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Ehssan Nazockdast, Hossein Nazockdast
Rheological Modeling of Polymer/layered silicate Nanocomposites
Appl. Rheol. 21:2 (2011) 25434 (11 pages)
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This work takes a phenomenological approach to modeling the rheology of polymer/clay nanocomposites in (shear rate)
γ ≤ 1 / s
based on experimental observations [10]. The total stress was divided to three contributions: Matrix stress, σM,
inter-particle
(matrix/particle) stress, σP,
and hydrodynamic stress σH. Based on the superposition of complex viscosities, η*, plotted against
strain rate amplitude, γ0ω,
at different nonlinear strain amplitudes, a modified Bingham-type constitutive equation proposed
by Doiraswamy et. al [16] was used to model σM+σP
while σH was modeled by using constitutive equation proposed by
Lipscomb et. al [25] for ellipsoidal particles. The comparison between experimental and modeling results showed that steady
hydrodynamic stress in simple shear flows scales with complex viscosities in oscillatory experiments when compared at
γ = γ0ω.
On the basis of this observation, the network-like behavior of the polymer nanocomposite was attributed to retarded
chain dynamics as a result of polymer/clay interactions. In order to take into account the thixotropic behavior of network
structure, the constitutive equation proposed by Coussot [18] was employed for modeling σM+σP.
Both Coussot and Doraiswamy equations gave a reasonable
quantitative prediction of transient stress in simple shear flow up to shear rates as
high as γ = 0.1 / s.
► Cite this publication as follows:
Nazockdast E, Nazockdast H: Rheological Modeling of Polymer/layered silicate Nanocomposites, Appl. Rheol. 21 (2011) 25434.
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