1986 年 55 巻 8 号 p. 2687-2694
Structure function S(k, t) in process of phase separation was investigated by light scattering for polystyrene/poly(methylphenylsiloxane) mixtures to test the scaling law for S(k, t) in the late stage. For the critical composition, the structure function obeyed the scaling law of S(k, t)=km−3·S(k⁄km), where k is the wave number, km the wave number yielding the maximum intensity, and S(k⁄km) the scaled structure function independent of time t. However, S(k, t) for the off-critical composition gradually changed with t, becoming to have a broader peak, so that the scaling law was only approximately satisfied. The full-width at a half of the maximum intensity increased with increasing quench-depth, being almost the same for the critical and off-critical compositions at comparable quench-depths. The value of exponent h in the power law S(k⁄km)∝(k⁄km)−h at k⁄km>1 was around 4 for the off-critical quench, in agreement with the Furukawa theory, while for the critical quench it was slightly larger than 4, but not as large as the theoretical value 6.
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