Publications Scientifiques
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Item The Effects Of Long Time Exposure To Natural Weather On The Rheological And Morphological Properties Of Polypropylene/polyamide-6 Blends(Université M'hamed Bougara de Boumerdès, 2013) Mouffok, Samir; Kaci, M.; Peuvler-Disdier, E.; Aliouche, D.The effects of natural weatheringexposure for a period of one year on the properties of polypropylene (PP)/polyamide-6 (PA6): (70/30 wt%) blends have been investigated in the absence and the presence of PP-g-MA used as a compatibilizer . The resulted changes in morphology and rheological properties of the different blends were studied by means of scanning electron microscopy (SEM), melt flow indextest(MFI)and rheometry.After one year of natural weathering exposure, the results showed a significant increaseof MFIvalues all the samples.The rheological measurements indicated a decrease in the complex viscosity of PP, PA6 and their blends as a result of chain scission mechanism; however, the decrease was more pronounced bythe addition of the compatibilizerat this stage of time exposure.Further, the weathering effect on the morphology of exposed PP/PA6 observed by SEM revealed the presence of voids and cracks on the fractured surfaces for both virgin and compatibilized blends.Item Etude de l’adsorption des composés phénoliques sur des membranes polymères à base de poly (vinyl alcool) /β-cyclodextrine(Aljest, 2018) Ghemati, D.; Aliouche, D.L’objectif principal de ce travail est l’étude de d’adsorption des polluants aromatiques: 2- chlorophénol, 2-nitrophenol sur des membranes à base des polymères polyvinylalcool modifiées par la cyclodextrine. Pour cela des membranes à base de polyvinylalcool réticule avec le glutaraldehyde (PVA/GA) ont été préparés, puis l’incorporation de la β-Cyclodextrine dans ces membranes ((PVA / GA / β-CD) à différentes compositions (2, 4, 6, 8% β-CD) a été réalisé. La synthèse a été confirmée par analyse spectroscopique infra rouge (FTIR). Et le comportement du gonflement des membranes a été étudié. Enfin, Les expériences d’adsorption des composés phénoliques ont été réalisées dans des solutions aqueuses. Les résultats d’adsorption à différent pH indiquent que le maximum de la capacité d’adsorption est obtenu à pHItem Synthesis, rheological behavior and swelling properties of copolymer hydrogels based on poly(n-isopropylacrylamide) with hydrophilic monomers(2013) Seddiki, Nesrinne; Aliouche, D.In this study, hydrogels of poly(N-isopropylacrylamide-co-acrylamide) and poly(N-isopropylacrylamide-co-acrylic acid) having a thermoresponsive character were prepared by aqueous free-radical co-polymerization using the ammonium persulfate/N,N,N', N'-tetramethylethylenediamine (APS/TEMED) redox-pair initiator system in the presence of N,N'-methylenebisacrylamide (MBAAm) crosslinker. (NIPAAm-co-AAm) and (NIPAAm-co-AAc) hydrogels with different thermoresponsive properties were obtained by fixing the initial NIPAAm/AAm mole ratio and and (NIPAAm-co-AAc) mole ratio to 80/20 and changing the crosslinker concentration. The copolymers were characterized with infrared spectroscopy (IR) and differential scanning calorimetry (DSC) techniques. The swelling response of the copolymers networks as a function of time, temperature and swelling environment has been observed to be dependent on both structural aspects of the polymers and swelling environment. The swelling has been observed to be decrease with increase in MBAAm in the copolypolymers networks. Rheological behavior was studies in oscillatory module. All copolymers have a viscoelastic behaviour. We note that the elastic modulus G' increases with increasing hydrophilic monomersItem Mechanical and tactile compression of fabrics: Influence on handle(Textile Research Journal, 2000) Aliouche, D.; Viallter, P.The classical interpretation of fabric friction is viscoelastic, but its correlation with compression curves is poor. Measurements show that at low pressures, friction essentially depends as much on fabric hairiness as on compression. The limit of compressibility is a function of the yarn arrangement, the yarn structure itself being less important. We explain the difference between a film and a fabric, and also the influence of the mass per unit of surface. The results show the influence of surface finishes on the handle of clothItem Influence of natural weathering on the physical properties of compatibilized blends of poly(propylene)/polyamide-6(Wiley Online Library, 2012) Mouffok, Samir; Kaci, M.; Peuvler-Disdier, E.; Aliouche, D.Item Study of the aluminum cation resulting from anodic dissolution in nonaqueous medium(2005) Djelali, Nacer-Eddine; Aliouche, D.; Pierre, G.Dans ce travail, le degré d'oxydation des cations métalliques -d'aluminium- obtenus électrochimiquement en milieu non complexant a été déterminé par coulométrie, gravimétrie et spectrophotométrie d'absorption atomique. Al+ formé est oxydé en Al3+ par l'ion ClO-4Item Grafting of acrylic monomers onto cellulose. Influence on fibre absorbency(2005) Aliouche, D.; Djelali, Nacer-EddineThe objective of our study is to show the importance of the chemical modification, by grafting, of cellulose in order to get a material with an improved absorption and retention. Acrylic monomers, acrylic acid (AA) and acrylonitrile (AN) were grafted onto cellulose by using a free radical process initiated by cerie ions. Fibrous supports used were: a Kraft fluff pulp, rayon fibers and short cotton fibers. Major factors affecting graft co-polymerization of acrylonitrile and acrylic acid onto cellulose, (surface morphology, initiation process, reaction temperature) were studied. The water absorption capacities and grafting values of modified cellulose were also determined. The maximum grafting yield was obtained at room temperature by using a CAN initiation technique. Saline solution (0,9% NaCI) absorbency was also studied, due to the counter ion effect retention of 0,9% aqueous NaCl was about 70% of the water retention value. The grafting has been confirmed by infrared analysis through the apparition of characteristic strips of monomers on spectrum of grafted samples. The absorbency of the grafted samples is significantly higher than that observed for the native cellulose. Acrylic functions grafted onto cellulose, have otherwise, improved liquid retention of samplesItem Graft-copolymerization of acrylic monomers onto cellulose. influence on fibre swelling and absorbency(2006) Aliouche, D.; Sid, B.; Ait-Amar, H.The objective of our study was to show the increasing importance of the chemical modification, by grafting, of cellulose in order to get a cellulose material with improved absorption and retention. Acrylic monomers, i.e. acrylic acid and acrylonitrile, were grafted onto cellulose fibres by using a free radical process initiated by two types of redox initiators: persulfate radicals (potassium persulfate, KPS) and ceric ions (ceric ammonium nitrate, CAN). The fibrous celluloses used were: a treated Kraft fluff pulp, rayon fibres (regenerated cellulose) and short cotton fibres (mill waste). Major factors affecting graft co-polymerization onto cellulose (surface morphology of cellulose, initiation process, reaction temperature and hydrolysis of grafted samples) were studied. The grafting has been confirmed by infrared analysis through the apparition of new characteristic lines of monomers on the spectra of grafted samples. The maximum grafting yield was obtained at room temperature by using a CAN initiation technique. Retention values and grafting yield were determined: due to counter ion effect, the retention of a 0.9 % NaCl solution was about 70 % of the water retention value. The swelling of grafted samples is significantly higher than that observed for the native cellulose. The acrylic functions grafted onto cellulose improved the liquid retention of samplesItem Cationic Polymerization of 1,3-dioxolane Using Sacrificial Anodes(2006) Djelali, Nacer-Eddine; Aliouche, D.; Daddi Oubeka, L.; Pierre, G.The electroinitiated polymerization of 1,3-dioxolane is carried out with metallic cationic initiators generated electrochemically V, Hg, Cr, Al