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Characterization of unmodified and modified apricot kernel shell/epoxy resin biocomposites by ultrasonic wave velocities

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The main goal of this research was to develop highly durable, low-cost eco-friendly biocomposites from apricot kernel shell (AKS) wastes and ultrasonic characterization of AKS-based obtained biocomposites. Natural AKS wastes were chemically modified using 5 wt% sodium hydroxide (NaOH) and 99 wt% glacial acetic acid (AA). These modified apricot kernel shells (MAKS) and unmodified apricot kernel shells (UMAKS) were added into bisphenol-A type epoxy resin (ER) in varied compositions such as 10–50 wt% to prepare the MAKS/ER and the UMAKS/ER biocomposites. The epoxy resin-mixture in the weight ratios of resin/hardener/accelerator was 100:30:1. The effect of AKS powder ratios and modifiers on the elastic properties (Young’s moduli [E], bulk moduli [K], longitudinal moduli [L], shear moduli [G], and Poisson’s ratio [µ]), density (ρ), damping properties (attenuation coefficient [α], loss tangent [tanδ], and quality factor [Q]), ultrasonic micro-hardness (H), and acoustic impedance (Z) of biocomposites was investigated by the ultrasonic testing (UT) method. The morphological structure of the ER and biocomposites was figured out using scanning electron microscopy (SEM) and X-ray powder diffraction (XRD). The results revealed an increase in elastic properties of most of the AKS/ER biocomposites compared to the neat ER. On the other hand, results have shown that SEM and XRD images’ analysis confirmed the amorphous structure of ER and biocomposites. The highest ρ, vL, vS, L, G, E, H, and Z values were obtained in MAKS-AA/ER-5 biocomposite. Thus, it can be stated that the MAKS-AA/ER-5 biocomposite sample has the best mechanical properties. Also, the results revealed that the MAKS-AA/ER-1 sample can be used as an alternative material for its high Q-factor value instead of wood in producing musical tools.

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  1. Department of Physics Education, Necmettin Erbakan University, 42090, Konya, Turkey

    Imran Oral

  2. Department of Chemical Engineering, Konya Technical University, 42250, Konya, Turkey

    Suheyla Kocaman & Gulnare Ahmetli

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Oral, I., Kocaman, S. & Ahmetli, G. Characterization of unmodified and modified apricot kernel shell/epoxy resin biocomposites by ultrasonic wave velocities. Polym. Bull. 80, 5529–5552 (2023). https://doi.org/10.1007/s00289-022-04328-6

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