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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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    Öğe
    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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    Öğe
    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