Sarvestani, Alireza S. (2010) Nonlinear Rheology of Unentangled Polymer Melts Reinforced with High Concentration of Rigid Nanoparticles. Nanoscale Research Letters, 5 (4). pp. 791-794. ISSN 1931-7573 (Print) 1556-276X (Online)
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Official URL: http://www.springerlink.com/content/t20n7316012376...
A scaling model is presented to analyze the nonlinear rheology of unentangled polymer melts filled with high concentration of small spherical particles. Assuming the majority of chains to be reversibly adsorbed to the surface of the particles, we show that the emergence of nonlinearity in the viscoelastic response of the composite system subjected to a 2D shear flow results from stretching of the adsorbed chains and increasing desorption rate of the adsorbed segments due to the imposed deformation. The steady-state shear viscosity of the mixture in nonlinear shear thinning regime follows the power law where is the applied shear rate. At large strain amplitude γ0, the storage and loss moduli in strain sweep tests scale as and respectively.
|Uncontrolled Keywords:||Rheology - Polymer nanocomposites - Melt - Scaling relations - Nonlinearity|
|Subjects:||Material Science > Functional and hybrid materials|
Material Science > Nanofabrication processes and tools
Engineering > Nanotechnology applications in mechanical engineering
|Deposited On:||15 Jul 2010 10:11|
|Last Modified:||15 Jul 2010 10:11|
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