TY - JOUR
T1 - Mechanistic model for deformation of polymer nanocomposite melts under large amplitude shear
AU - Senses, Erkan
AU - Akcora, Pinar
PY - 2013/5/1
Y1 - 2013/5/1
N2 - We report the mechanical response of a model nanocomposite system of poly(styrene) (PS)-silica to large-amplitude oscillatory shear deformations. Nonlinear behavior of PS nanocomposites is discussed with the changes in particle dispersion upon deformation to provide a complete physical picture of their mechanical properties. The elastic stresses for the particle and polymer are resolved by decomposing the total stress into its purely elastic and viscous components for composites at different strain levels within a cycle of deformation. We propose a mechanistic model which captures the deformation of particles and polymer networks at small and large strains, respectively. We show, for the first time, that chain stretching in a polymer nanocomposite obtained in large amplitude oscillatory deformation is in good agreement with the nonlinear chain deformation theory of polymeric networks.
AB - We report the mechanical response of a model nanocomposite system of poly(styrene) (PS)-silica to large-amplitude oscillatory shear deformations. Nonlinear behavior of PS nanocomposites is discussed with the changes in particle dispersion upon deformation to provide a complete physical picture of their mechanical properties. The elastic stresses for the particle and polymer are resolved by decomposing the total stress into its purely elastic and viscous components for composites at different strain levels within a cycle of deformation. We propose a mechanistic model which captures the deformation of particles and polymer networks at small and large strains, respectively. We show, for the first time, that chain stretching in a polymer nanocomposite obtained in large amplitude oscillatory deformation is in good agreement with the nonlinear chain deformation theory of polymeric networks.
KW - deformation
KW - nanocomposites
KW - networks
KW - nonlinear rheology
KW - poly(styrene)- silica
KW - polymer nanocomposite
KW - polystyrene
KW - stiffness
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U2 - 10.1002/polb.23247
DO - 10.1002/polb.23247
M3 - Article
AN - SCOPUS:84874901604
SN - 0887-6266
VL - 51
SP - 764
EP - 771
JO - Journal of Polymer Science, Part B: Polymer Physics
JF - Journal of Polymer Science, Part B: Polymer Physics
IS - 9
ER -