Heterogeneous Segmental Dynamics during Creep and Constant Strain Rate Deformations of Rod-Containing Polymer Nanocomposites

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Gregory N. Toepperwein

2012

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  • Theoretical, and simulation studies have examined molecular mobility under deformation for different classes of materials, ranging from colloidal suspensions to polymeric glasses. While such studies indicate that dynamic heterogeneity, one of the hallmarks of glasses, decreases with the onset of flow, less is known about the effects of stress on polymer nanocomposites, whose mechanical and rheological properties can be significantly different from those of pure polymers
  • Segment displacements during postyield deformation are found to agree with a simple diffusional model across 2 orders of magnitude in strain rate for both pure polymer and nanocomposite systems

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