Isoprene → Isoprene acrylonitrile

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Then, thereto were added 53.0 parts of acrylonitrile, 68.2 parts of isoprene and 3.70 parts of methyl α-chlorophenyl acetate as an organic halide, and the mixture was stirred under heating at 80° C. After 142 hours, the glass reaction vessel was cooled in a dry ice-methanol bath, and the volatiles were distilled off under reduced pressure to give a random (isoprene/acrylonitrile) copolymer. After completion of the polymerization reaction, the conversion rate of isoprene was 89% and the conversion rate of acrylonitrile was 84%. The molecular weight in terms of polystyrene of the random (isoprene/acrylonitrile) copolymer obtained was Mw=2,990, Mn=1,920, and Mw/Mn=1.56. From the results of the 1H-NMR analysis of the random (isoprene/acrylonitrile) copolymer obtained, the polymer was confirmed to have 3% (the proportion of the number of polymer chains relative to the total polymer chains, the same shall apply hereinafter) of the structures represented by formulae (13a) and (13b), which are classified into general formula (1), 24% of the structure represented by formula (14), which is classified into general formula (2), and 64% of the structure represented by formula (15), which is classified into general formula (3), and a chlorine atom at one terminal of the polymer chain.

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