Abstract
The early stages of nucleation and growth in a mixture of high polymers were studied by time-resolved neutron scattering. During the first 160 min, a slow clustering was evident, indicating a buildup of concentration fluctuations. The clusters formed at the end of this stage had the characteristics of ``critical nuclei,'' because phase separation proceeded rapidly after their formation. At this stage, the scattering profiles showed a peak at finite wave vectors $({q}_{\mathrm{max}})$. The scaling exponents for the time dependence of the peak intensity and ${q}_{\mathrm{max}}$ are inconsistent with current theories.
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