A Test of the Scaling Law for Structure Function in Phase Separation Process of Polystyrene/Poly (methylphenylsiloxane) Liquid Mixtures

概要

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Structure function S(k, t) in process of phase separation was investigated by lightscattering for polystyrene/ poly(methylphenylsiloxane) mixtures to test the scaling lawfor S(k, t) in the late stage. For the critical composition, the structure functionobeyed the scaling law of S(k, t)=k;"S(k/k.), where k is the wave number, k. thewave number yielding the maximum intensity, and S(k/ k-) the scaled structure func-Lion independent of time t. However, S(k, t) for the off-critical composition graduallychanged with t, becoming to have a broader peak, so that the scaling law was only ap-proximately satisfied. The full-width at a half of the maximum intensity increasedwith increasing quench-depth, being almost the same for the critical and off-criticalcompositions at comparable quench-depths. The value of exponent h in the powerlaw S(k/k-)cx-(k/k.) " at k/k..>1 was around 4 for the off-critical quench, in agree-ment with the Furukawa theory, while for the critical quench it was slightly largerthan 4, but not as large as the theoretical value 6.
社団法人日本物理学会の論文
1986-08-15