Static and dynamic light scattering from polystyrene/cyclohexane/toluene solutions

Static and dynamic light scattering data from polystyrene in cyclohexane an d toluene mixed solvent are reported. It is found from the Zimm plot analys is of the static data that if the subtraction of solvent signal is made pro perly then, the results are consistent with those in toluene indicating a p referential adsorption of the good solvent. Contin analysis of the dynamic data yields two modes unlike the dynamics of polystyrene in single solvent solutions which exhibit a single mode at all polymer concentrations covered here. A possible interpretation of the fast and slow modes is given.