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Interpolymer complexation: comparisons of bulk and interfacial structures.

Beatrice Cattoz1,2, Wiebe M de Vos2,3, Terence Cosgrove2

  • 1†Department of Pharmaceutical, Chemical and Environmental Sciences, Faculty of Engineering and Science, University of Greenwich, Medway Campus, Central Avenue, Chatham Maritime, Kent ME4 4TB, U.K.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 21, 2015
PubMed
Summary
This summary is machine-generated.

Complexes form between sodium poly(styrenesulfonate) (NaPSS) and poly(vinylpyrrolidone) (PVP) in solution and at silica interfaces. Ionic strength influences NaPSS complexation, while excess NaPSS can cause depletion flocculation.

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Area of Science:

  • Polymer science
  • Surface chemistry
  • Materials science

Background:

  • Investigating polymer-polymer interactions is crucial for developing advanced materials.
  • Understanding polyelectrolyte behavior at interfaces informs nanoparticle assembly and stabilization.
  • Sodium poly(styrenesulfonate) (NaPSS) and poly(vinylpyrrolidone) (PVP) are widely used polymers with potential for synergistic interactions.

Purpose of the Study:

  • To elucidate the complex formation between NaPSS and PVP in bulk solution.
  • To characterize the behavior of NaPSS-PVP complexes at the silica/solution interface.
  • To determine the influence of pH and ionic strength on these interactions.

Main Methods:

  • Diffusion nuclear magnetic resonance spectroscopy (NMR) for solution dynamics.
  • Small-angle neutron scattering (SANS) for structural analysis in solution.
  • Solvent relaxation NMR and ellipsometry for interfacial studies.
  • Layer-by-layer assembly technique for planar silica interfaces.

Main Results:

  • Complex formation between NaPSS and PVP was observed in solution, independent of pH.
  • Increasing ionic strength enhanced NaPSS complexation without directly affecting PVP.
  • Complexes formed at the silica interface, with NaPSS-PVP interactions influenced by the order of addition.
  • Depletion flocculation occurred when NaPSS was in excess at the nanoparticle interface.
  • Surface complex formation was demonstrated at planar silica interfaces.

Conclusions:

  • NaPSS and PVP form distinct complexes in solution and at silica interfaces.
  • Ionic strength is a key factor modulating NaPSS-PVP complexation.
  • The findings provide insights into polymer adsorption, complex coacervation, and interfacial stabilization.