Abstract
Potassium permanganate-induced graftcopolymerization of methyl methacrylate(MMA) on wool fibers was investigated under a variety of conditions. The graft yield was favourably influenced by increasing the reaction time and monomer and initiator concentration. Raising the reaction temperature from 50 to 70°C causes a significant increment in the graft yield. Using 4-mmolar potassium permanganate and 6-% methyl methacrylate at pH 1 (pH was adjusted by nitric acid), a graft yield of 70% could be obtained at 70°C in two hours reaction time. This yield could be increased up to 180% if wool is treated with thioglycolic acid prior to grafting. Dinitro-phenylated wool, on the other hand, showed a negligible graft yield, indicating that amino and hydroxyl groups in the wool molecules acts as sites for grafting. The consumption of permanganate was so rapid that about 60% of it was consumed in the first thirty minutes of the reaction during oxidation. On the other hand, relatively shorter time was required to cause full consumption during grafting. The excess of permanganate during grafting over that during oxidation was anticipated to initiation and termination of homopoly(methyl methacrylate). Wool with a graft yield of ca. 50% is nearly insoluble in alkali compared to the untreated one which is nearly completely soluble under similar conditions. A tentative mechanism for grafting on wool induced by permanganate was proposed.
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Kantouch, Aa., Abdel-Fattah, S. & Hebeish, A. Manganese(IV)-Initiated Graftcopolymerization of Methyl Methacrylate on Wool Fibers. Polym J 3, 675–680 (1972). https://doi.org/10.1295/polymj.3.675
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DOI: https://doi.org/10.1295/polymj.3.675