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Polyelectrolyte complex coacervation by electrostatic dipolar interactions.

Sabin Adhikari1, Michael A Leaf2, Murugappan Muthukumar2

  • 1Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA.

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Summary
This summary is machine-generated.

Complex coacervation, driven by combined hydrophobicity and electrostatics, leads to liquid-liquid phase separation in polyelectrolyte solutions. This phenomenon is influenced by salt concentration, temperature, and polymer properties.

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Area of Science:

  • Physical Chemistry
  • Polymer Science
  • Materials Science

Background:

  • Complex coacervation involves liquid-liquid phase separation in oppositely charged polyelectrolyte solutions.
  • It is driven by the spontaneous formation of polycation-polyanion complexes, forming a coacervate phase and a dilute phase.

Purpose of the Study:

  • To model complex coacervation using a mean-field theory.
  • To compute coacervate phase diagrams considering polymer composition, salt concentration, and temperature.
  • To investigate the interplay of hydrophobicity and electrostatics in driving phase separation.

Main Methods:

  • Utilized a mean-field theory accounting for ion entropy, electrostatic interactions, and polymer-solvent hydrophobicity.
  • Treated polyelectrolyte complexes as flexible chains with dipolar and uniformly charged segments.
  • Computed phase diagrams based on varying system parameters.

Main Results:

  • Demonstrated that combined hydrophobicity and electrostatics, not either alone, drive phase separation for moderately hydrophobic polyelectrolytes.
  • Observed that increased salt concentration, temperature, and composition asymmetry suppress coacervation.
  • Noted that increased chain length promotes coacervation and preferential salt partitioning into the dilute phase.

Conclusions:

  • The study provides a theoretical framework explaining key experimental observations in complex coacervation.
  • Predicts the emergence of instability loops with two critical points, offering new insights into phase behavior.
  • Highlights the crucial role of enhanced effective hydrophobicity due to dipolar attractions in driving phase separation.