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Explore the unifying dynamics of viscoelastic liquids across complex coacervation phase diagrams in this 31-minute conference lecture from the Workshop on "Charged Soft Matter: Bridging Theory and Experiment" at the Erwin Schrödinger International Institute. Investigate the dynamics and structure of polyelectrolyte-rich liquids across the high-salt region using high molecular weight poly(sodium 4-styrenesulfonate) (PSS) and poly(diallyldimethylammonium chloride) (PDADMAC) systems. Discover how total polyelectrolyte concentrations were systematically increased at different added KBr concentrations to obtain liquid complex coacervates and single-phase, high-salt polyelectrolyte solutions. Learn about the self-similar dynamic response of entangled polymer liquids at each salt concentration and how time-polyelectrolyte superposition using concentration-dependent horizontal shift factors reveals universal behavior. Examine the construction of a master curve that unifies dynamics across all samples through salt-dependent horizontal shift factors. Analyze the strong dependence of complex coacervate dynamics on experimentally determined polyelectrolyte concentrations and compare this to salty solutions of non-interacting polyelectrolytes behaving as polymers in good solvent. Understand the extreme scaling behavior in complex coacervates that defies predictions for entangled associating polymers, likely due to very high polymer concentrations and large numbers of stickers per chain. Explore the concept of quasi-complex coacervates (quasi-CCs) that can mimic viscoelastic responses of complex coacervates up to polyelectrolyte solubility limits despite lacking effective stickers. Examine Small Angle X-ray Scattering (SAXS) results revealing distinct nanostructures in PSS/PDADMAC complex coacervates, their quasi-counterparts, and PSS solutions at equivalent polymer and salt concentrations. Discover how time-polyelectrolyte-salt superposition provides a predictive route for determining composition and properties of polyelectrolyte-rich materials across phase diagram regions.
