Structure Formation in Phase-Separating Polymer Systems
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Phase separation process and its dynamics play an important                role in the preparation of many polymeric materials (such as                    high-impact plastics and synthetic membranes for separations).                  They affect the morphology, which, in turn, influences ultimate                 material properties.  Over the last three decades, increasing                   attention has been paid to this subject, the majority of research               concentrating on initial stages of phase separation using the                   linearized Cahn-Hilliard model.  Such an analysis cannot provide                the full answer; it ignores the later stages of phase                           separation, which in many cases is crucial for the determination                of the resulting structure.  Using the nonlinear Cahn-Hilliard                  theory and fluid dynamic methods, the investigator will study                   primarily the later processes, such as coarsening (Ostwald                      ripening) and hydrodynamic flow, with the earlier stages serving                to generate the initial conditions for the later ones.  The roles               of nucleation and thermal random force in the phase-separation                  process will also be studied.  The recent progress in handling                  the phase equilibria of ternary and higher systems, and the                     access to supercomputers to simulate the time-demanding                         multidimensional diffusion and hydrodynamic processes involved,                 will make it feasible to carry out this complex task.
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