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Browsing by Author "Mitchell, Geoffrey Robert"

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  • Time-resolving study of stress-induced transformations of isotactic polypropylene through wide angle X-ray scattering measurements
    Publication . Auriemma, Finizia; De Rosa, Claudio; Di Girolamo, Rocco; Malafronte, Anna; Scoti, Miriam; Mitchell, Geoffrey Robert; Esposito, Simona
    The development of a highly oriented fiber morphology by effect of tensile deformation of stereodefective isotactic polypropylene (iPP) samples, starting from the unoriented form, is studied by following the transformation in real time during stretching through wide angle X-ray scattering (WAXS) measurements. In the stretching process, after yielding, the initial form transforms into the mesomorphic form of iPP through mechanical melting and re-crystallization. The analysis of the scattering invariant measured in theWAXS region highlights that the size of the mesomorphic domains included in the well oriented fiber morphology obtained at high deformations increases through a process which involves the coalescence of the small fragments formed by effect of tensile stress during lamellar destruction with the domain of higher dimensions.
    2018Journal article Open access Show more
  • Ultrasound assisted synthesis of polylimonene and organomodified-clay nanocomposites: A structural, morphological and thermal properties
    Publication . Derdar, Hodhaifa; Mitchell, Geoffrey Robert; Cherifi, Zakaria; Belbachir, Mohammed; Benachour, Mohamed; Meghabar, Rachid; Bachari, Khaldoun; Harrane, Amine
    Polylimonene-clay nanocomposites (PLM-Mag 2, 3, 6 and 10% by weight of clay) were prepared by mix-ing Maghnite-CTA+ (Mag-CTA+) and polylimonene (PLM) in solution using ultrasonic irradiation. The catalyst preparation method were studied in order to determine and evaluate their structural, morpho-logical and thermal properties. The Mag-CTA+ is an organophylic montmorillonite silicate clay pre-pared through a direct exchange process, using green natural clay of Maghnia (west of Algeria) called Maghnite. The Algerian clay was modified by ultrasonic-assisted method using cetyltrime-thylammonuim bromide (CTAB) in which they used as green nano-reinforcing filler. Polylimonene was obtained by the polymerization of limonene, using Mag-H+ as a catalyst. The morphology of the ob-tained nanocomposites was studied by X-ray diffraction (XRD), scanning electronic microscopy (SEM), transmission electronic microscopy (TEM) and infrared spectroscopy (FT-IR). Thermogravimetric anal-ysis (TGA) shows that the nanocomposites have a high degradation temperature (200−250 °C) com-pared with the pure polylimonene (140 °C). The analyses confirmed the chemical modification of mont-morillonite layers and their uniformly dispersion in the polylimonene matrix. Exfoliated structures were obtained for low amounts of clay (2 and 3% by weight), while intercalated structures and immisci-ble regions were detected for high amounts of clay (6 and 10% by weight).
    2020Journal article Open access Show more