Comparison of Redox Initiators Reactivities in the Grafting of Methyl Methacrylate onto Chitin

Yazdani‐Pedram, Mehrdad; Lagos, A.; Campos, Nina Horwitz; Retuert, Jaime

doi:10.1080/00914039208034811

Cited by 28 publications

(17 citation statements)

References 25 publications

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“…Enhanced affinity of grafted chitin for some organic solvents was observed in this case 39) . Regarding the modification of chitosan, we studied the grafting of methylacrylate and methylmethacrylate in a heterogeneous medium by using potassium persulfate in combination with a number of organic and inorganic reducing agents such as cocatalysts.…”

Section: Introductionmentioning

confidence: 91%

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Hydrogels based on modified chitosan, 1. Synthesis and swelling behavior of poly(acrylic acid) grafted chitosan

Yazdani‐Pedram¹,

Retuert²,

Quijada³

2000

Macromol. Chem. Phys.

124

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Section: Introductionmentioning

confidence: 91%

“…As we have previously observed, the extent of grafting vinyl monomers onto cellulose, chitin, chitosan, etc. is very sensitive towards reaction conditions 16,21,39,40) . Therefore, a systematic study of the effect of different reaction variables on grafting of acrylic acid onto chitosan, is presented in this work.…”

Section: Introductionmentioning

confidence: 99%

Hydrogels based on modified chitosan, 1. Synthesis and swelling behavior of poly(acrylic acid) grafted chitosan

Yazdani‐Pedram¹,

Retuert²,

Quijada³

2000

Macromol. Chem. Phys.

124

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“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Elkholy

Khalil

Elsabeé

et al. 2006

J of Applied Polymer Sci

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Modification of chitosan by grafting with vinyl acetate (VAc) was carried out using potassium persulfate and sodium bisulfite as redox initiators. The effect of monomer, initiator concentration, time, and temperature was studied. The grafted samples were subjected to alkaline hydrolysis and the polyvinyl acetate (PVAc) branches were consequently partially converted into polyvinyl alcohol (PVAl) graft, which showed enhanced swelling in water. The graft copolymers showed a better dye uptake for both acidic and basic dyes. Chitosan/VAc and chitosan/VAl copolymers were both subjected to reaction with dimethyl sulfate in alkaline medium to yield quaternized copolymers. The antifungal behavior of chitosan and its graft copolymers was investigated in vitro on the mycelial growth, sporulation, and germination of conidia or sclerotia of the following sugarbeet: Beta vulgaris pathogens isolated in Egypt, Rhizoctonia solani Kü hn (AG 2-2 ) Sclerotium rolfsii Sacc. and Fusarium solani (Mart.) Sacc. These polymers were also screened against several fungi and it has been found that grafting with polyvinyl alcohol branches enhances the antifungal activity dramatically.

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“…Redox initiators like Fenton's reagent, potassium persulfate, and cerium (IV) ammonium nitrate (CAN) have been found to be effective for this purpose. [2][3][4] Acylation, aldimination, carboxymethylation, sulfation, butyrilation, and formylation of chitin or chitosan have been achieved through classical methods of organic synthesis. [5][6][7] Sashiwa and Shigemasa [8] prepared N-acylated chitosan derivatives soluble at various pH values via ring opening reactions with various cyclic anhydrides in aqueous methanol system.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Maleic Acid Grafted Chitosan

Hasipoğlu

Yilmaz

Yılmaz

et al. 2005

International Journal of Polymer Analysis and Characterization

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Modification of chitosan (CHI) with maleic acid (MA) via maleic anhydride (MAn) was investigated in acetic acid solution, in the presence of cerium ammonium nitrate (CAN) as the initiator. The effects of reaction time, temperature, and CAN and MA concentrations on the grafting percentage were studied. The products were characterized by Fourier-transform infrared, differential scanning calorimetry, and 13 C NMR, in addition to gravimetric evidence to grafting. A maximum of 105% grafting was achieved under the reaction conditions of 0.12 M CHI, 2.0 M MA, and 0.091 M CAN by stirring for 3 h at 70 C. Dissolution and swelling properties of grafted products were tested in the pH range 3-11. Products up to 36.5% grafting were found to be soluble in aqueous solution, while those with higher grafting percentages (48-81%) were partly soluble in the pH range studied. The product with maximum grafting percentage (105%) swelled and acted as a polyampholyte gel.

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Comparison of Redox Initiators Reactivities in the Grafting of Methyl Methacrylate onto Chitin

Cited by 28 publications

References 25 publications

Hydrogels based on modified chitosan, 1. Synthesis and swelling behavior of poly(acrylic acid) grafted chitosan

Hydrogels based on modified chitosan, 1. Synthesis and swelling behavior of poly(acrylic acid) grafted chitosan

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

Preparation and Characterization of Maleic Acid Grafted Chitosan

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