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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Large amplitude oscillatory shear (LAOS) induces unique lamellar orientation in polymer melts, differing from steady shear flow. This method promotes plate-like nuclei formation oriented in the shear gradient direction.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Rheology

Background:

  • Crystallizing polymer melts exhibit complex behavior under shear.
  • Steady shear typically induces flow-orientation in polymer crystals.
  • Understanding shear effects on polymer crystallization is crucial for material properties.

Purpose of the Study:

  • To investigate the effect of large amplitude oscillatory shear (LAOS) on polymer melt crystallization.
  • To compare LAOS-induced orientation with steady shear orientation.
  • To characterize the kinetics of crystal orientation relaxation.

Main Methods:

  • Applying large amplitude oscillatory shear (LAOS) to crystallizing polymer melts.
  • Analyzing lamellar orientation using microscopy and scattering techniques.
  • Studying crystal orientation relaxation kinetics via temperature-dependent annealing experiments.

Main Results:

  • LAOS resulted in lamellar orientation along the shear gradient direction, unlike steady shear's flow-orientation.
  • LAOS promoted the formation of plate-like nuclei with normals aligned in the gradient direction.
  • Crystal orientation relaxation followed an Arrhenius temperature dependence with an activation energy of approximately 226 kJ/mol.

Conclusions:

  • LAOS provides a distinct mechanism for controlling polymer crystal morphology and orientation.
  • The shear gradient orientation is attributed to enhanced plate-like nucleus formation.
  • The relaxation dynamics are governed by thermally activated processes.