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Related Experiment Videos

Shear-induced overaging in a polymer glass.

Matthew L Wallace1, Béla Joós

  • 1Ottawa-Carleton Institute for Physics, University of Ottawa Campus, Ottawa, Ontario, Canada K1N 6N5.

Physical Review Letters
|February 21, 2006
PubMed
Summary

Transient shear strain causes overaging, a slowdown in glass relaxation modes. This phenomenon, observed in polymer melts, shows relaxation times increasing exponentially with deformation, distinct from standard aging.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Polymer physics

Background:

  • Glasses exhibit complex relaxation dynamics.
  • Transient shear strain can alter these dynamics.
  • Overaging describes a slowdown in relaxation modes.

Purpose of the Study:

  • To investigate the phenomenon of overaging in supercooled polymer melts.
  • To understand the impact of transient shear strain on relaxation times.
  • To differentiate overaging from standard aging processes.

Main Methods:

  • Simulations of a supercooled polymer melt.
  • Imposition of instantaneous shear deformations.
  • Analysis of relaxation time distributions and system properties.

Main Results:

  • Overaging was reproduced in simulations.
  • Relaxation times increased exponentially with deformation in the plastic regime.
  • Significant changes in relaxation time distribution were observed.
  • Increases in pressure, bond-orientational order, and inherent structure energy were noted.

Conclusions:

  • Overaging is a distinct phenomenon from standard aging.
  • The magnitude of shear deformation influences overaging effects.
  • The transition from elastic to plastic deformation suggests a connection to jammed state physics.

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