Rheologica Acta

, Volume 47, Issue 9, pp 989–997 | Cite as

Elasticity and dynamics of particle gels in non-Newtonian melts

  • Giovanni Romeo
  • Giovanni Filippone
  • Alberto Fernández-Nieves
  • Pietro Russo
  • Domenico Acierno
Original Contribution

Abstract

We investigate the relation between the structure and the viscoelastic behavior of a model polymer nanocomposite system based on a mixture of titanium dioxide (TiO2) nanoparticles and polypropylene. Above a critical volume fraction, Φ c, the elasticity of the hybrids dramatically increases, and the frequency dependence of the elastic and viscous moduli reflects the superposition of the independent responses of the suspending polymer melt and of an elastic particle network. In addition, the elasticity of the hybrids shows critical behavior around Φ c. We interpret these observations by hypothesizing the formation of a transient network, which forms due to crowding of particle clusters. Consistent with this interpretation, we find a long-time, Φ-dependent, structural relaxation, which emphasizes the transient character of the structure formed by the particle clusters. For times below this characteristic relaxation time, the elasticity of the network is Φ-independent and reminiscent of glassy behavior, with the elastic modulus, G, scaling with frequency, ω, as Gω 0.3. We expect that our analysis will be useful for understanding the behavior of other complex fluids where the elasticity of the components could be superimposed.

Keywords

Linear viscoelasticity Polymer nanohybrid Filler network 

Notes

Acknowledgements

The authors acknowledge Prof. Dave Weitz for useful discussions. G. R. also gratefully acknowledges his hospitality at Harvard University. A.F-N. thanks Ministerio de Educacion y Ciencia (DPI2008-06624-C03-03) and University of Almeria (leave of absence).

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Giovanni Romeo
    • 1
  • Giovanni Filippone
    • 1
  • Alberto Fernández-Nieves
    • 2
  • Pietro Russo
    • 3
  • Domenico Acierno
    • 1
  1. 1.Department of Materials Engineering and ProductionUniversity of Napoli Federico IINaplesItaly
  2. 2.School of PhysicsGeorgia Institute of TechnologyAtlantaUSA
  3. 3.Institute of Chemistry and Technology of PolymersNational Council of ResearchNaplesItaly

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