Magnetic and electrostatic effects on the polymerization of water-soluble monomers

Ignacio Rintoul
2006
EPFL thesis

Free radical polymerization is the most frequently used technique to produce synthetic polymers. They represent more than 25% of the total volume of materials made by the mankind. 3% thereof correspond to water soluble polymers with annual growth rates estimated as 8%. Therefore, everything contributing to progress of the radical polymerization of water soluble monomers may be evaluated as signicant. This thesis was devoted to identify the influence of magnetic (MF) and electrostatic interactions on the kinetics and mechanism of the radical polymerization of water soluble monomers. Acrylamide (AM), acrylic acid (AA), its ionized species, acrylate (A-), and diallyldimethylammonium chloride (DADMAC) were selected for homo and copolymerization case studies. Thermal and photochemically initiated polymerizations were performed varying the MF intensity, pH, ionic strength, monomer and initiator concentration, conversion degree, viscosity and temperature of the polymerization medium. The thesis reports the experiments, results, and conclusions thereof, increasing gradually the complexity of the polymerization system. It was demonstrated that an hybrid mechanism rules the persulfate initiated polymerization of AM also at 0.05

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Ignacio Rintoul
2006
EPFL thesis

Abstract

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https://infoscience.epfl.ch/record/62769?ln=en

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Related concepts (4)

Reaction mechanism

In chemistry, a reaction mechanism is the step by step sequence of elementary reactions by which overall chemical reaction occurs. A chemical mechanism is a theoretical conjecture that tries to describe in detail what takes place at each stage of an overall chemical reaction. The detailed steps of a reaction are not observable in most cases. The conjectured mechanism is chosen because it is thermodynamically feasible and has experimental support in isolated intermediates (see next section) or other quantitative and qualitative characteristics of the reaction.

Radical polymerization

In polymer chemistry, free-radical polymerization (FRP) is a method of polymerization by which a polymer forms by the successive addition of free-radical building blocks (repeat units). Free radicals can be formed by a number of different mechanisms, usually involving separate initiator molecules. Following its generation, the initiating free radical adds (nonradical) monomer units, thereby growing the polymer chain. Free-radical polymerization is a key synthesis route for obtaining a wide variety of different polymers and materials composites.

Heat transfer

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