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March 15, 2001The Journal of Chemical Physics

Shear response of layered silicate nanocomposites

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Authors

RKRamanan KrishnamoortiJRJiaxiang RenASAdriana S. Silva

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Overview

Rheological analysis reveals enhanced shear-thinning and preserved elasticity in layered silicate nanocomposites, indicating that filler orientation facilitates molten polymer processing.

Key Points

  • To elucidate how highly anisotropic, nanometer-thick silicate layers alter the linear and nonlinear melt-state viscoelastic flow properties of intercalated polymer nanocomposites.
  • Characterized the linear and nonlinear melt-state viscoelasticity of a series of intercalated layered silicate polymer nanocomposites.
  • Measured steady shear viscosity across a spectrum of shear rates and evaluated melt elasticity using the first normal stress difference under constant shear stress.
  • Layered silicate nanocomposites demonstrated enhanced shear-thinning across all tested shear rates, with high-shear-rate viscosity matching that of the unfilled polymer regardless of silicate loading.
  • Melt elasticity, quantified via first normal stress difference at constant shear stress, remained completely independent of silicate concentration and identical to the neat polymer due to flow-induced alignment of the anisotropic silicate sheets.

Cite This Study

Krishnamoorti et al. (2001) studied this question.

synapsesocial.com/papers/6a9569ec2dd91e6efbf230ebhttps://doi.org/10.1063/1.1345908
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