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Elasticity and dynamics of particle gels in non-Newtonian melts

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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 G′∼ω 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.

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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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Authors and Affiliations

  1. Department of Materials Engineering and Production, University of Napoli Federico II, P.le Tecchio, 80, 80125, Naples, Italy

    Giovanni Romeo, Giovanni Filippone & Domenico Acierno

  2. School of Physics, Georgia Institute of Technology, Atlanta, GA, 30332, USA

    Alberto Fernández-Nieves

  3. Institute of Chemistry and Technology of Polymers, National Council of Research, Via Campi Flegrei 34, Pozzuoli, 80078, Naples, Italy

    Pietro Russo

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  1. Giovanni Romeo
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  2. Giovanni Filippone
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  3. Alberto Fernández-Nieves
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  4. Pietro Russo
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  5. Domenico Acierno
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Correspondence to Giovanni Romeo.

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Romeo, G., Filippone, G., Fernández-Nieves, A. et al. Elasticity and dynamics of particle gels in non-Newtonian melts. Rheol Acta 47, 989–997 (2008). https://doi.org/10.1007/s00397-008-0291-2

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  • DOI: https://doi.org/10.1007/s00397-008-0291-2

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