Details of phase separation processes in polymer blends

We have investigated the details of phase separation dynamics in high-molecular-weight (polystyrene-PVME) polymer blends utilizing small angle light scattering techniques and have compared our results with the various theories, computer simulations, and phase separation dynamics in small molecule systems. Although linearized theories are consistent with many qualitative features of phase separation dynamics, they fail to provide quantitative accuracy. It appears that both nonlinear terms and hydrodynamic effects must be included to provide a quantitative description. Quantitative agreement between phase separation dynamics in small molecule systems and high-molecular-weight polymer blends is also reported.