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Under the synthesis conditions used here, butadiene reacts first along with a few styrene units incorporated in a statistical fashion.

On thebasis of previous S/B copolymerization studies performed under similar conditions, it can indeed be assumed that all S monomers incorporated in the first stages of the copolymerization step are statistical. In pure cyclohexane and for similar monomer feed compositions, nonstatistical styrene units only start to appear at 50% conversion.
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