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A. M. Rashad

Bio: A. M. Rashad is an academic researcher from Egyptian Atomic Energy Authority. The author has contributed to research in topics: Irradiation & Fourier transform infrared spectroscopy. The author has an hindex of 1, co-authored 1 publications receiving 1 citations.

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TL;DR: In this article, a blend of polycarbonate (PC)/polybutylene terephthalate thin films was used to detect gamma-rays with different doses (55 −355 kGy).
Abstract: In this study, blend of polycarbonate (PC)/polybutylene terephthalate thin films was used. This blend belongs to the class of polymeric solid-state nuclear track detectors. Blend samples were exposed to gamma-rays with different doses (55–355 kGy). The compositional changes, the changes of optical properties, the electrical parameters changes and surface morphology in the gamma irradiated samples were studied. Different techniques were used to study improving the physicochemical properties of the irradiated samples, such as Fourier transform infrared spectroscopy, UV–Visible spectroscopy, LCR Meter Bridge and scanning electron microscope, as well as, the roughness testing. Fourier transform infrared measurements exhibit that the degradation in the polymer chain occurs after irradiation with gamma-rays. This means that some functional groups are the most sensible groups to gamma-rays. UV–Visible spectra of the gamma exposed samples exhibited a shift in the absorbance edge toward the region of higher wavelength. This trend reflects a decrease in the band gap energy, which leads to an increase in the electrical conductivity of the samples. The outcomes of dielectric loss and dielectric constant are sensible parameters for whole frequency range to the changes in the structural and optical behaviors as a result to gamma irradiation. Additionally, the surface changes were discussed.

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TL;DR: In this paper , structural and optical characterizations of gamma-irradiated poly allyl diglycol carbonate (PADC) have been analyzed using Gas Chromatography-Mass Spectrometry (GC-MS), X-ray diffraction (XRD) diffractometer, Fourier Transform Infrared (FTIR) spectra and UV/Vis Spectroscopy.
Abstract: The investigation of fragment products, structural and optical characterizations of gamma-irradiated Poly Allyl Diglycol Carbonate (PADC) has been analyzed. Gas Chromatography–Mass Spectrometry (GC–MS), X-ray diffraction (XRD) diffractometer, Fourier Transform Infrared (FTIR) Spectroscopy and UV/Vis Spectroscopy have been applied to analyze alterations of PADC polymeric solid state track detector for the understanding the mechanisms of produced alterations by gamma-irradiation. The obtained results show that the irradiated PADC samples contain induced fragment products by gamma radiation. The GC-MS analysis shows that the pristine sample has one compound product with a clear peak of ethylene glycol (EG), but for irradiated samples two compound fragmentation products appeared ethylene glycol (EG) and diethylene glycol (DEG) with different areas %. This is theoretically confirmed, by density functional theory (DFT) using Spartan’20 parallel suite for PADC in neutral and ionized states. The XRD results reveal that the molecules ordering/disordering of irradiated samples have been influenced by gamma exposure according to the values of exposure doses. This increase in disordering is due to the degradation of the polymer chains. An induced change in the band intensities have been observed in FTIR spectra, which indicate to the cleavage in the C–H bond after irradiation. The optical properties studies illustrate that significant modification in the band gap energies after irradiation.