(419c) Polymer Solutions at High Pressures: Perspectives on Phase Behavior, Density, and Viscosity

Polymer solutions in compressed fluids is of continuing interest and there has been a dramatic increase in both experimental and theoretical undertakings over the past two decades. A significant amount of effort has gone into assessment of the thermodynamic conditions and the kinetics associated with miscibility and phase separation of polymers in fluids and fluid mixtures containing a supercritical fluid component. Practical applications span a wide range from polymer synthesis to polymer modifications and processing, including but not limited to the generation of polymer particles, fibers, foams, and composites with micro or nano-structural features. Modifications and /or processing of biocompatible or biodegradable polymers are among recent activities.

Supercritical fluids have also been of special interest to John O'Connell, and I have had the pleasure of knowing John for more than 20 years.

In this presentation I will provide some reflections on what we have learned regarding polymer solutions at high pressures. Majority will rely on the experience gained in our own laboratory where we have taken a broad view and have tried to interconnect the results of basic measurements such as the density, viscosity, miscibility, phase separation, and polymorphic transformations to elucidate their combined significance in synthesis, modification, or processing of polymers for unique applications.