Person: ESMER, KADİR
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ESMER
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KADİR
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Publication Metadata only Tungsten Trioxide Reinforced Epoxy Composites with Increased Dielectric Permittivity and Conductivity(2022-09-04) ŞAHİN, NAZLICAN; ESMER, KADİR; ŞAHİN N., KARABUL Y., KILIÇ M., GÜVEN ÖZDEMİR Z., ESMER K.This study focuses on the improvement of ac electrical properties of epoxy polymer matrix for energy storage applications by reinforcing it with WO3 micro particles. The Bragg diffraction peaks represents to the triclinic structure of WO3 particles. The particle dimensions are between 600 and 800 nm. The samples have been prepared by using the mixture of liquid bisphenol A-epichlorohydrin epoxide resin and isophorone diamine in 2:1 ratio. To prepare composites, µ-WO3 have been added at a rate of 5%, 10%, 20%, and 30% by mass. Electrical investigation of epoxy composites containing WO3 included the real and imaginary components of complex permittivity function, loss tangent, the real and imaginary components of complex electrical modulus, and conductivity in the frequency range of 20 Hz-15 MHz. As a result, it has been determined that among other composites, the composite having 20% WO3 particle addition has the highest Ɛ´ and Ɛ´´ values in the low frequency range. On the other hand, compared to pure epoxy, the highest conductivity values have been observed in ac conductivity in the mid and low frequency regions with 20% and 30% WO3 additives, respectivelyPublication Open Access Structural and dielectrical behavior of polypyrrole/huntite composites(2023-04-01) MADAKBAŞ, SEYFULLAH; ŞAHİN, NAZLICAN; ESMER, KADİR; Madakbaş S., Şahin N., Türk Z., Esmer K., Şen F.In order to characterize stable composites that will contribute to industrial applications, polypyrrole (PPy)/huntite composites were prepared by the physical method. Polypyrrole (PPy)/huntite composites were produced at various huntite concentrations (10, 20, 30, 40 wt.%). Polypyrrole/huntite was characterized by Fourier transform infrared spectroscopy (FTIR), Thermal Gravimetric Analyses (TGA), Differential Thermal Analyses (DTA), Scanning electron microscopy (SEM), and dielectrical properties were investigated by Impedance Analyzer at the room temperature. The FTIR spectra show that huntite mineral coordinate with polymers through carbonate groups. TGA results indicate the main cause of mass loss can be moisture in the samples and unreacted pyrrole monomer. SEM images show that the composites have a granular and spherical geometry. Dielectric measurements showed that at lower frequencies dielectric constants decrease exponentially with an increase in frequency and this behavior indicates that the effect of interfacial polarization becomes more predominant at a lower frequency.