Abstract
Abstract The effect of various phenols on the polymerization of methyl acrylate (MA) initiated by the acidic permanganate/thioglycerol redox couple has been studied in aqueous solution at 30°C. It was found that among the various phenols used, o-cresol, m-cresol, resorcinol, and quinol behave as very weak inhibitors but retard the reaction to a significant extent. Other phenols such as phenol, o-nitrophenol, p-nitrophenol, α-naththol, β-naphthol, catechol, and pyrogallol behave both as inhibitors, and retarders. The rate of this process is dependent upon the substituents in the phenol and often their position. However, it is noticed that all phenols, irrespective of their low or high values of transfer constants, retard the rate of polymerization. The polymerization reaction has also been studied at 25–40°C in the absence of phenols by varying the concentrations of other components. The rate of polymerization increases with increases in the concentration of the monomer and reducing agent, and with the cat...
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