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Water-Based Polyurethane Dispersions: A Detailed Analysis of the Particle Charge Using Soft and Hard Particle Model.

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The hard particle model accurately describes the electrophoretic mobility of water-based polyurethane dispersions (PUDs), accounting for particle charge and electrostatic potentials. This model provides better insights into PUD behavior than soft particle theories.

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Area of Science:

  • Colloid and Surface Science
  • Polymer Chemistry
  • Electrochemistry

Background:

  • Water-based polyurethane dispersions (PUDs) exhibit complex electrophoretic mobility dependent on electrolyte concentration.
  • Understanding particle charge and electrostatic potentials is crucial for PUD characterization.

Purpose of the Study:

  • To investigate the electrophoretic mobility of PUDs using hard and soft particle models.
  • To determine particle charges and electrostatic potentials in PUDs with varying stabilizer and polyol content.

Main Methods:

  • Synthesis of PUDs via the acetone process.
  • Potentiometric acid-base titration for particle charge characterization.
  • Electrophoretic mobility measurements analyzed by soft and hard particle theories.

Main Results:

  • Acid-base titration revealed ionic groups located both on the surface and within polymer particles.
  • The soft particle model was unsuitable; the hard particle model accurately described electrophoretic mobility when including the relaxation effect.
  • Zeta potentials were well-modeled by the hard particle model with constant surface potential and shear plane distance.

Conclusions:

  • The hard particle model provides a superior description of PUD electrokinetic behavior compared to soft particle models.
  • Despite discrepancies in calculated surface charge density, the hard particle model offers valuable insights into PUD charge distribution and behavior.