Publications Scientifiques

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Author: search.filters.author.Belhaneche-Bensemra, NaimaHas files: No

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    Study of the interfacial adhesion between alfa fiber and synthetic resin in a new biocomposite material
    (Elsevier, 2022) Kadem, Sihem; Irinislimane, Ratiba; Belhaneche-Bensemra, Naima
    The Interfacial adhesion between fiber and resin has a strong influence on composite mechanical performance and thermal stability. Natural fibers like alfa have attracted a great interest to be used as reinforcement for polymer composites. In this work biocomposites were prepared from natural substances by bleinding alfa plants (Stipa tenacissima) as natural reinforce fibers and modified sunflower oil (Helianthus annuus) as synthetic resin. The application of alfa fibers as reinforcement for composites requires a strong adhesion between the fibre and the resin. In the present work, alfa fibers were added to the synthetic resin after alkaline treatment with 5% NaOH solution. Biocomposites were prepared by using treated and untreated alfa fibers and characterised in terms of tensile properties, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The results showed a good interfacial adhesion between treated alfa fibers and the resin. On the other hand, a thermal improvement was observed for biocomposites with treated alfa fibers
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    Analysis and quantitative estimation of phenolic antioxidants in polypropylene packaging for fat products
    (Freund Publishing House, 2018) Baloul, Hakim; Belhaneche-Bensemra, Naima; Bernaldo De Quirós, Ana Rodriguez; Sendon, Raquel
    The aim of this work was to study the interactions between polypropylene (PP) food packaging for fatty products (margarine) and food simulant. For this purpose, a simulant (olive oil) was used in two different temperatures (20°C and 40°C). The interaction phenomena were investigated according to the rate of mass variation of PP samples with time and by using Fourier transform infrared spectroscopy, scanning electron microscopy and high-performance liquid chromatography (HPLC). The results showed the presence of two phenomena – migration of additives and sorption of the simulant, with the phenomena more pronounced at 40°C. Furthermore, the HPLC analysis identified the presence of Irganox 1010 and Irgafos 168 as antioxydants and allowed to carry out a kinetic study of Irganox 1010 migration. The concentration of Irganox 1010 decreased from 13.35 to 4.76 mg/kg at a temperature of 40°C and to 5.85 mg/kg at a temperature of 20°C after 10 days of contact with olive oil. The Irgafos 168 migration could not be evaluated because it is very sensitive to oxidation.
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    Investigation of the Biodegradability of LDPE/PLA Bioblends: Comparison of Hydrolysis and Soil Burial Tests
    (DESTECH PUBLICATIONS, 2015) Boubekeur, B.; Amrouche, Y.; Belhaneche-Bensemra, Naima; Massardier, V.
    The present work concerns the preparation and characterization of new biodegradable materials by mixing poly lactic acid (PLA), a biodegradable polymer, with low density polyethylene (LDPE), a current thermoplastic that can be bio-based. For that purpose, LDPE/PLA blends of variable composition (100/0, 80/20, 50/50, 20/80, 0/100) were prepared. They were characterized in terms of physical properties (density, melt flow index), thermal properties (melting temperatures) and mechanical properties (tensile and Shore D hardness). Their morphology was investigated by scanning electron microscopy. Hydrolysis and soil burial tests were conducted to study the biodegradation behavior. The weight loss of the samples with time was followed. The structural changes were investigated by FTIR spectroscopy and microscopic observation. Mechanical analysis showed that the strength at break increased with the level of PLA while the elongation at break decreased strongly due to the non miscibility of the two polymers. The SEM micrograph of blends 20/80, and 80/20 evidenced poor adhesion at the interface between the two polymers. The PLA confers a brittle character to its blends. The highest rates of mass variation were observed for the blend containing 50 and 80 wt% of PLA and were about 72 and 55 wt% after 45 days for the hydrolysis test and 10 and 2.5 wt% after 18 weeks of soil burial.