Yazar "Dogan, Mehmet" seçeneğine göre listele

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    Effect of carbon fiber amount and length on flame retardant and mechanical properties of intumescent polypropylene composites
    (Sage Publications Ltd, 2018) Atabek Savas, Lemiye; Mutlu, Aysenur; Dike, Ali Sinan; Tayfun, Umit; Dogan, Mehmet
    The effects of carbon fiber amount and length were studied on the flame retardant, thermal, and mechanical properties of the intumescent polypropylene composites. The flame retardant properties of the intumescent polypropylene-based composites were investigated using limiting oxygen index, vertical burning test (UL-94), and mass loss calorimeter. The mechanical properties of the composites were studied using tensile test and dynamic mechanical analysis. According to the flammability tests results, the antagonistic interaction was observed between carbon fiber and ammonium polyphosphate. The limiting oxygen index value reduced steadily as the added amount of carbon fiber increased. Mechanical test results revealed that the addition of carbon fiber increased the tensile strength and the elastic modulus as the added amount increased. No effect of carbon fiber length was observed on the flammability, fire performance, and tensile properties of composites, whereas the elastic modulus increased as the carbon fiber initial length increased.
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    Influence of zinc borate on flame retardant and thermal properties of polyurethane elastomer composites containing huntite-hydromagnesite mineral
    (Wiley, 2017) Dike, Ali Sinan; Tayfun, Umit; Dogan, Mehmet
    The effect of zinc borate (ZnB) was studied on the flame retardant and thermal properties of thermoplastic polyurethane containing huntite-hydromagnesite. The flame retardant properties of thermoplastic polyurethane-based composites were investigated using limiting oxygen index, vertical burning test (UL 94), thermogravimetric analysis, and mass loss calorimeter. No remarkable effect of ZnB was observed on the flammability properties of composites. UL 94 rating did not change regardless of the added amount of ZnB, and the slight increase in limiting oxygen index value was observed at ratio of 1:1. The adjuvant effect of ZnB was observed during the mass loss calorimeter studies by increasing the barrier effect of the residue in the condensed phase and by increasing the formation of incombustible gasses in the gas phase. The highest fire performance was achieved at ratio of 1:1.
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    Öğe
    Mechanical Properties of Woven Fabric Reinforced All-Polypropylene Composites
    (Taylor & Francis Inc, 2014) Seyhoglu, Hatice; Dike, Ali Sinan; Unlu, Saban Murat; Celik, Atila; Dogan, Mehmet
    Random copolymer polypropylene (co-PP) and beta-nucleated PP (-PP) produced with nucleant, which was not completely selective, were used as matrix materials. The effect of matrix type and consolidation temperature on the static and dynamic mechanical properties of woven tape-reinforced all-PP composites were investigated. The mechanical properties of all-PP composites strictly depended on the matrix type and the consolidation temperature. Co-PP-based composites had higher tensile strength and lower impact strength than -PP-based composites. The maximum tensile strength and storage modulus was achieved at a consolidation temperature of 10 degrees C above the melting point of both matrix materials.