New oxidation-reduction systems in the synthesis of graft copolymers of cellulose

Morin, B. P.; Rogovin, Z. A.

doi:10.1016/0032-3950(76)90167-2

Cited by 8 publications

(3 citation statements)

References 22 publications

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“…The decrease in grafting ratio beyond 6.7 × 10 −3 mol dm −3 might be attributed to a detrimental factor arising from excess of Fe (III) ions production by oxidation of Fe (II) eq. (2) and also the premature termination of growing grafted chains was observed by Morin and Rogovin25 and Misra et al26 in graft copolymerization initiated with H 2 O 2 /Fe 2+ system beyond certain concentration of Fe 2+ . …”

Section: Resultsmentioning

confidence: 74%

Graft copolymerization of methacrylic acid onto xanthan gum by Fe²⁺/H₂O₂ redox initiator

Kumar

Srivastava

Behari

2007

J of Applied Polymer Sci

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The graft copolymer of xanthan gum with methacrylic acid was synthesized in inert atmosphere by using Fentos reagent as a redox initiator. The effect of reaction conditions on grafting parameters [G(%), E(%), C(%), A(%), H(%), and R g ] was investigated. Similar trend was observed on increasing the concentration of ferrous ion and hydrogen peroxide from 4.0 to 20.0 Â 10 À3 mol dm À3 and 2.5 to 10 Â 10 À3 mol dm À3 respectively, i.e., initially grafting parameters increased and after a certain range of concentration grafting parameters showed decreasing trend. Hydrogen ion shows influenced result i.e., small increment of concentration in hydrogen ion presents much increment in percent of grafting. It was observed that the [G(%), E(%), C(%), A(%), and R g ] increased upto 6.67 Â 10 À2 mol dm À3concentration of methacylic acid after that it decreased. Maximum G(%) was obtained at minimum concentration of xanthan gum i.e., at 40 Â 10 À2 g dm À3.The optimum temperature and time duration of reaction for maximum percentage of grafting were found to be 458C and 150 min respectively. Thermogravimetric analysis showed that the xanthan gum-g-methacrylic acid is thermally more stable than pure gum.

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Section: Resultsmentioning

confidence: 74%

Graft copolymerization of methacrylic acid onto xanthan gum by Fe²⁺/H₂O₂ redox initiator

Kumar

Srivastava

Behari

2007

J of Applied Polymer Sci

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“…The premature termination of growing grafted chains has been observed by Rogovin et a/. 22 and Mishra et a/. 23 in graft copolymerization initiated with an H 2 0 2 /Fe(II) system beyond certain concentrations of Fe(II).…”

Section: Effects Of Catalyst Concentrationmentioning

confidence: 87%

Graft Copolymerization with a New Class of Acidic Peroxo Salt IV. Grafting of Acrylamide onto Jute Fiber Using Potassium Monopersulphate: Catalyzed by Fe(II)

Samal

Samantaray

Samal

1986

Polym J

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ABSTRACT:Graft copolymerization of acrylamide (AM) onto jute fibers has been studied in aqueous solution using a new class of acidic peroxosalt "potassium monopersulphate" as the initiator, under the catalytic influence of Fe(II) in a nitrogen atmosphere. It was observed that the graft yield was influenced by the reaction time, temperature, and concentration of the monomer, initiator, and base polymer. The grafting reaction has also been studied in the presence of a number of salts and organic solvents. The maximum graft yield (75.3%) was observed at 25°C at the concentrations of monomer (1.2 M), initiator (12.9 x 10-3 M), and catalyst (1.0 x 10-3 M) for a reaction time of 4 hours. From the experimental results a suitable mechanism for graft initiation and termination has been suggested.

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“…Many highly efficient initiating RDS containing metals of variable valence have been proposed [20][21][22][23]. A correlation was found between the structure of complexes of metals of variable valence and their activity in initiation of graft polymerizaion.…”

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confidence: 99%

Chemisorption fibres based on graft copolymers: Fabrication and properties. A review

Druzhinina¹,

Nazar'ina²

1999

Fibre Chem

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Scientific concepts concerning the characteristics of graft polymerization to oriented polymeric materials and p~lymer-anal~g transf~rmati~ns ~f the graft p~lymer were elab~rated based ~n systematic studies. The principles of fabrication of sorption-active fibre materials Of different ~,pes based on graft copolymers and the most important directions of their use were formulated.The consequences of human technological activity has sharply worsened the environmental situation, making environmental protection an urgent modern problem. One direction in the complex solution of these problems is to develop highly efficient processes for scrubbing of industrial gas-air emissions and cleaning ofwastewaters. Sorption materials, used to prevent further environmental pollution and ensure rational resource management, are playing an important role in the creation of such processes.These materials include chemisorption fibres with a developed specific surface area which is more than one order of magnitude greater than the surface area of granulated sorbents. A comparison of the geometric surface area of fbres and granules gives an idea of the advantage of fibre sorbents over granulated sorbents, manifested by a higher rate of chemisorpticn and greater completeness of removal. In addition, the variety of forms of use of fibre sorbents favors the rational organization of technological processes.The analysis of the scientific and technical literature on fabrication of chemisorption fibres revealed the following methods:-spinning of fbres from blends of fibre-forming polymers with nonfibre-forming polymers containing ionogenic groups;-synthesis of fibre-forming copolymers containing functionally active groups and fabrication of fibres from them; -incorporation of functionally active groups in the fibre via reactions in the polymer chains; -modification of fibres by graft polymerization of ionogenic and nonionogenic monomers with subsequent polymeranalog transformations of the graft chains.Spinning of chemisorption fibres from polymer blends is a relatively simple method. However, the difficulties of obtaining stable spinning solutions from blends of fibre-forming and nonfibre-forming polymers and the possibility of washing out the sorption-active component of the fibre make it necessary to conduct an additional operation of formation of a threedimensional spatial network in the fibre [1,2]. Moreover, this method can be used together with other variants for production of sorption-active materials.The method of spinning fibre chemisorbents from copolymers with chemically active groups in the main chain has been widely used in fabrication of chemisorption fibres of the VION group [3,4]. In this case, acrylonitrile is usually usedas the fibre-forming component, and the composition of the ionogenic comonomers responsible for incorporation of sorptionactive groups in the structure of the fibre is relatively varied. This concerns methylvinylpyridine (MVP), vinylimidazole, sodium p-styrenesulfonate, and others [3,[5][6][7][8]. The fibres...

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New oxidation-reduction systems in the synthesis of graft copolymers of cellulose

Cited by 8 publications

References 22 publications

Graft copolymerization of methacrylic acid onto xanthan gum by Fe²⁺/H₂O₂ redox initiator

Graft copolymerization of methacrylic acid onto xanthan gum by Fe²⁺/H₂O₂ redox initiator

Graft Copolymerization with a New Class of Acidic Peroxo Salt IV. Grafting of Acrylamide onto Jute Fiber Using Potassium Monopersulphate: Catalyzed by Fe(II)

Chemisorption fibres based on graft copolymers: Fabrication and properties. A review

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New oxidation-reduction systems in the synthesis of graft copolymers of cellulose

Cited by 8 publications

References 22 publications

Graft copolymerization of methacrylic acid onto xanthan gum by Fe2+/H2O2 redox initiator

Graft copolymerization of methacrylic acid onto xanthan gum by Fe2+/H2O2 redox initiator

Graft Copolymerization with a New Class of Acidic Peroxo Salt IV. Grafting of Acrylamide onto Jute Fiber Using Potassium Monopersulphate: Catalyzed by Fe(II)

Chemisorption fibres based on graft copolymers: Fabrication and properties. A review

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Graft copolymerization of methacrylic acid onto xanthan gum by Fe²⁺/H₂O₂ redox initiator

Graft copolymerization of methacrylic acid onto xanthan gum by Fe²⁺/H₂O₂ redox initiator