Abstract
Early stages of phase separation in liquid mixtures of polystyrene (PS) and poly(methylphenylsiloxane) were studied by light scattering. Measurements were made at four concentrations less than 60 wt% PS and at several temperatures in the two-phase region. The time (t) dependence of maximum intensity of scattered light Im and the corresponding wave number km did not obey the Cahn theory but could be represented by power-laws: Im∝tθ and km∝tφ with θ=0.69 (±0.17) and φ=−0.29 (±0.05). These values of θ and φ agree well with those predicted by recent theories of Langer et al. and Binder et al. for spinodal decomposition, and also with the experimental values for binary mixtures of small molecules. It was concluded that there is no essential difference in the mechanism of phase separation between mixtures of small molecules and polymer blends.
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