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BOZTOPRAK, YALÇIN

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BOZTOPRAK

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YALÇIN

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Subject: mechanical properties ×

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Now showing 1 - 2 of 2
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    Mechanical properties of double and triple fibre-reinforced epoxy hybrid composites
    (ICE PUBLISHING, 2020) BOZTOPRAK, YALÇIN; Boztoprak, Yalcin
    A composite material can be defined as a combination of two or more materials that provide better properties than the material used alone. Composite materials can be preferred because of their many advantages - for example, they are stronger and lighter compared with conventional materials. Usage of fibre-reinforced composite structures has increased in industries such as automotive, marine transportation, civil engineering, sporting goods, medical equipment and prosthetic devices.
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    Graphene oxide-containing isocyanate-based polyimide foams: Enhanced thermal stability and flame retardancy
    (WILEY, 2021) ÇAKIR, MUSTAFA; Cakir, Mustafa; Kilic, Volkan; Boztoprak, Yalcin; Ozmen, Fadime Karaer
    Isocyanate-based graphene oxide-containing polyimide foams were synthesized by a semi-prepolymer method. In this method, while the first solution containing pre-polymer was derived from pyromellitic dianhydride and excess polymethylene polyphenylene isocyanate (PM200), the second solution contains dianhydride derivatives, water, catalysts, surfactants, and graphene oxide. PIFs were prepared with 0%, 0.25%, 0.50%, 0.75%, and 1% graphene oxide by weight, respectively. PIFs exhibited a minimum side reaction and urea generation was not seen for all PIFs instead of imide bonding. The addition of graphene oxide (GO) leads to a more close-packed structure. Therefore, crosslinking density and thermal stability of graphene oxide-containing polyimide foams increased. Upon the addition of 1% GO, almost seven times higher compression strength was obtained compared to neat PIFs. Also, LOI values supported the theory that thermally stable and flame retardant PIFs can be synthesized via the isocyanate-based process with GO.