Effect of sodium lauryl sulfate on the polymerization of acrylonitrile

Patel, Nishant; Mohammed, Intisar Yahiya; Das, B.; Sinha, B. K.

doi:10.1002/app.1982.070271020

Cited by 8 publications

(2 citation statements)

References 5 publications

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“…At a higher concentration of cyclohexanone, its solubilization in the micellar part will be more, leading to a greater number of free radicals [14][15][16][17][18][19][20][21] which enhances the rate. This can be explained on the basis of solubilization.…”

Section: Dependence Of the Rate On The [Ch]mentioning

confidence: 99%

Polymerization of Acrylamideinitiated by V(v)-Cyclohexanone Redox System in Micellar Phase: A Kinetic Study

Sinha

1999

Journal of Macromolecular Science, Part A

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The kinetics of acrylamide (AM) polymerization initiated by V(V)-cyclohexanone(CH) redox system in the presence of anionic surfactant, sodium dodecyl sulphate (SDS), in aqueous sulphuric acid have been studied over a temperature range of 30-50¡C. The rate of Polymerization, R P(obs) , as well as the rate of V(V) consumption, -R V , were found to increase in the presence of SDS, above its CMC, while decrease with cationic surfactant, cetyl trimethylammonium bromide (CTAB). The non-ionic surfactant, TX-100, has no effects on the rates. Both the rates were also determined at varying concentration of AM, V(V), CH, H + and at various ionic strength in the presence of 0.015M SDS in Downloaded by [Akdeniz Universitesi] at 16:25 22 December 2014the solution. The overall activation energy for the proccesses calculated from the Arrhenious plot, were found to be 19.34 and 26.58 kcal/mol in the presence and absence of 0.015M SDS. The viscosity average molecular weight of the polymer obtained in presence of SDS increases with the concentration of SDS. A suitable free radical mechanistic scheme for the polymerization process is proposed. 1460 PATRA AND SINHA Downloaded by [Akdeniz Universitesi] at 16:25

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Section: Dependence Of the Rate On The [Ch]mentioning

confidence: 99%

Polymerization of Acrylamideinitiated by V(v)-Cyclohexanone Redox System in Micellar Phase: A Kinetic Study

Sinha

1999

Journal of Macromolecular Science, Part A

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“…Investigation of the influence of surfactants on the radical polymerization of various monomers in aqueous medium have shown that the polymerization rates depend very much on the nature and concentration of the surfactant employed. [12][13][14][15][16] We have carried out a detailed study of the solvent/medium effect on the reactivity of HEMA and a few other monomers and their radicals in radical c o p~l y m e r i z a t i o n .~ Hence, it was felt worthwhile t o investigate the effect of surfactants on the kinetics and mechanism of homopolymerization of HEMA.…”

Section: Introductionmentioning

confidence: 99%

Redox polymerization of 2‐hydroxyethyl methacrylate (HEMA). I. Influence of surfactants on polymerization kinetics

Mathew

Mahadevan

1995

J. Polym. Sci. A Polym. Chem.

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Oxidation of ferrous orthophenanthroline (FeP) by peroxydiphosphate (PP) in aqueous medium at pH 1 was followed spectrophotometrically. Kinetic analysis has shown that oxidation occurs via the formation of an intermediate complex between FeP and PP. Equi‐librium and rate constants were calculated. Influence of surfactants on the oxidation of FeP by PP was also Investigated. The equilibrium constant for complex formation was found to be higher in the presence of surfactants. The enhanced complex formation has been attributed to the ionic interactions between the charged surfactant and the ionic species in the reaction medium. Polymerization of HEMA initiated by the redox system,FeP/PP, was carried out in aqueous medium, under the conditions of excess reductant over oxidant and excess oxidant over reductant. The polymerization followed different mech‐anisms under these conditions; with excess oxidant, the growing polymer radicals underwent oxidative termination, while with excess reductant, primary radical termination was pre‐ferred. The effect of surfactants on the aqueous polymerization of HEMA using the redox system FeP/PP was also investigated. In addition to the decrease in rate, the polymerization followed a different mechanism in the presence of surfactants, the growing radicals ter‐minated by mutual interaction. © 1995 John Wiley & Sons, Inc.

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Effects of surfactants on acrylonitrile polymerization initiated by a Cr(VI)–cyclohexanone redox system: A kinetic study

Behera

Sinha

2003

J of Applied Polymer Sci

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ABSTRACT:The polymerization of acrylonitrile (AN) was kinetically studied with a Cr(VI)-cyclohexanone (CH) redox system as an initiator from 25 to 45°C in the presence of a surfactant. The rate of polymerization and the percentage of the monomer conversion increased as the concentration of the anionic surfactant [sodium dodecyl sulfate (SDS)] increased above its critical micelle concentration. However, the cationic surfactant (cetyltrimethylammonium bromide) reduced the rate considerably at higher concentrations, whereas the nonionic surfactant (TX-100) had no effect on the rate. The effects of the Cr(VI), CH, AN, and H ϩ concentrations and the ionic strength on the rates were also examined. The presence of 0.015M SDS reduced the overall activation energy of the polymerization by 5.55 kcal/mol with respect to that in the absence of the surfactant. With increasing SDS concentration, the viscosity-average molecular weight also increased. A suitable mechanistic scheme was proposed for the polymerization process.

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Effect of sodium lauryl sulfate on the polymerization of acrylonitrile

Cited by 8 publications

References 5 publications

Polymerization of Acrylamideinitiated by V(v)-Cyclohexanone Redox System in Micellar Phase: A Kinetic Study

Polymerization of Acrylamideinitiated by V(v)-Cyclohexanone Redox System in Micellar Phase: A Kinetic Study

Redox polymerization of 2‐hydroxyethyl methacrylate (HEMA). I. Influence of surfactants on polymerization kinetics

Effects of surfactants on acrylonitrile polymerization initiated by a Cr(VI)–cyclohexanone redox system: A kinetic study

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