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Hydrophobic Aggregation in Polyurethane Ionomer Solutions

Nomula1, Cooper

  • 1Department of Chemical Engineering, University of Delaware, Newark, Delaware, 19716

Journal of Colloid and Interface Science
|December 16, 1998
PubMed
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Model polyurethane ionomers exhibit unique solution behavior in polar solvents, forming compact spherical particles. This results in a new low-viscosity regime due to screened electrostatic interactions and hydrophobic aggregation.

Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Solution Behavior of Polymers

Background:

  • Polyurethane ionomers possess ionic groups along their backbone.
  • Understanding ionomer solution behavior is crucial for material applications.

Purpose of the Study:

  • To synthesize model polyurethane ionomers.
  • To investigate their solution behavior in a polar solvent (N-methylformamide).
  • To characterize the solution structures and properties.

Main Methods:

  • Synthesis of model polyurethane ionomers.
  • Viscometry measurements.
  • Static and dynamic light scattering.
  • Analysis in N-methylformamide.

Main Results:

Related Experiment Videos

  • Identified a new solution behavior regime with low reduced viscosity.
  • Observed formation of spherical particles (30 nm radius) with polymer core and ionic shell.
  • Detected hydrophobic interactions and aggregated ionomer chains.
  • Electrostatic interactions were effectively screened, showing no polyelectrolyte behavior.

Conclusions:

  • Polymer-solvent interactions significantly influence ionomer behavior in polar solvents.
  • Compact structures lead to very low solution viscosity.
  • The identified regime offers new insights into ionomer solution dynamics.