Publications Scientifiques

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Author: search.filters.author.Aliouche, DjamelHas files: No

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    Synthesis, characterization and rheological behavior of pH sensitive poly(acrylamide-co-acrylic acid) hydrogels
    (Elsevier B.V., 2017) Seddiki, Nesrinne; Aliouche, Djamel
    Poly(acrylamide-co-acrylic acid) poly(AAm-co-AAc) hydrogels were prepared by free radical polymerization initiated by redox initiators of ammonium peroxodisulphate (APS) and N,N,N′,N′-tetramethyl ethylene diamine (TEMED); N,N′-methylene bisacrylamide (BIS) was employed as a crosslinking agent. The copolymers were characterized by infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), dynamic rheology and swelling measurements. Results indicated that the strong interaction in the hydrogels resulted in the formation of a more stable copolymer. The single glass transition temperature (Tg) in sample suggested that the two polymers into the hydrogel have a good miscibility. The elastic modulus (G′) and linear viscoelastic region increased with increase in PAAc concentration. The oscillation time sweep study of the hydrogels exhibited a flat G′ indicating a stable structure and good mechanical strength. In the swelling measurements, the gels exhibited appreciable water uptake and were highly sensitive to pH environment. So the poly(AAm-co-AAc) hydrogel will have promising application in pharmaceutical use and in biomaterials
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    Study of the effect of UV aging on the mechanical properties of a geotextile based on polypropylene
    (American Institute of Physics Inc, 2018) Ghemati, Djamila; Rafa, Nadia; Aliouche, Djamel
    The main objective of this work is to study the effect of aging by UV radiation on the physical and mechanical properties of two types of polypropylene-based non-woven geotextiles. First, a study of the physical, mechanical characteristics was carried out, followed by an aging test by ultraviolet radiation as a function of time in order to evaluate their mechanical characteristics before and after aging using standard tests. The results obtained show that: the mechanical properties such as the tensile strength of a geotextile depend on its areal density and its thickness, so the resistance to static and pyramidal punching increases with increasing geotextile thickness. A significant loss in tensile properties (tensile strength and elongation at break) of about 50% for a time of exposure of geotextiles to UV radiation for 300 h. Finally, it can be concluded that polypropylene geotextiles are sensitive to ultraviolet radiation. Therefore, in order to increase the service life of a geotextile, it is necessary to avoid exposure to light during storage and processing, or to add a stabilizer
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    Biotreatment on cellulose fluff pulp : quaternary ammonium salts finish and grafting with β -cyclodextrin
    (2009) Ghemati, Djamila; Aliouche, Djamel; Oudia, Atika; Lamouri, Saad
    For its potential performances to be expanded, cellulose needs to be processed in different ways. Therefore, an object of the present work was to provide a chemical modification of cellulose through: a specific finish with two quaternary ammonium salts (namely Aliquat 336 and Aliquat 1529, respectively). Chemical grafting of β -cyclodextrin derivative ( β -CD) onto fibers followed by the inclusion of benzoic acid in the grafted CD cavities as a probe chemical. Physicochemical properties and performances of the untreated and treated fibers have been determined with infrared spectra, microscopy, swelling measurements, antimicrobial finishing tests, and dye adsorption. Our results show that cellulose fibers can be efficiently modified with no significant changes in its structural and surface properties; the treated fibers show an attractive behavior in swelling, dye adsorption and antibacterial activity