Investigation of the kinetics of graft copolymerization of acrylamide with cellulose in the presence of trivalent cobalt salts

Molotkov, V. A.; Kurlyankina, V.I.; Klenin, S.I.

doi:10.1016/0032-3950(72)90219-5

Cited by 7 publications

(3 citation statements)

References 8 publications

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“…This may due to the inherent properties of KGM and AM upon irradiation exposure: whereas AM predominantly undergoes crosslinking [ 20 ], KGM, like other natural polymers such as carrageenan and alginates [ 21 , 22 ], undergoes degradation [ 16 , 23 ]. Moreover, the G value for radical formation of AM on γ-irradiation was reported to be much higher than that of natural polymers [ 24 , 25 ]. Therefore, the higher G value and predominant crosslinking nature of AM on irradiation both favored faster grafting with increase in monomer concentration.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Konjac Glucomannan-Graft-Polyacrylamide via γ-Irradiation

You-hui

Jiang

et al. 2008

Molecules

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The synthesis of konjac glucomannan-graft-polyacrylamide (KGM-g-PAM) was carried out at 25°C by γ-irradiation under a N2 atmosphere. The effects of absorbed radiation dosage and monomer concentration on grafting yield and water absorbency were studied. The grafted copolymers were characterized using Fourier Transform Infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR), x-ray diffraction (XRD), thermogravimetric analysis (TGA) and gel permeation chromatography (GPC). The grafting yield was observed to increase with increasing absorbed dosage and monomer concentration. Compared with the original KGM, the grafted copolymers exhibited better thermal stability and water absorbency. The results suggest that γ-irradiation is convenient and efficient for inducing graft copolymerization of KGM and acrylamide (AM).

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Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Konjac Glucomannan-Graft-Polyacrylamide via γ-Irradiation

You-hui

Jiang

et al. 2008

Molecules

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“…The feature of the polymerization initiation by vanadium(V) salts is the necessity of the preliminary introduction of easily oxidized groups into the polymer-base due to a low redox potential [114]. Among the variable valence metal compounds, cobalt(ІІІ) salts are characterized by the highest redox potential, however, in the соpolymerization process they can also initiate the homopolymerization of, e.g., vinyl monomers [115] or lead to a destruction of the main chain of polysaccharides [115][116][117][118].…”

Section: Synthesis Methods For Branched Polymer Systemsmentioning

confidence: 99%

Features of the intramolecular structure of branched polymer systems in solution

2014

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The review is devoted to the synthesis and properties of branched polymer structures of a controlled molecular architecture. The work considers the main methods to obtain branched macromolecules. The results of both theoretical calculations and experimental studies of the structure and features of the behavior of the mentioned systems in solution are analyzed and generalized. The promising use of branched polymer systems as an alternative to linear systems is noted.

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“…Metal ions of variable valence such as Ce (IV), Fe(II), Mn(VII), Mn(III), V(V), Cr(VI) and Co(III) are investigated in the formation of free radicals. [14,15]. The ability to use Fenton-based systems in dark or light irradiation has been a topic of interest in the field of advanced oxidation technologies involving degradation of polulants.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Acrylic Acid-Grafted Cellulose in Aqueous Medium With Radical Initiators

Neira¹,

Tarraga²,

Catalan³

2008

J. Chil. Chem. Soc.

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The chemical modification of cellulose by grafting reaction with Acrylic Acid (AA) considering different reaction factors was investigated. Natural polymers such as Santa Fe Cellulose, Microcrystalline Cellulose (Avicell) and Secondary Pulp were studied as substrates. pH effect; Ce (IV), Mn(VII) and Fenton as initiators; time and temperature polymerization were investigated. Grafting reachs a maximum, 90 % graft, at pH 7. A medium to weak C=O band at 1715 cm -1 for carboxylic group in FTIR spectroscopy is presented. Santa Fe and Avicel cellulose grafted whith AA at 17 hours are degraded. Secondary pulp with Fenton at 50-60 and 70 ºC at 17 hours are degraded too. The degradation of polymers at long reaction times at 17 hours and 70ºC were analized by FTIR spectroscopy and electronic microscopy analysis (SEM).

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Investigation of the kinetics of graft copolymerization of acrylamide with cellulose in the presence of trivalent cobalt salts

Cited by 7 publications

References 8 publications

Synthesis and Characterization of Konjac Glucomannan-Graft-Polyacrylamide via γ-Irradiation

Synthesis and Characterization of Konjac Glucomannan-Graft-Polyacrylamide via γ-Irradiation

Features of the intramolecular structure of branched polymer systems in solution

Degradation of Acrylic Acid-Grafted Cellulose in Aqueous Medium With Radical Initiators

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