Browsing by Author "Doufnoune, R"

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    EFFECTS OF MAGHNITE NANOCLAY MODIFICATION AND COMPATIBILIZATION ON THE PHYSICAL AND MORPHOLOGICAL PROPERTIES OF POLY(VINYL CHLORIDE)/POLY(ETHYLENE-CO-VINYL ACETATE) BLENDS
    (university of el oued/جامعة الوادي, 2019-01-01) Bouaziz, I; Doufnoune, R; Haddaoui, N; Benachour, D; Baltä-Calleja, F. J
    In this research work poly(vinyl chloride)(PVC), ethylene vinyl acetate copolymer (EVA), and Maghnite nanoclay (MGT) were used to prepare PVC/EVA nanocomposites. The MGT clay was intercalated with octadecyltrimethylammonium chloride (ODTMA) and grafted with γ-aminopropyltriethoxysilane (APTES). The blend nanocomposites were prepared through the melt mixing of PVC/EVA blend at a weight ratio of 50/50 (wt%/wt%) with 20 wt% of compatibilizer; ethylene vinyl acetate grafted with an alcohol (EVA-g-OH) and 3 wt% of modified MGT clay using a Brabender plastograph. The nanocomposites so prepared were characterized using X-ray diffraction, TGA/DTA, mechanical tests and SEM. The results showed that when PVC was blended with EVA, with the modified MGT and with the compatibilizer, synergistic effects in the thermal stability and mechanical properties were observed.
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    PREPARATION AND CHARACTERIZATION OF POLYPROPYLENE/ PLASTICIZED CORN STARCH BLENDS: EFFECT OF ORGANO-MAGHNITE CLAY AND COMPATIBILIZER ON THE MORPHOLOGICAL, MECHANICAL AND THERMAL PROPERTIES
    (university of el oued/جامعة الوادي, 2018-09-01) Smail, D; Djellouli, B; Ourari, A; Doufnoune, R; Fleutot, S
    A biobased nanocomposite was prepared from polypropylene (PP) and thermoplastic starch (TPS). Different percentages of polypropylene-grafted-maleic anhydride are added to the two phases to improve their compatibility. This system was reinforced with organoclay, modified by alkylammonium. The compatibilizer effect and TPS on morphology and properties of PP/organoclay nanocomposites obtained by melt compounding are studied. A good dispersion of filler into polymer matrix is demonstrated by X-ray diffraction. Exfoliated structure with improved compatibility between PP and TPS are obtained using MA-g-PP compatibilizer. Scanning electron microscopy proved strong interfacial adhesion between the components. 7% wt of MA-g-PP compatibilizer and 30% wt of TPS without compatibilizer induce an increase in modulus. Tensile strength and elongation decreased in all materials. TGA-DTA showed an increase in decomposition temperature of compatibilized materials.
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    SURFACE MODIFICATION OF SILICA NANOPARTICLES BY MEANS OF SILANES: EFFECT OF VARIOUS PARAMETERS ON THE GRAFTING REACTIONS
    (university of el oued/جامعة الوادي, 2019-01-01) Bounekta, O; Doufnoune, R; Ourari, A; Riahi, F; Haddaoui, N
    The adsorption of four silanes, namely: N-(2-Aminoethyl)-3-aminopropyltrimethoxysilane (AEAPTMS), 3-methacryloxypropyltrimethoxysilane (MPTMS), allyltrimethoxysilane (ATMS), N-2-[(N-vinylbenzylamino)ethyl]-3-aminopropyltrimethoxysilane hydrochloride (CVBS) onto the surface of silica nanoparticles has been studied using water/ethanol (5/95, v/v) mixture. Four experimental parameters were explored for the grafting of the silanes: pH, concentration, time, and temperature. Possible interactions between the silanes and the surface of silica were investigated by means of FT-IR Spectroscopy. The FT-IR analyses confirmed the effectiveness of the silanization of the silica surface. The amount of the adsorbed silane on the silica nanoparticles appeared to be influenced by the initial concentration of the silane, pH, time and temperature of modification.