Determination of microscopic interaction parameters of ternary polymer solutions with light scattering data

Using a renormalized form of the Random Phase Approximation (or Tree Graph Approximation) we analysed data on the zero angle scattering intensity and the apparent radius of gyration for the system polystyrene-poly(methyl methacrylate)-bromobenzene. Since the microscopic parameters of this system are known from the analysis of the zero-angle scattering data, the theory yields a parameterfree prediction of the apparent radius of gyration which fits the data very well. To show the influence of renormalization we also analyse the data by an unrenormalized version of RPA.