Cellulose membranes grafted with vinyl monomers in homogeneous system

Ibrahim, Maha M.; Flefel, Eman M.; El‐Zawawy, Waleed K.

doi:10.1002/app.10425

Cited by 21 publications

(10 citation statements)

References 38 publications

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“…However, upon further increase in the substrate concentration, increase in the reaction medium viscosity restricts the movements of macroradicals leading to decreased grafting percent and add-on values . It may also be attributed to deactivation of the macroradical growing chains (for example, by transfer reactions, combination and/or interaction with the primary radicals) soon after their formation (Pourjavadi et al, 2002;Ibrahim et al, 2002). Figure 8 shows the effect of reaction time on the grafting parameters.…”

Section: Effect Of Gelatin Concentrationmentioning

confidence: 99%

“…It is clear from this figure that reaction time increases with %Gr and %Ad gradually. The decrease in the %Gr and %Ad with time could be attributed to decrease in concentrations of initiator and the monomer as well as a reduction in the number of free radicals accessible for grafting as reaction proceeds (Ibrahim et al, 2002).…”

Section: Effect Of Gelatin Concentrationmentioning

confidence: 99%

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APS-initiated graft copolymerization of N-Vinyl pyrollidone onto gelatin: Preparation, characterization, and optimization of grafting parameters

Sadeghi¹,

Mohammadinasab²,

Shafie³

2012

Sci. Res. Essays

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In this work, large numbers of hydrophilic functional groups were introduced onto gelatin by grafting with N-vinyl pyrollidone monomer. The graft copolymerization reactions were carried out under nitrogen atmosphere using ammonium persulfate (APS) as an initiator. The graft copolymer was characterized by Fourier transform infrared spectra, thermo-gravimetric analysis and solubility test. The existence of a sharp intense peak at 1653 cm-1 in FTIR spectra of the graft copolymer, improvement of the thermal stability of gelatin-based copolymer and the solubility difference of the copolymer and the homopolymer prove the formation of graft copolymer. The effects of reaction variables, such as concentration of the initiator, monomer and gelatin, as well as, reaction temperature and time were investigated and the grafting conditions were optimized. The optimum reaction conditions resulting in maximum grafting ratio and add-on value have been determined.

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Section: Effect Of Gelatin Concentrationmentioning

confidence: 99%

Section: Effect Of Gelatin Concentrationmentioning

confidence: 99%

APS-initiated graft copolymerization of N-Vinyl pyrollidone onto gelatin: Preparation, characterization, and optimization of grafting parameters

Sadeghi¹,

Mohammadinasab²,

Shafie³

2012

Sci. Res. Essays

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“…However, in the case of homogeneous grafting, the graft copolymer is purified by precipitation and is characterized by some parameters such as grafting percentage (GP%), and grafting efficiency (GE%) [5]. The type of initiator used for grafting has an important effect because it determines the grafting percentage depending on the monomer to be used for grafting.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Vinyl Acetate Grafted onto Industrial Cellulose

Ekwunife¹,

Ajiwe²,

Odidika³

et al. 2020

SJC

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This study was aimed at investigating the synthesis and characterization of vinyl acetate grafted on Industrial Cellulose. Vinyl acetate monomer was grafted onto Industrial cellulose using benzoyl peroxide as initiator at varied temperatures. The Industrial cellulose-g-poly(vinyl acetate) was orange in colour. The effect of initiator concentration, monomer concentration and temperature on percentage grafting and grafting efficiency of the product was determined. Both percentage grafting and grafting efficiency increased with initiator concentration and monomer concentration for the industrial cellulose-g-poly(vinyl acetate). The percentage grafting and grafting efficiency increased with temperature from 60°C-70°C then decreased after 70°C for the sample. The graft copolymer was analyzed and characterized using various tests, which included Fourier transformed infrared spectrophotometer, physico-mechanical tests which were, hardness test with durometer shore hardness tester, density with Monsanto Densitron 2000, softening point tester with HDT/Vicat Test Station. Moreover, adsorption studies of bromothymol blue onto the sample was done with Ultraviolet-visible spectrophotometer. The results of the FTIR confirmed the presence of O-H of alcohol (3404 cm-1), C=O of esters (1645 cm-1), N-H of protein (2272 cm-1), C-H of methyl and methylene (2933 cm-1), and CO of esters (1122 cm-1) in the Industrial cellulose-g-poly(vinyl acetate). The result of the hardness showed that the Industrial cellulose-g-poly(vinyl acetate) was 87D, the density was 0.95mg/m 3 , and the softening point was 115°C-135°C. The percentage of bromothymol blue removed from aqueous solution was 72.4% for industrial cellulose-g-poly(vinyl acetate). The rate constants for the Industrial graft copolymer was determined using pseudo first order kinetics and it gave 3.59 x 10-2 min-1. The research showed that Industrial cellulose-g-poly(Vinyl acetate) could be used in the adsorption of bromothymol blue (dye) in aqueous solution.

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“…Graft copolymerization of hydrophilic vinyl monomers is a well-known technique employed by polymer chemists for significantly modifying the chemical and physical properties of the synthetic or natural starting materials with minimum degradation of the original properties [1][2][3][4][5] . Graft copolymers are prepared by first generating free radicals on the polysaccharide backbone and then allowing these radicals to serve as macroinitiators for the vinyl monomers.…”

Section: Introductionmentioning

confidence: 99%

Studies on Graft Copolymerization of 2-Acrylamido-2-methylpropanesulfonic Acid onto Protein Initiated by Ammonium Persulfate

Sadeghi¹,

Shafiei²,

Mohammadinasab³

2013

Asian J. Chem.

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The protein, collagen, has been chemically modified by graft copolymerization of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) in an aqueous medium using ammonium persulfate as an initiator under argon atmosphere. A plausible reaction mechanism of grafting has been suggested. Evidence of grafting was obtained by comparison of FTIR spectra of collagen and homopolymer-free collagen-gpoly(2-acrylamido-2-methylpropanesulfonic acid) as well as solubility characteristics and gravimetric analysis of the products. Evidence of grafting was obtained by comparing FTIR, thermogravimetric curves of collagen and the graft copolymer as well as solubility characteristics of the products. The synthetic conditions were systematically optimized through studying the influential factors including temperature, concentration of the initiator, 2-acrylamido-2-methylpropanesulfonic acid monomer and collagen substrate.

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Cellulose membranes grafted with vinyl monomers in homogeneous system

Cited by 21 publications

References 38 publications

APS-initiated graft copolymerization of N-Vinyl pyrollidone onto gelatin: Preparation, characterization, and optimization of grafting parameters

APS-initiated graft copolymerization of N-Vinyl pyrollidone onto gelatin: Preparation, characterization, and optimization of grafting parameters

Synthesis and Characterization of Vinyl Acetate Grafted onto Industrial Cellulose

Studies on Graft Copolymerization of 2-Acrylamido-2-methylpropanesulfonic Acid onto Protein Initiated by Ammonium Persulfate

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