CONCURRENT STATIC AND DYNAMIC LIGHT-SCATTERING FROM MACROMOLECULAR SOLUTIONS .1. MODEL SYSTEMS IN THE LOW Q-REGIME

Concurrent acquisition of static and dynamic light scattering data has been performed on model systems of dilute narrow molecular weight distribution polystyrenes in toluene and also on dilute suspensions of monodisperse polystyrene lattices in water. The data were analysed to extract a self consistent set of thermodynamic (molecular weight, radius of gyration, virial coefficient) and hydrodynamic (diffusion coefficient) results. It is demonstrated that the intensity autocorrelation function can be analysed to determine the absolute magnitude of the temporal-spatial scattering surface and can therefore provide the results which would normally be obtained from a separate static light scattering experiment. Preliminary results in the intermediate q regime suggest that with a concurrent analysis scheme of the type demonstrated here it will be possible to analyse in further detail the transition of the scattering function from q2 to q3 dependence.