Grafting onto chitosan. I. Graft copolymerization of methyl methacrylate onto chitosan with Fenton's reagent (Fe²⁺−H₂O₂) as a redox initiator

Abstract

SynopsisPoly(methy1 methacrylate) has been grafted onto chitosan by using Fenton's reagent as a redox initiator in an aqueous medium. Initiation by Fenton's reagent was carried out in the presence of atmospheric oxygen. The percentages of grafting, efficiency, and homopolymer were found to depend on chitosan (RchitOH), ferrous ammonium sulfate (FAS), hydrogen peroxide, monomer (MMA) concentrations, reaction temperature, and reaction time.This waste can be minimized by controlling the (Fe2+) : (H20,) ratio. Evans et al.15 reported that the 'OH generated in eq. (1) is capable of initiating vinyl polymerization. Merz and Waters" suggest that ' OH produced in eq. (1) can be used for grafting vinyl monomers onto cellulose; this fact was proved by Richards' and Bridgef~rd.'~ Chitosan, poly~(l-4)-2-amino-2-deoxy-D-glucose, a product of de-N-acetylation of chitin,'* has been used in the radical polymerization of methacrylic

Adsorption of anionic dyes on chitosan grafted poly(alkyl methacrylate)s

“…The gravimetric analysis has been effectively used to determine grafting percentage in previous studies [12,18,19] and the percentage of grafting (%G) was calculated gravimetrically, using the following equation.…”

Chitosan: The Most Valuable Derivative of Chitin

“…Moreover, there are several reports regarding the use of enzymes in polymer synthesis and modification [120][121]. In fact, enzymes offer the potential advantage of eliminating the hazards associated with reactive reagents and because of their specificity they offer the potential for precisely modifying macromolecular structure to better control polymer function.…”

Grafting of vinyl acetate onto chitosan and biocidal activity of the graft copolymers

“…Acrylamide was also used to produce graft copolymer with crosslinked chitosan for controlled drug release. 10 Grafting of chitosan was performed with acrylonitrile, 11 vinyl acetate, 12,13 methyl methacrylate, 11,14,15 hydroxyelthyl methacrylate, HEMA 16,17 ; HEMA was also plasma-induced grafted to chitosan to produce membranes, 18 vinylpyridine, 19,20 methyl acrylate. 19,20 Chitosan-graft-polystyrene, prepared by radiation induced method, showed higher adsorption of bromine than chitosan.…”