Rheologica Acta

, Volume 42, Issue 1, pp 47–55

A thermodynamic approach to the rheology of highly interactive filler-polymer mixtures. Part II. Comparison with polystyrene/nanosilica mixtures

Original Contribution

DOI: 10.1007/s00397-002-0253-z

Cite this article as:
Havet, G. & Isayev, A.I. Rheol Acta (2003) 42: 47. doi:10.1007/s00397-002-0253-z

Abstract.

The dynamic properties as a function of frequency and strain amplitude, steady-state viscosity as a function of shear rate, and transient shear stresses at startup and cessation of shear flow of polystyrene (PS)/fumed silica mixtures of various concentrations were investigated. An abrupt change in the viscoelastic properties was noticed at a concentration above 1% by volume. Observations by means of scanning electron microscopy (SEM) indicate the presence of a three-dimensional network through the bridging of filler particles by the adsorbed polymer. The viscoelastic behavior is simulated utilizing a theory proposed in Part I (Havet and Isayev 2001) based on a double network created by the entangled polymer matrix and the adsorbed polymer with filler concentration taken into account through the bridging density of polymer-filler interactions and a hydrodynamic reinforcement. The steps taken for determining the model parameters required to carry out the simulation are described. The major features of the rheological behavior of highly interactive polymer-filler mixtures are captured qualitatively and in some cases, quantitatively predicted.

Keywords.

RheologyNanoparticlesTheoryExperimentPolymerMixturesAdsorbed layerFumed silicaDynamic propertiesFlow curve

Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Institute of Polymer Engineering. The University of Akron, Akron, Ohio 44325–0301