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Solvating Effects02:12

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An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
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The free energy change associated with dissolving a solute in a liter of solvent is called the free energy of a solution, ΔGsolution. The overall ΔGsolution is expressed as the balance of ΔGinteraction against the always-favorable free-energy of mixing, ΔGmixing. Solution formation is favorable if  ΔGsolution is less than zero, whereas it is unfavorable if ΔGsolution is greater than zero. In short, for a solution to form and complete dissolution to take place,...
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Cosolvent Control of Lower and Upper Critical Solution Behavior in Polyelectrolyte Complexes.

Yuanchi Ma1, Vivek M Prabhu2

  • 1College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266042, China.

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Polar cosolvent-water mixtures control polyelectrolyte complex liquid-liquid phase separation (LLPS). Addition of cosolvents induces new phase behaviors, including upper-critical solution temperature (UCST) phenomena, altering phase diagrams.

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Area of Science:

  • Polymer Science
  • Physical Chemistry
  • Materials Science

Background:

  • Polyelectrolyte complex solutions exhibit associative liquid-liquid phase separation (LLPS) driven by electrostatic correlations.
  • In water, this LLPS shows upper-critical salt concentration and lower-critical solution temperature (LCST) behavior.
  • Controlling LLPS is crucial for applications in materials and biomaterials.

Purpose of the Study:

  • To investigate the effect of polar cosolvents on the LLPS of polyelectrolyte complex solutions.
  • To explore the emergence of new phase boundaries and critical phenomena.
  • To understand the role of solvent properties and electrostatic interactions in cosolvated systems.

Main Methods:

  • Preparation of polyelectrolyte complex solutions using degree of polymerization-matched quaternary poly(N,N-dimethylaminoethyl methacrylate chloride) (qPDMAEMA) and sodium poly(acrylate) (PA).
  • Addition of miscible polar cosolvents (e.g., ethylene glycol, N-methyl formamide) to aqueous solutions.
  • Observation and analysis of liquid-liquid phase separation behavior across varying temperatures and salt concentrations.

Main Results:

  • Addition of polar cosolvents significantly alters the phase behavior of polyelectrolyte complexes.
  • A shift in the lower-critical solution temperature (LCST) and the appearance of an upper-critical solution temperature (UCST) were observed.
  • The new UCST corresponds to a segregative LLPS, where the polycation separates from the polyanion-rich phase.
  • This behavior was observed with cosolvents that alter the dielectric constant, suggesting non-electrostatic drivers for phase separation.

Conclusions:

  • Polar cosolvents provide a versatile method for tuning the phase behavior of polyelectrolyte complexes.
  • The emergence of UCST indicates a transition from associative to segregative LLPS under cosolvation.
  • Electrostatic correlations may not be the sole determinant of phase behavior in cosolvated polyelectrolyte systems.
  • A conceptual 3D phase diagram reveals complex phase surfaces with distinct critical lines in cosolvated systems.