolite (clinoptilolite) treated with hydrogen peroxide for Ni2+ ions removal from aqueous solutions
    (Taylor and Francis Inc., 2016) Çanli M.; Abali Y.
    The removal of Ni(II) from aqueous solution by batch adsorption technique using a novel Turkish zeolite from Akdere region was investigated. Activation of the zeolite was achieved with hydrogen peroxide. After elementary characterization of the adsorbent, the influence of contact time, pH, adsorbent amount, initial Ni(II) concentration, and temperature on the selectivity of the removal process was investigated. Results showed that increase in adsorbent dosage led to increase in Ni(II) adsorption due to increased number of adsorption sites. Freundlich model fitted the experimental data better than Langmuir model. Adsorption process was found to be highly pH dependent. The optimum pH for adsorption of Ni(II) was found to be 7. Adsorption equilibrium attained within 1 h time. The sorption of Ni(II) increased with rise of temperature. The adsorption process was spontaneous (ΔG° ads <0) and endothermic (ΔH° ads >0), supporting also the chemisorption is the rate-determining step. © 2015 Balaban Desalination Publications. All rights reserved.