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Subject: search.filters.subject.Acrylic acid

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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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    Grafting of acrylic monomers onto cellulose. Influence on fibre absorbency
    (2005) Aliouche, D.; Djelali, Nacer-Eddine
    The 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 samples