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Issue 2, 2010
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Heterogeneous dynamics during deformation of a polymer glass

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Abstract

The origins of molecular mobility in polymer glasses, particularly under deformation, are not well understood. A concerted experimental and computational approach is adopted to examine the segmental motion of a polymeric glass undergoing creep and constant strain rate deformations. Through a combination of molecular dynamics simulations and optical photobleaching experiments we are able to directly probe how dynamic heterogeneity evolves during deformation. Two distinct regimes emerge from our analysis; early in the deformation, the dynamics of the glass are strongly heterogeneous, as evidenced by the spectrum of relaxation times measured experimentally and the participation ratio of the atomic non-affine displacements measured computationally. After the onset of flow, the dynamics become significantly more homogeneous, and the participation ratio increases considerably.

Graphical abstract: Heterogeneous dynamics during deformation of a polymer glass

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Article information


Submitted
23 Jun 2009
Accepted
30 Sep 2009
First published
05 Nov 2009

Soft Matter, 2010,6, 287-291
Article type
Paper

Heterogeneous dynamics during deformation of a polymer glass

R. A. Riggleman, H. Lee, M. D. Ediger and J. J. de Pablo, Soft Matter, 2010, 6, 287
DOI: 10.1039/B912288E

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