Reversed micelles formed by living polybutadiene anions (LPB) with different molecular weights in cyclohexane were investigated by static and dynamic light scattering. The most plausible aggregation number was 4, and the lower limit of the association constant was estimated from the light-scattering results. Apparent hydrodynamic radii and second virial coefficients of the reversed micelles of the three LPB were favorably compared with those expected for four-arm star polydutadiene in cyclohexane. The lower limit of the true propagation reaction rate constant for free LPB was also determined from literature reaction rate and association constant estimated.
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