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August 1995 - June 2000
University of Akron, Akron, United States
Field of study
- Polymer science and engineering
Rheology and viscoelastic behavior of polystyrene (PS)/silica microcomposites and nanocomposites were studied. The apparent viscosity, transient shear stress growth after startup shear flow and stress relaxation after cessation of flow at various shear rates, the complex dynamic viscosity, the storage and loss moduli at small and large strain ampli...
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 concen...
The rheological behavior of highly interactive filler-polymer mixtures is simulated utilizing a double network created by the entangled polymer matrix and the adsorbed polymer. Both networks are represented by a nonlinear viscoelastic constitutive equation. The dependence of rheological properties on filler concentration is taken into account throu...
The transient shear stress behavior, storage and loss moduli for various silica/PS mixtures are studied as a function of size, shape and volume concentration of the finer. A comparison of the rheological data for mixtures at all volume concentrations of various silica fillers ranging from nanoscale to microscale size is presented. Fundamental diffe...