Publications Internationales

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    Preparation and biological characterization of cellulose graft copolymers
    (Elsevier, 2010) Dahou, Wassila; Ghemati, Djamila; Oudia, Atika; Aliouche, Djamel
    Acrylic acid (AA) and acrylonitrile (AN) were graft polymerized onto cellulose fluff pulp using cericammonium nitrate as initiator. The resulting copolymers were saponified with dilute sodium hydroxide and characterized by FT-IR, SEM and TGA. The potential value of the modified cellulose was assessed through measurements of absorbency properties. A fibre-hydrogel was prepared by an addition of a bifunctional monomer, ethyleneglycol dimethacrylate (EDMA) used for grafting. In second approach, biocide cellulose carbamate was prepared by impregnating the fibres in aqueous thiourea solution and subsequent grafting with acrylonitrile. Antimicrobial activity of the treated cellulose sample was studied against Escherichia coli, Pseudomonas aeruginosa and Bacillus subtilis according to AATCC test method 100–1999. The results show that the treated fibre gives higher antimicrobial activity. The strong antimicrobial functions achieved on modified fibres, proved that the synthesized biomaterial was effective, very simple and practical to the textile finishing industry
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    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 samples