Cerium(IV)-sorbose-initiated polymerization of acrylamide and methacrylamide

Behari, Kunj; Agrawal, Uma Rani; Das, Rajarshi

doi:10.1016/0032-3861(93)90164-6

Cited by 14 publications

(6 citation statements)

References 12 publications

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“…As a result, R P (obs) and − R Ce were increased with an increasing SDS concentration, above its CMC. A similar type of observation was noted by Behari et al27 and Sinha et al30…”

Section: Resultssupporting

confidence: 82%

“…Due to the electrostatic attraction of Ce(IV) for the Stern layer of SDS micelles, a greater number of Ce(IV) species were available at the micellar surface on increasing the concentration in the reaction mixture, which ameliorated the free‐radical formation, resulting higher values of R P (obs) . The square‐root dependence of R P (obs) on the Ce(IV) concentration was also reported by other workers earlier 27, 28. The rate of Ce(IV) consumption, − R Ce , has a linear dependence on the Ce(IV) concentration.…”

Section: Resultssupporting

confidence: 82%

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Acrylonitrile polymerization initiated by Ce(IV)–cyclohexanone redox system in presence of surfactant

Behera

2003

J of Applied Polymer Sci

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ABSTRACT:The rate of polymerization of acrylonitrile, using the Ce(IV)-cyclohexanone redox system as an initiator, was studied kinetically, in the presence of 0.015M sodium dodecyl sulfate (SDS), over a temperature range of 25-45°C. The rate of polymerization (R P ), percentage of monomer conversion, and rate of Ce(IV) consumption (ϪR Ce ) were found to increase with the concentration of SDS, above its CMC. The effect of [AN], [Ce(IV)], [H ϩ ], and the ionic strength were also studied. The overall activation energies for the polymerization processes were computed to be 23.14 and 17.64 kcal/mol in the absence and presence of 0.015M SDS. A suitable kinetic mechanistic scheme for the free-radical mechanism was proposed.

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“…As a result, R P (obs) and − R Ce were increased with an increasing SDS concentration, above its CMC. A similar type of observation was noted by Behari et al27 and Sinha et al30…”

Section: Resultssupporting

confidence: 82%

Section: Resultssupporting

confidence: 82%

Acrylonitrile polymerization initiated by Ce(IV)–cyclohexanone redox system in presence of surfactant

Behera

2003

J of Applied Polymer Sci

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“…Two hours after initiation, an additional 2 g of GMA was added to the vessel, and the reaction was continued for 24 h. GMA units on the particle surface were partially hydrolyzed to form glycol groups during polymerization . After purification of the core particles, NIPAM was graft-polymerized from core particle surfaces in water at 25 °C by using the redox reaction between Ce and the glycol groups . To initiate graft polymerization, 0.5 g of core particles and 0.075 g of Ce were added to 75 g of acetic buffer (pH 3.3, 15 mM).…”

Section: Methodsmentioning

confidence: 99%

Thermosensitive Pickering Emulsion Stabilized by Poly(N-isopropylacrylamide)-Carrying Particles

2008

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Poly(N-isopropylacrylamide) (PNIPAM)-carrying particles were characterized as thermosensitive Pickering emulsifiers. Emulsions were prepared from various oils, such as heptane, hexadecane, trichloroethylene, and toluene, with PNIPAM-carrying particles. PNIPAM-carrying particles preferentially formed oil-in-water (O/W)-type emulsions with a variety of oils. All the emulsions stabilized by PNIPAM-carrying particles were stable for more than 3 months as long as they were stored at room temperature. However, when the emulsions were heated from room temperature to 40 degrees C, at which point the PNIPAM layer caused a coil-to-globule transition, phase separation occurred. Thus, by using thermosensitive PNIPAM-carrying particles as emulsifiers, the stability of the Pickering emulsions could be controlled by a slight change in temperature.

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“…2, Table III), which clearly indicate that termination occurs through bimolecular interaction of growing polymer chain radicals 33, 34. The M v decreases with increase of Ce(IV) concentration, which can be explained by the fact that increasing concentration of Ce(IV) provides more chance for premature termination of growing chain radicals, which inturn reduces the degree of polymerization 33, 34…”

Section: Resultsmentioning

confidence: 99%

Polymerization of acrylonitrile initiated by Ce(IV)‐sucrose redox system: A kinetic study

Mahadevaiah¹,

Demappa²,

Sangappa³

et al. 2008

J of Applied Polymer Sci

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The polymerization of acrylonitrile (M), initiated by the free radicals formed in situ in the Ce (IV)-sucrose redox system, was studied in aqueous sulfuric acid medium under nitrogen atmosphere in the temperature range of 30-608C. . The rate of Ceric ion disappearance and the rate of polymerization R p have been measured. The effects of some water-miscible organic solvents, surfactants, ionic strength, and complexing agents on the rate of polymerization were investigated. The temperature-dependence of the rate was studied and the activation parameters were computed using the Arrhenius and Eyring plots. A mechanism consistent with the experimental data, involving Ce(IV)-sucrose complex formation, which generates free radicals, is suggested. The chain termination step of the polymerization reaction was determined.

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Cerium(IV)-sorbose-initiated polymerization of acrylamide and methacrylamide

Cited by 14 publications

References 12 publications

Acrylonitrile polymerization initiated by Ce(IV)–cyclohexanone redox system in presence of surfactant

Acrylonitrile polymerization initiated by Ce(IV)–cyclohexanone redox system in presence of surfactant

Thermosensitive Pickering Emulsion Stabilized by Poly(N-isopropylacrylamide)-Carrying Particles

Polymerization of acrylonitrile initiated by Ce(IV)‐sucrose redox system: A kinetic study

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