title: Free radical grafting kinetics of acrylamide onto a blend of starch/chitosan/alginate.
abstract: Grafting of monomer onto polymer backbone is one of the effective and accessible methods for the chemical modification of polysaccharides. Grafting of acrylamide (AAm) onto polysaccharides blend (PsB) composed of starch, chitosan and alginate has been carried out using potassium persulfate (KPS) as an initiator. The kinetics of the grafting polymerization also has been studied. The grafting parameters have been evaluated by changing the initial concentrations of AAm from 8 to 16 g, PsB from 6 to 14 g and KPS from 0.2 to 1 g. Evidence of grafting has been obtained from FTIR, XRD and TGA. The kinetics of the grafting polymerization also has been studied. The grafting rate equation of the produced hydrogel (PsB-g-AAm) hydrogel has been expressed by: Rg=k[AAm] [PsB](0.5) [KPS](0.5). The grafting rate is a first order dependence to [AAm] initial concentration and square root to [PsB] and [KPS] initial concentrations in the used concentrations range.
authors.affiliation: Chemical Engineering and Pilot Plant Department, National Research Center, Cairo, Egypt.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Sorour
authors.forename: Marwa
authors.initials: M
authors.lastname: El-Sayed
authors.forename: Nabil Abd
authors.initials: NA
authors.lastname: El Moneem
authors.forename: Hala
authors.initials: H
authors.lastname: Talaat
authors.forename: Hayam
authors.initials: H
authors.lastname: Shaalan
authors.forename: Sahar
authors.initials: S
authors.lastname: El Marsafy
mesh_terms: D020106:Acrylamide / Q000737:chemistry*; D000464:Alginates / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D005609:Free Radicals / Q000737:chemistry; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D020100:Hydrogels / Q000737:chemistry; D007700:Kinetics; D013213:Starch / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D000464:Alginates; D005609:Free Radicals; D006603:Hexuronic Acids; D020100:Hydrogels; D014867:Water; D020106:Acrylamide; D020723:Glucuronic Acid; D013213:Starch; D048271:Chitosan
keywords: Acrylamide; Graft polymerization; Kinetics; Starch