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Static and Dynamic Light Scattering from Polystyrene/Poly(methyl methacrylate)/Bromobenzene: Temperature Effects

Static and dynamic light scattering measurements on polystyrene/poly(methyl methacrylate)/ bromobenzene solutions under the optical θ condition are reported. The θ condition is fulfilled by knowing that the average increment of refractive index of the two polymers is zero and letting their composition be 1/2. The total polymer concentration is kept constant and the temperature is changed from 30°C to the critical temperature T c which is found at 2°C. The results reveal two distinct ranges of temperatures where both static and dynamic properties show different behaviors. The upper range of temperatures which is above 7°C in this mixture can be described quite well with the mean field model based on the random phase approximation