Graft Copolymerizations of Modified Cellulose. Grafting Acrylamide onto Carboxymethyl Cellulose

Okieimen, F. E.; Tame, Abel

doi:10.1080/10601329608020356

Cited by 2 publications

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“…Therefore, it is thought that carboxymethylation of cellulose might reduce the sites available for interaction with ceric ions and should be accompanied with low values of frequency of grafting. However, the extent of graft copolymer formation on carboxymethyl cellulose is higher than on unmodified cellulose 21, 22, 47, 48. It is pertinent to note that graft copolymerization on carboxymethyl cellulose is initially a homogenous process, whereas grafting onto unmodified cellulose is a heterogeneous process throughout the reaction period.…”

Section: Resultsmentioning

confidence: 99%

Preparation, characterization, and properties of cellulose–polyacrylamide graft copolymers

Okieimen¹

2003

J of Applied Polymer Sci

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Graft copolymers of acrylamide on cellulose materials (␣-cellulose 55.8%, DP 287.3) obtained from Terminalia superba wood meal and its carboxymethylated derivative (DS 0.438) were prepared using a ceric ion initiator and batch polymerization and modified batch polymerization processes. The extent of graft polymer formation was measured in graft level, grafting efficiency, molecular weight of grafted polymer chains, frequency of grafting as a function of the polymerization medium, and initiator and monomer concentrations. It was found that the modified batch polymerization process yielded greater graft polymer formation and that graft copolymerization in aqueous alcohol medium resulted in enhanced levels of grafting and formation of many short grafted polymer chains. Viscosity measurements in aqueous solutions of carboxymethyl cellulose-g-polyacrylamide copolymer samples showed that interpositioning of polyacrylamide chains markedly increased the specific viscosity and resistance to biodegradation of the graft copolymers. The flocculation characteristics of the graft copolymers were determined with kaolin suspension.

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Section: Resultsmentioning

confidence: 99%

Preparation, characterization, and properties of cellulose–polyacrylamide graft copolymers

Okieimen¹

2003

J of Applied Polymer Sci

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Graft copolymerization of methyl methacrylate upon gelatin initiated by benzoyl peroxide in aqueous medium

Keleş

Çeli̇k

Saçak

et al. 1999

J. Appl. Polym. Sci.

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The graft copolymerization of methyl methacrylate upon gelatin was studied using benzoyl peroxide as an organic initiator in aqueous medium. The grafting reactions were carried out within the 65–90°C temperature range, and the effect of monomer and initiator concentrations on the graft yield were also investigated. The maximum graft yield was obtained at a benzoyl peroxide concentration of 0.20 × 10−2 mol/L and the optimum temperature was 80°C. Thermogravimetric analysis showed that the thermal stability of gelatin increased as a result of grafting. Further, such changes in the properties of methyl methacrylate‐grafted gelatin as density, moisture regain, and water uptake were also determined. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 1547–1556, 1999

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Graft Copolymerizations of Modified Cellulose. Grafting Acrylamide onto Carboxymethyl Cellulose

Cited by 2 publications

References 0 publications

Preparation, characterization, and properties of cellulose–polyacrylamide graft copolymers

Preparation, characterization, and properties of cellulose–polyacrylamide graft copolymers

Graft copolymerization of methyl methacrylate upon gelatin initiated by benzoyl peroxide in aqueous medium

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