Water → Butyl prop-2-enoate--methyl 2-methylprop-2-enoate (1/1)

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(wherein Me represents methyl and Ph represents phenyl), was dissolved in 3.0 g of methyl methacrylate as a monomer, and the solution was added into the reactor. After 20 minutes, as a polymerization initiator, 555 mg of 4,4′-azobis(4-cyanovaleric acid) together with 12 g of distilled water was added into the reactor. Stirring was performed at 80° C. for 20 minutes, and then 52.0 g of methyl methacrylate was dripped from the dropping funnel for over 90 minutes. After 30 minutes, 61.0 g of n-butyl acrylate as a monomer was dripped from the dropping funnel for over 1 hour. Stirring was performed at 80° C. for 6 hours, and the emulsion was salted out with calcium carbonate, followed by washing with distilled water. Thereby, 94.1 g of a methyl methacrylate-n-butyl acrylate diblock copolymer was produced. GPC confirmed that in the polymer, Mw=59,800, Mn=44,400, and Mw/Mn=1.35. 1H NMR analysis confirmed that the weight ratio of the poly(methyl methacrylate) portion to the poly(n-butyl acrylate) portion was 48:52, and that thiocarbonylthio groups were introduced at the poly(n-butyl acrylate) ends with an introduction rate of 84%.

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