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    Effect of Barium Titanate on the Mechanical and Piezoelectric Performance of Natural Rubber-Based Composites
    (Wiley-V C H Verlag Gmbh, 2025) Yildiz, Gorkem; Ozdemiryurek, Ege; Kurtlu, Meral Akkoyun
    The effects of barium titanate (BaTiO3) filler on the rheology, mechanical, and piezoelectric properties of natural rubber (NR) based industrial rubber mixture were investigated. The results revealed lower time to reach 90% curing (tc90) and lower tensile strength and elongation at break values for BaTiO3-filled rubber composites compared to the pure rubber mixture. The piezoelectric charge constant (d(33)) and the generated voltage of BaTiO3-filled rubber composites increased up to 3 pC/N and 120 mV, respectively, for a total filler content of 40 vol.% with the increase of the filler content.
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    Thermal and electrical properties of aluminum nitride/boron nitride filled polyamide 6 hybrid polymer composites
    (Wiley, 2021) Yildiz, Gorkem; Akkoyun, Meral
    The effects of boron nitride (BN) and aluminum nitride fillers on polyamide 6 (PA6) hybrid polymer composites were investigated. In particular, the thermal and electrical conductivity, thermal transition, thermal degradation, mechanical and morphological properties and chemical bonds characteristic of the materials with crystal structure of BN and aluminum nitride (AlN) filled PA6 prepared at different concentrations were characterized. Thermal conductivity of hybrid systems revealed a 1.6-fold gain compared to neat PA6. The highest thermal conductivity value was obtained for the composite containing 50 vol% additives (1.040 W/m K). A slight improvement in electrical conductive properties of composites appears and the highest value was obtained for the 50 vol% filled composite with only an increase by 3%. The microstructure of these composites revealed a homogeneous dispersion of AlN and BN additives in PA6 matrix. For all composites, one visible melting peak around 220 degrees C related to the alpha-form crystals of PA6 was detected in correlation with the X-ray diffraction results. An improved thermal stability was obtained for 10 vol% AlN/BN filled PA6 composite (from 405.41 degrees C to 409.68 degrees C). The tensile strength results of all composites were found to be approximately 22% lower than pure PA6.