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Colloid and Polymer Science

, Volume 293, Issue 4, pp 1191–1204 | Cite as

Synthesis and characterization of cationic colloidal unimolecular polymer (CUP) particles

  • Ameya M. Natu
  • Marcus Wiggins
  • Michael R. Van De Mark
Original Contribution

Abstract

Cationic colloidal unimolecular polymer (CUP) particles were prepared by using a lower concentration of the quaternary ammonium functional copolymers during the process of water reduction. True nanoscale (diameter 3–9 nm), zero-volatile organic content (VOC), spheroidal CUP particles, and self-stabilized via electro-repulsion of surface cationic groups were obtained. The viscosity of the cationic CUP systems was influenced by the electroviscous effects arising from the surface charge and the associated surface water layer. The density of surface water was 1.6 % greater than the bulk water density which was attributed to the structuring of water around charged quaternary ammonium groups. The equilibrium surface tension values decreased linearly with increasing concentration and surface charge density of CUP particles due to a greater reduction in surface energy. The rate of surface tension reduction determined by maximum bubble pressure method decreased with increasing concentration and the molecular weight of the CUP due to diffusion effects.

Keywords

Cationic unimolecular polymer Water reduction Associated water fraction Surface water density Dynamic surface tension Kinetically limited adsorption 

Notes

Acknowledgments

The authors would like to acknowledge the Coatings Institute and the Department of Chemistry of Missouri S&T for the financial support and resources. We thank our fellow researchers: Sagar Gade and Yousef Dawib for their assistance.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Ameya M. Natu
    • 1
  • Marcus Wiggins
    • 1
  • Michael R. Van De Mark
    • 1
  1. 1.Department of Chemistry, Missouri S & T Coatings InstituteMissouri University of Science and TechnologyRollaUSA

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