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

Sinha, B. K.

doi:10.1081/ma-100101608

Cited by 6 publications

(1 citation statement)

References 28 publications

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“…The higher average molecular weight (M n ) of the methyl-substituted polysiloxane reduces the mobility of the epoxy groups, which leads to a higher activation energy. 27,28 The dependence on activation energy with viscosity could also account for the slight difference in activation energy in the cycloaliphatic-substituted polysiloxanes. Figure 6 illustrates that the glass transition temperature can be tailored by being able to add on the desired pendant group through hydrosilation.…”

Section: Photo and Differential Scanning Calorimetrymentioning

confidence: 98%

A new class of silicone resins for coatings

2007

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A new class of silicone has been developed for coatings or as coating additives. Cycloaliphatic silane monomers were prepared and reacted into more easily handled cyclic oligomers. These cyclic oligomers were ring-opened into siloxane polymers. The polymers were functionalized with a variety of groups, including: amino, glycidyl epoxide, cyclohexene epoxide, acrylic, and alkoxysilane. The cycloaliphatic silicones have been designed for a number of different curing conditions: (1) ambient temperature-cure (amino and glycidyl epoxide), (2) cationic ultraviolet (UV)-cure (cyclohexene epoxide), (3) radical UV-cure (acrylic), and (4) moisture-cure (alkoxysilane). The end usages thus far have been focused on silicone coatings; however, usage as coating additives will be a focus for future research. The cycloaliphatic silicone has been UV-cured with mixed sol-gel precursors for usage as aerospace coatings. The cycloaliphatic silicones have also been ambient temperature-cured for release coatings, and have application as anti-fouling coatings. The inherent low surface energy makes the cycloaliphatic silicones prime candidates for surface tension additives.

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Section: Photo and Differential Scanning Calorimetrymentioning

confidence: 98%

A new class of silicone resins for coatings

2007

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

Cited by 6 publications

References 28 publications

A new class of silicone resins for coatings

A new class of silicone resins for coatings

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

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

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