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Worm-like micelles in water solutions of 1, 4 poly (1, 3-butadiene)-polyethylene oxide diblock copolymer

  • Brisa Arenas-Gómez
  • Marko Vinceković
  • Cristina Garza
  • Rolando Castillo
Regular Article

Abstract

The main purpose of this study is to determine for the first time the structure of the self-assembled aggregates in the system made of 1,4 poly(1,3-butadiene)-polyethylene oxide diblock copolymer (IUPAC name: poly(but-2-ene-1,4-diyl)-block-polyoxyethylene) and water, and the rheological behavior of the solution. The degree of polymerization of the polybutadiene and polyethylene oxide blocks is 37 and 45, respectively. The diblock copolymer concentration was limited to be \( \le\)2.5 wt% to avoid phase separation. Small X-ray scattering revealed that the diblock copolymer self-assembles in worm-like micelles with a diameter of ∼ 12 nm. This system does not closely follow the rheological behavior of worm-like micelle solutions made of typical surfactants. The system steadily shear thins reaching very low viscosity values at large shear rates, however there are not shear-thickening peaks. In thixotropic loops, the micellar solution does not present hysteresis. The viscoelastic spectra do not follow the Maxwell model at low and intermediate frequencies. This uncommon behavior for a worm-like micellar system is explained by the slow dynamics of the self-assembly. The extremely high hydrophobicity of the polybutadiene block does not allow any micellar rearrangement

Graphical abstract

Keywords

Soft Matter: Self-organisation and Supramolecular Assemblies 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Brisa Arenas-Gómez
    • 1
    • 2
  • Marko Vinceković
    • 1
  • Cristina Garza
    • 1
  • Rolando Castillo
    • 1
  1. 1.Instituto de FísicaUniversidad Nacional Autónoma de MéxicoMéxico, D. F.México
  2. 2.Departamento de FísicaCentro de Investigación y de Estudios Avanzados del IPNMéxico, D. F.México

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