Shear-induced overaging in a polymer glass

Details Shear-induced overaging in a polymer glass Shear-induced overaging in a polymer glass

2005-06-28

arxiv.org/abs/cond-mat/0506737v1

Physics

Condensed Matter

Soft Condensed Matter

5 pages including 5 figures

Scientific paper

10.1103/PhysRevLett.96.025501

A phenomenon recently coined as ``overaging'' implies a slowdown in the collective (slow) relaxation modes of a glass when a transient shear strain is imposed. We are able to reproduce this behavior in simulations of a supercooled polymer melt by imposing instantaneous shear deformations. The increases in relaxation times $\Delta \tau_{1/2}$ rise rapidly with deformation, becoming exponential in the plastic regime. This ``overaging'' is distinct from standard aging. We find increases in pressure, bond-orientational order and in the average energy of the inherent structures ($$) of the system, all dependent on the size of the deformation. The observed change in behavior from elastic to plastic deformation suggests a link to the physics of the ``jammed state''

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