Abstract
By means of light scattering, the static critical behavior was investigated for symmetrical polymer blend solutions of polystyrene/poly(methyl methacrylate)/deuterated benzene and polystyrene/poly(2-chlorostyrene)/deuterated benzene with different polymeric indices N and polymer concentrations c. The temperature dependence of the isothermal susceptibility S T and the correlation length ξ t near the stability limit showed the static crossover from the mean-field to the three-dimensional Ising behavior in all solutions. The Ginzburg number Gi BK was evaluated with the aid of the crossover function of Belyakov and Kiselev. As c increases from the semidilute region to the bulk limit, the scaled Ginzburg number gi BK = Gi BK N decreased, with the power α of gi BK ∞ c α being -1.25 to -2 as expected by the theory based on the blob concept. The values of gi BK (bare) evaluated by the bare interactions were smaller than experimental values.
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