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    Conducting polymer composites based on LDPE doped with poly(aminonaphthol sulfonic acid)
    (Elsevier Science Bv, 2018) Doğan, Fatih; Şirin, Kamil; Kolcu, Feyza; Kaya, İsmet
    The paper presents the mechanical, morphological, thermal and the electrostatic charge dissipative (ESD) properties of binary blends of low-density poly (ethylene) (LDPE) blended with poly (1-amino-2-hydroxy naphthalene-4-sulfonic acid) (PANSA). Blends were prepared by loading 0.5, 1.0 and 3 wt% of PANSA into LDPE matrix in the twin-screw micro extruder. The interaction between PANSA and LDPE was then characterized by FT-IR, DSC, TG, DMA, AFM, SEM and X-RD techniques. The resulting polyolefin-based blends were also investigated by stress-strain curves in order to analyze some physico-mechanical properties. Percentages of the crystallinity of the blends were calculated by FT-IR, DSC and X-RD analyses. The conductivity of PANSA/LDPE blends was determined to be in the range of 10(-11) - 10(-12) S cm(-1) using ESD applications. The antistatic decay time of blend films was found to be of the order of 0.103-1.721 secat corona voltages between -3 kV and 3 kV, concluding that PANSA can be used as an effective ESD material for antistatic coatings of LDPE.
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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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    Elektro-Aktif Flu?oresant Polimerlerin Poliolefin Temelli Malzemelerde Antistatik Materyal Olarak Kullanımı
    (2016) Doğan, Fatih; Bilici, Ali; Şirin, Kamil
    Bu çalı?mada sulfoaminonaftol monomerlerinin sulu (asidik veya bazik) ve organik ortamlarda uygun oksidantlar e?liğinde oksidatif polimerizasyonları gerçekle?tirildi. Polimerizasyonların optimum reaksiyon ?artları incelendi. Sentezlenen polimerlerin karakterizasyonu UV-vis, FT-IR, NMR, SEC, SEM, TEM, DLS, X-RD, PL, AFM ve iletkenlik analizleri ile yapıldı. Elde edilen polimerlerinin ısısal stabiliteleri TG/DTG-DTA, DSC ve DMA analizleri ile belirlendi. Ayrıca her bir polimerin ısısal katı hal bozunma kinetikleri farklı sınıflara ait birçok yöntem kullanılarak hesaplandı ve polimerlerin bozunma basamaklarına ait matematiksel fonksiyonlar bulundu. Çalı?manın diğer a?amasında oksidatif polimerizasyon yöntemi ile hazırlanan farklı oranlardaki polimeriler twin-screw microextruder?de poliolefin temelli malzemeler (AYPET, YYPE ve PP) ile blendleri hazırlandı. Hazırlanan blendlerin spektral, morfolojik, fizikomekanik ve ESD karakterizasyonları yapıldı. Çalı?manın son a?amasında sentezlenen her bir polimerlerin poliolefin temelli malzemelerde meydana getirdiği ısısal deği?imler ve bu deği?imlerle ilgili kinetik modellemeler belirlendi.
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    Improving the mechanical, physical, thermal, and morphological properties of isotactic polypropylene with dialkylperoxide
    (PRINTS PUBLICATIONS PVT LTD, 2013) Şirin, Kamil; Yavuz, Mesut; Çanli, Murat; Avci, Ali; Do?an, Fatih
    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 and thermal properties of Polypropylene (iPP)-High density polyethylene (HDPE) binary blends
    (2017) Şirin, Kamil; Doğan, Fatih; Şirin, Mehtap; Beşergil, Bilsen
    In this study, the mechanical and thermal properties of polypropylene (PP) and high density polyethylene (HDPE) blends in different mixture ratios are investigated. PP and HDPE 10 wt. % added blends are investigated by different tests; thermal analysis such as; melting temperature, crystalline temperature, crystalline energy, involved crystalline ratio, mechanical properties such as; Tensile strength at break, at yield and elongation at break) fitness and the impact resistance. PP and HDPE polymers are semi-crystalline, involving crystalline ratio for PP and HDPE 2.08 to 38.44 % and 4.66 to 62.80 respectively. For these homopolymer’s crystalline phase and blends have two melting points, but they have only one crystalline temperature. The degree of melting and crystalline of blends is not different from the values of PP and HDPE. The tensile strength at the point of flow and breaking point are not varied according to the original homopolymer but the properties of strain at the breaking point are much weakened. Moreover, polymer blends at the value of non-bending, when the comparison make with the homopolymer, an improvement can observed 2.6 % by the increased ratio of HDPE and also the impact properties of the PP can be improved by adding more than 70 wt. % HDPE in to the PP
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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.