Coexistence curve of polystyrene in methylcyclohexane. VIII. Crossover from Ising to renormalized Ising behavior in ternary system

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Abstract
In order to examine the crossover from the Ising behavior to the renormalized Ising behavior, we have measured the coexistence curves of the ternary system, polystyrene I+ polystyrene II+ methylcyclohexane, by varying the molecular weight ratio r of polystyrene II to polystyrene I and volume fraction ξ2 of polystyrene II in total polystyrene. The observed critical exponent β t for the concentration difference between two coexisting phases varies from 0.33 to 0.38 with the increase of parameter k=ξ2 r(r−1)2. This result is consistent with the theory of Broseta and Leibler [J. Chem. Phys. 90, 6652 (1989)]. The exponent for the diameter μ t was found in the range from 0.81 to 0.92. The average of μ t =0.86 is close to the exponent μ for binary systems.