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KARTAL, İLYAS

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KARTAL

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İLYAS

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2023 - 20242
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Subject: Chemistry ×

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    PublicationOpen Access
    Mechanical and thermal properties of fumed silica-incorporated silane-terminated urethane/epoxy-interpenetrating polymer network nanocomposites
    (2024-01-01) AKIN, EMRE; ÇAKIR, MUSTAFA; KARTAL, İLYAS; AKIN E., ÇAKIR M., KARTAL İ.
    In this study, it was aimed to improve the mechanical and thermal properties of epoxy materials based on diglycidyl ether of bisphenol-A-based. For this purpose, three different nanocomposite materials were prepared at various ratios including a fumed silica nanoparticle-reinforced epoxy nanocomposite (FSN), an epoxy/silane-terminated urethane (STU) hybrid interpenetrating polymer network (IPN) nanocomposite (SHIN), and a fumed silica-reinforced epoxy/STU hybrid IPN nanocomposite (FSHIN). While synthesizing SHIN, 3-isocyanato propyl trimethoxy silane (ICPTMS) and poly (hexamethylene carbonate) diol were used. The synthesized STU polymer chains were crosslinked by reacting them with TEOS via the sol–gel process. Therefore, hybrid networks were obtained. Moreover, fumed silica nanoparticles were incorporated into the hybrid networks via the sol–gel process for FSHINs. The three different nanocomposite materials exhibited much more improved properties than the neat epoxy. The most prominent nanocomposite was FSHIN. In comparison with the neat epoxy, Young\"s modulus, ultimate tensile strength, and Izod impact resistance values increased at ratios of 53%, 50%, and 223%, respectively. Glass transition temperature values and char yield values increased substantially in all nanocomposites. However, thermal decomposition temperatures increased only for FSNs. Moreover, these values for FSHINs that were very close to those of the neat epoxy were considerably higher than those of SHINs. Highlights: Fumed silica-incorporated silane-terminated urethane/epoxy IPN nanocomposites. Substantially improved mechanical properties and impact resistance. Improved thermal stability.
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    PublicationOpen Access
    Fabrication and characterization of hazelnut shell powders-loaded poly (lactic acid) (PLA) composite fibers
    (2023-10-01) KARTAL, İLYAS; KARTAL İ., Sengor I.
    In this research, fibers were obtained by adding hazelnut shell powders which are a natural filler material (HSP) at different concentrations into Poly (lactic acid) (PLA) by using the electrospinning method, which is the most common method to obtain fibers. Scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), tensile strength measurement, and physical analysis such as density, surface tension, viscosity, electrical conductivity test was performed after the fiber production process. The results obtained from this study, fibers showed beadles and smooth surfaces. The diameter distribution of these fibers was observed at 2092 µm without hazelnut shell powder. HSP was added to the composites (ϕ=2379,64±635,268 µm for b; ϕ=25581000,339±,806 µm for c; ϕ=2619,24±967,364µm) and diameters were increased. This result had shown, that by increasing the HSP proportion in the PLA/HSP solution, the average diameters of the fibers were increased. The tensile strength of the fibers decreased between the s1-s4 specimens. It has been shown that the tensile strength decreases as the diameter increases. The resulting structures of the fibers possessed antiseptic properties, which are attractive for many biomedical applications.